Research Article |
Corresponding author: Shah Hussain ( shahpk85@gmail.com ) Academic editor: Maria-Alice Neves
© 2018 Shah Hussain, Habib Ahmad, Sadiq Ullah, Najam-Ul-Sehar Afshan, Donald H. Pfister, Hassan Sher, Haidar Ali, Abdul N. Khalid.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Hussain S, Ahmad H, Ullah S, Afshan N, Pfister DH, Sher H, Ali H, Khalid AN (2018) The genus Parasola in Pakistan with the description of two new species. MycoKeys 30: 41-60. https://doi.org/10.3897/mycokeys.30.21430
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Parasola is a genus of small, veil-less coprinoid mushrooms in the family Psathyrellaceae (Agaricales). The genus is not well documented in Asia, specifically in Pakistan. In this study we describe two new species Parasola glabra and P. pseudolactea from Pakistan, based on morphological and molecular data. Phylogeny based on three DNA regions: nuc rDNA region encompassing the internal transcribed spacers 1 and 2 along with the 5.8S rDNA (ITS), nuc 28S rDNA D1-D2 domains (28S) and translation elongation factor 1α gene (TEF1α) show that the new taxa are clustered in a clade formed by the members of section Parasola of genus Parasola. Parasola glabra with grayish pileus, slightly depressed pileal disc, lamellae separated from the stipe by pseudocollarium, basidiospores 14.5–16.5 × 9.5–11.5 × 8.0–10.5 µm, in front view broadly ovoid to oblong, some with rhomboidal outline, in side view ellipsoid, with eccentric germ-pore of 1.5 µm diameter. Parasola pseudolactea with yellowish brown to dull brown pileus, disc indistinctly umbonate, lamellae free, pseudocollarium absent, basidiospores 13.5–14.5 × 10.5–12.0 × 9.5–10.5 µm, in face view rounded triangular to heart shaped, rarely ovoid to subglobose, in side view ellipsoid to oblong, with eccentric germ-pore of 1.5 µm diam. In addition to these new species, P. auricoma and P. lilatincta were also studied. Morphological descriptions for the new species and comparison with known Parasola species are provided. Our observations highlight the diversity of Parasola in northern Pakistan and further document the need for additional systematic focus on the region’s fungi.
Basidiomycota , diversity, Parasola , phylogeny, taxonomy
Parasola Redhead, Vilgalys & Hopple is a genus of small, veil-less coprinoid mushrooms belonging to family Psathyrellaceae Vilgalys, Moncalvo & Redhead (
Species of Parasola are divided into section Auricomi (Singer) D.J. Schaf. and section Parasola Redhead, Vilgalys & Hopple (previous references to Parasola section Glabri (Lange) D.J. Schaf. – see
Basidiospore shape and size are the main descriptive features for species identification in Parasola (
Previously, five species of this genus (Parasola auricoma (Pat.) Redhead, Vilgalys & Hopple, P. lilatincta (Bender & Uljé) Redhead, Vilgalys & Hopple, P. malakandensis S. Hussain, N. Afshan & H. Ahmad, P. plicatilis and P. setulosa (Berk. & Broome) Redhead, Vilgalys & Hopple) have been reported from Pakistan (
Specimens were collected from Malakand, Shangla and Swat districts of Khyber Pakhtunkhwa, Pakistan in summer seasons, 2013–2017. Basidiomata were photographed, tagged and field notes were made.
For anatomical studies slides were prepared in 5% aqueous KOH (w/v). Microscopic features such as size and shape of basidiospores, basidia, cheilocystidia, pleurocystidia and pileipellis were studied under a light microscope (MX4300H, Meiji Techo Co., Ltd., Japan) with at least 20 structures measured in each instance. Cheilocystidia and pleurocystidia were observed and measured by cutting the gill edge from the rest of gill to avoid confusion between the two types of cystidia. In the case of basidiospores, 50 spores were measured in face view and/or side view through 1000× magnification with a calibrated optical micrometer and measurements were rounded to the nearest 0.5 µm. Basidiospores measurements are presented as follows: length range × breadth range × width range. Q values were calculated as: Q1 = length divided by breadth; Q2 = length divided by width (
We extracted genomic DNA using the DNeasy Plant Mini Kit (Qiagen, Redwood City, California, USA.). We amplified nuc rDNA internal transcribed spacer (ITS) and 28S loci and translation elongation factor 1α gene (TEF1α) using the primer combinations ITS1F/ITS4; LR0R/LR5 and EF1-983F/EF1-1567R, respectively (
Voucher numbers, geographic origins and GenBank Accession numbers for the specimens included, in boldface are sequences produced in this study.
Species | Geographic origin | Voucher number | GenBank Accessions | ||
---|---|---|---|---|---|
ITS | 28S | TEF1α | |||
Parasola auricoma | Pakistan | LAH-SHP-P6 | KX212106 | KY461729 | MG587083 |
Pakistan | LAH-SHP-P7 | KY461721 | KY461730 | MG587084 | |
Pakistan | LAH-SHP-P11 | KY621802 | KY461728 | ||
Hungary | NL0268 | FM163186 | FM160723 | ||
Hungary | NL0087 | FM163185 | FM160724 | FM897236 | |
P. conopilus | Hungary | NL0465 | FM160686 | FM163223 | |
Hungary | NL0286 | FM160685 | FM163224 | ||
Hungary | NL0285 | FM160684 | FM163225 | KJ732832 | |
P. glabra | Pakistan | LAH-SHP-5 (Holotype) | KY461717 | KY621806 | KY461735 |
Pakistan | HUP-SHP-23 | KY461718 | KY621805 | ||
P. hercules | Netherlands | Uljé 1269 (L) | FM163190 | FM160719 | |
Netherlands | L146 holotype | HQ847027 | HQ847112 | ||
P. kuehneri | Netherlands | Uljé 904 (L) | FM163191 | FM160718 | |
P. lactea | Hungary | NL0466 | FM163192 | FM160717 | FM897241 |
Sweden | NL0095 | FM163188 | FM160721 | ||
Germany | NL0283 | FM163194 | FM160715 | FM897239 | |
Sweden | NL0288 | FM163193 | FM160716 | ||
Hungary | NL6601 | FM163187 | FM160722 | ||
USA | MICH232885 | KM403384 | |||
Latvia | KuP6.2.2.1 | KP698198 | |||
P. pseudolactea | Pakistan | HUP-SU-412 (Holotype) | KY461719 | KY621799 | KY461733 |
Pakistan | HUP-SU-413 | KY461720 | KY621800 | KY461734 | |
P. lilatincta | Pakistan | LAH-SHP-8 | KY461722 | KY461725 | KY461731 |
Pakistan | LAH-SHP-31 | KY461723 | KY461726 | KY461732 | |
Pakistan | LAH-SHP-12 | KY461724 | KY461727 | ||
Hungary | NL0683 | FM163203 | FM160706 | FM897231 | |
Hungary | NL0660 | FM163195 | FM160714 | FM897230 | |
Hungary | NL0472 | FM163199 | FM160709 | ||
Hungary | NL0667 | FM163198 | JQ045886 | ||
Pakistan | SH4 | KP886462 | |||
Pakistan | SHP2 | KP886463 | |||
Pakistan | SHP9 | KP886464 | |||
P. aff. lilatincta | Hungary | NL0086 | FM163204 | FM160705 | |
Sweden | NL0096 | FM163205 | FM160704 | ||
P. megasperma | Denmark | C 19683 | FM163206 | FM160703 | |
Sweden | NL1924 | FM163208 | FM160701 | FM897232 | |
P. malakandensis | Pakistan | LAH-SHP-17 | KU599827 | KU599830 | KU599832 |
Pakistan | HUP 17501 | KP738713 | KU599829 | KU599831 | |
P. misera | Hungary | NL0677 | FM160698 | FM163211 | FM897240 |
Hungary | NL0280 | FM160699 | FM163210 | ||
Hungary | NL0490 | FM163209 | FM160700 | ||
P. plicatilis | Sweden | NL0477 | FM163212 | FM160697 | FM897235 |
Hungary | NL0295 | FM163216 | FM160693 | FM897242 | |
P. plicatilis | Sweden | NL0097 | FM163215 | FM160694 | |
Hungary | NL0075 | FM163214 | FM160695 | ||
Hungary | NL0284 | FM163189 | FM160720 | ||
P. schroeteri | Netherlands | LBrier:1051999 | FM163219 | FM160690 | |
P. setulosa | Hungary | L32 | HQ847030 | HQ847115 | |
Parasola sp. | Norway | NL3167 | JN943136 | JQ045865 | |
Parasola sp. | Norway | NL3621 | JN943134 | JQ045875 | |
Parasola sp. | Hungary | NL4175 | HQ847025 | HQ847110 | |
Parasola sp. | Hungary | NL0287 | FM163218 | FM160691 | |
Parasola sp. | Hungary | NL2952 | HQ847028 | ||
Psathyrella candolleana | Hungary | NL2937 | FN396114 | FN396165 | FN396220 |
ITS, 28S and TEF1α sequences were aligned using BIOEDIT v 7.2.5 (
Sequence length varied from 631 bp (SHP-8) to 644 bp (SHP-11) for our 10 new ITS (ITS1-5.8S-ITS2) sequences and 1042 bp (SHP-12) to 1144 bp (SHP-8) for 10 28S sequences. The 7 TEF1a sequences generated for this study varied from 402 bp (SHP-5) to 502 bp (SU-412). The ITS dataset contained 52 taxa and 631 characters long after being trimmed (Trimming was done manually in BIOEDIT v 7.2.5). The combined ITS-28S dataset represented 47 taxa and 1892 characters long after being trimmed. Similarly, the combined ITS-28S-TEF1a dataset comprised 20 species and with 2890 nucleotides, after being trimmed.
The results of phylogenetic analyses of ITS, ITS-28S and combined ITS-28S-TEF1a datasets are summarized in Figures
Phylogeny of Parasola species based on 52 ITS sequences. Our sequences are indicated in boldface. Other sequences are from
Phylogeny of Parasola species based on 47 sequences of combined ITS-28S dataset. Our sequences are indicated in boldface. Other sequences are from
Using Bayesian and ML methods, P. auricoma, P. conopilus, P. setulosa and P. malakandensis were recovered as basal groups with strong support, collectively forming section Auricomi, whereas species of section Parasola fall in a single clade represented as gray highlighted, called ‘the crown Parasola’ clade (
Phylogeny of Parasola species based on 20 sequences of combined ITS-28S-TEF1α dataset. Our sequences are indicated in boldface. Other sequences are from
The diagnostic features of Parasola glabra are grayish pileus, deeply plicate towards margin; disc slightly depressed, strong reddish orange; lamellae free, separated from the stipe by pseudocollarium; basidiospores 14.5–16.5 × 9.5–11.5 × 8.0–10.5 µm, in front view broadly ovoid to oblong, some with rhomboidal outline, in side view ellipsoid, with eccentric germ-pore of 1.5 µm diam.
Pileus 20–30 mm diam, initially subglobose, later convex to hemispheric; at first smooth, without veil, the center glabrous at maturity, becoming deeply plicate towards the margin; light gray (2.5R 6/2) to moderate gray (7.5R 6/2); disc slightly depressed, strong reddish orange (7.5R 5/12). Lamellae free, fairly crowded, separated from the stipe by pseudocollarium, 0–2 lamellulae, regular, initially whitish, then dark brown becoming black at maturity, finally losing turgor and collapsing. Stipe 30–60 × 2–3 mm, central, equal, smooth, slightly sub-bulbous at the base, hollow, white, fragile, without annulus.
Basidiospores (13)14.5–16.5(18) × (7.5)9.5–11.5(15) × (9)8.0–10.5(11.5) µm, on average 15.8 × 10.9 × 10.1 µm, Q1 = 1.3–1.5, Q2 = 1.4–1.6, avQ = 1.4; in face view broadly ovoid to oblong, some with rhomboidal outline, in side view ellipsoid, germ-pore eccentric and upto 1.5 µm diam; wall upto 1.5 µm thick, dark brown to blackish in KOH. Basidia 28–41 × 10–13 µm, clavate to cylindrical, 4-spored, hyaline in KOH. Cheilocystidia 50–63 × 17–23 µm, oblong, ellipsoid, narrowly to broadly utriform, hyaline. Pleurocystidia 60–75 × 22–38 µm, clavate to broadly lageniform, hyaline. Pileipellis hymeniform, consisting of clavate cells 47–60 × 13–16 µm, bright yellow at the base in KOH. Clamp connections present mostly in the pileipellis and at the base of basidia. Sclerocystidia absent.
Saprotrophic, scattered under herbaceous plants on grass land. So far only known from the lowland of northern Pakistan. This species is, however, common in lowland northwest Pakistan.
Specific epithet ‘glabra’ refers to the glabrous cap found in species of section Parasola of the genus Parasola, where this species belongs.
PAKISTAN, Khyber Pakhtunkhwa Province, Malakand, Qaldara, 480 m alt., 28 May 2015, S. Hussain SHP23 (HUP SHP-23).
The distinguishing features of the new species P. glabra are: basidiospores broadly ovoid to oblong, some with rhomboidal outline in face view, ellipsoid in side view, on range 14.5–16.5 × 9.5–11.5 × 8.0–10.5 µm, pileus light gray to moderate gray but reddish orange at the disk, without sclerocystidia. Lacking sclerocystidia, P. glabra belongs in section Parasola. On basidiospore dimensions, it could be thought close to P. plicatilis and P. megasperma (P.D. Orton) Redhead, Vilgalys & Hopple but these are distinguishable on the basis of spores shape, length and breadth together and on the color of the cap disk. Using maximum likelihood phylogeny, these two species are clearly distinct from P. glabra and, based on ITS and 28S loci, the more closely related species are: P. hercules (Uljé & Bas) Redhead, Vilgalys & Hopple; P. kuehneri (Uljé & Bas) Redhead, Vilgalys & Hopple; P. lilatincta and P. schroeteri (P. Karst.) Redhead, Vilgalys & Hopple. The new species can be distinguished from these species on account of basidiospore morphology: among these species, P. hercules has the largest spore breadth (11.3–16.9 µm), followed by P. schroeteri (9–13 µm), P. glabra (9.5–11.5 µm), P. lilatincta (9–11.2 µm) and smallest spore breadth (5.5–8.4 µm) in P. kuehneri. On the basis of basidiospore length/breadth ratio (Q1), the new taxon P. glabra (Q1 = 1.3–1.5), can be easily distinguished from these species: in P. hercules (Q1 = 1.04–1.28), P. schroeteri (Q1 = 1.16–1.27), P. lilatincta (Q1 = 1.14–1.33) and P. kuehneri (Q1 = 1.12–1.28), respectively (
Characteristics distinguishing Parasola glabra and P. pseudolactea from the remaining species in section Parasola.
Taxa | Pileus diam; and pileus color | Stipe size | Basidiospores size, length/breadth (Q1), length/width (Q2) ratios | Basidiopores shape and germ-pore position | References |
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P. glabra | 20–30 mm diam, light-gray to moderate-gray | 30–60 × 2–3 mm | 15.8 × 10.9 × 10.1 µm; Q1 = 1.3–1.5, Q2 = 1.4–1.6, avQ = 1.4 | In face view broadly ovoid to oblong, some with rhomboidal outline, in side view ellipsoid; germ-pore eccentric, upto 1.5 µm diam. | Observed during this study. |
P. hercules | 15–20 mm diam, orange-brown to red-brown | 75 × 1.5 mm | 15.83 × 15.42 × 10.63 µm;Q1 = 1–1.15, Q2 = 1.4–1.5 | In face view rounded triangular to quadrangular, rarely subglobose to ovoid, in side view ellipsoid to amygdaliform; germ-pore eccentric, upto 2.7µm diam. |
|
P. kuehneri | 35 mm diam, dark light grayish-brown | 100 × 3 mm | 9.36 × 7.85 × 5.9 µm;Q1 = 1.1–1.2, Q2 = 1.4–1.6 | In face view ovoid to rounded triangular, rhomboid to mitriform, in side view amygdaliform; germ- pore eccentric, 1.5 µm diam. |
|
P. lactea | 15–23 mm diam, yellow-brown to dull red-brown | 140 × 3 mm | 10.73 × 8.81 × 6.73 μm; Q1 = 1.02–1.25, Q2 = 1.66–2.10 | In face view mostly broadly ovoid to subglobose, rarely angular to rounded triangular, in side view broadly ellipsoid to ellipsoid; germ-pore eccentric, upto 1.8 μm diam. |
|
P. pseudolactea | 15–25 mm diam, initially yellow-brown to dull-brown, moderate gray at maturity | 30–50 × 1 mm | 14.0 × 11.3 × 9.7 µm; Q1 = 1.3–1.5, Q2 = 1.4–1.5, avQ = 1.4 | In face view mostly rounded triangular to heart shape, rarely ovoid to subglobose, in side view ellipsoid to oblong, germ-pore eccentric, upto 1.5 µm diam. | Observed during this study |
P. lilatincta | 30–50 mm diam, dark reddish brown, not plicate | 70–100 ×2–4 mm | 14.4 × 10.8 × 9.2 µm; Q1 = 1.3–1.4, Q2 = 1.3–1.5 | In face view rounded triangular to quadrangular, in side view ellipsoid to amygdaliform; germ-pore eccentric, upto 2.5 µm diam. |
|
P. megasperma | 35 mm diam, chestnut-brown to red-brown or ochre-tawny | 50–100 × 1.5–3 mm | 16.5 × 10.66 × 8.5 μm; Q1 = 1.40–1.78, Q2 = 1.83–1.95 | In face view ellipsoid to broadly ellipsoid, rarely ovoid, in side view ellipsoid to subamygdaliform; germ-pore slightly eccentric, upto 2.3 µm diam. |
|
P. misera | 2–5 × 1–3 mm, tawny-orange to cinnamon-brown | 50 × 0.5 mm | 7.0–10.6 × 6.5–10.0 × 5.9–6.6 μm | In face view heart-shape to rounded triangular, irregularly globose, in side view ellipsoid; sometimes broader than long; germ-pore eccentric. |
|
P. plicatilis | 35 mm diam, yellow-brown to dull pinkish-brown | 30–70 × 0.5–3 mm | 12.41 × 8.21 × 7.14 μm; Q1 = 1.34–1.67, Q2 = 1.61–1.86 | In face view mostly leminiform-subhexagonal, rarely ovoid, in side view ellipsoid to subamygdaliform; germ-pore eccentric, 2.3 µm diam. |
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P. schroeteri | 20–30 mm diam, yellow-brown to grayish red-brown | 40–60 × 1 mm | 14.44 × 11.83 × 9.72 μm, Q1 = 1.16–1.27, Q2 = 1.46–1.68 | In the face view rounded triangular to subglobose, in side view ovoid to amygdaliform; germ-pore eccentric, upto 2.5 μm diam. |
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Pileus yellowish brown to dull brown, deeply plicate towards margin; disc subumbilicate, deep orange yellow; lamellae free, pseudocollarium absent; basidiospores 13.5–14.5 × 10.5–12.0 × 9.5–10.5 µm, in face view rounded triangular to heart shape, rarely ovoid to subglobose, in side view ellipsoid to oblong, with eccentric germ-pore of 1.5 µm diam; sclerocystidia absent.
Pileus 15–25 mm diam, initially obtusely conical, later becoming applanate and deeply plicate towards margin; yellowish brown to dull brown (10YR 6/4) when young, moderate gray (7.5R 6/2) on maturity; disk subumbilicate, deep orange-yellow (7.5YR 6/12). Lamellae free, 0–2 lamellulae, distant, pseudocollarium absent, initially dark gray, becoming blackish at maturity and finally losing turgor and collapsing. Stipe 30–50 × 1 mm, equal, smooth, grayish-brown, translucent, hollow, without annulus.
Basidiospores (12.0)13.5–15.0(16.0) × (9.5)10.5–12.0(13.0) × (7.5)9.5–10.5(12.0) µm, on average 14.0 × 11.3 × 9.7 µm, Q1 = 1.3–1.5, Q2 = 1.4–1.5, avQ = 1.4; in face view mostly rounded triangular to heart shaped, rarely ovoid to subglobose, in side view ellipsoid to oblong, with eccentric germ pore of 1–1.5 µm diam, dark to blackish in KOH. Basidia 24–31 × 8–12 µm, clavate to cylindrical, 4-spored. Cheilocystidia 55–70 × 22–29 µm, clavate, broadly clavate to broadly cylindrical. Pleurocystidia 44–67 × 19–23 µm, utriform to lageniform. Pileipellis hymeniform, consisting of clavate cells, 33–38 × 17–22 µm. Clamp connections present. Sclerocystidia absent.
Solitary to scattered on humus rich loamy soil, under Quercus incana. So far only known from northwest Pakistan.
The prefix “pseudo” means similar and “lactea” refers to the epithet of the species (Parasola lactea) that this species closely resembles. This species is known so far from low to moderate altitude mountains of northwest Pakistan.
PAKISTAN, Khyber Pakhtunkhwa Province, Shangla, 1480 m alt., 9 July 2014, Sadiq Ullah SU413 (HUP SU-413).
The new species belongs to Parasola section Parasola due to the absence of sclerocystida in the pileipellis. This species resembles Parasola lactea and is close to that species in the molecular phylograms. However, its spores are substantially larger, closer to P. schroeteri or P. hercules in size. The spores of P. pseudolactea are mostly rounded triangular, rarely ovoid to subglobose in face view and larger (14.0 × 11.3 × 9.7 µm), whereas those of P. lactea are mostly broadly ovoid to subglobose, rarely rounded triangular in face view, and comparatively smaller (10.73 × 8.81 × 6.73 μm). Other species similar to the new taxon are P. megasperma and P. plicatilis. Both these species share pileus color with P. pseudolactea. Lamellae of P. megasperma and P. plicatilis are separated from the stipe by a pseudocollarium, whereas in P. pseudolactea, a pseudocollarium is generally absent. Basidiospores are more ellipsoid rarely ovoid in face view and on average 16.5 × 10.66 × 8.5 μm in P. megasperma. Basidiospore shape is quite variable in P. plicatilis, in face view mostly limoniform-subhexagonal, rarely ovoid, in side view broadly ellipsoid, on average 12.41 × 8.21 × 7.14 μm (
Coprinus auricomus Pat., Tab. analyt. Fung. 5: 200, 1886.
Pileus 15–30 mm diam, convex to broadly convex, deeply plicate towards the margin, light grayish-brown (2.5YR 5/2) to grayish reddish-brown (2.5YR 3/2); disc indistinctly umbonate to umbilicate, dark reddish orange (7.5R 4/8) to grayish reddish orange (2.5YR 5/6). Lamellae free and remote, pseudocollarium absent, closed, initially concolorous with pileus, later on dark black, finally losing turgor and collapsing. Stipe 40–65 × 2–5 mm, equal, smooth, central, hollow, without annulus.
Basidiospores (10.5)12.5–13.5(15.0) × (8.0)8.5–9.5(10.0) × (7.0)8.0–9.0(10.0) μm, on average 12.9 × 9.0 × 8.5 μm, Q1 = 1.5–1.6, Q2 = 1.3–1.4, avQ = 1.5; in face view subcylindrical to ellipsoid or ovoid, in side view ellipsoidal to elliptical; with central germ-pore, 2–2.5 μm diam, wall 1.5 µm thick, strong reddish-brown to blackish in KOH. Basidia 30–38 × 7–11 μm, clavate to subcylindrical, 2- or 4-spored. Cheliocystidia 33–45 × 12–25 μm, subclavate to subglobose, abundant. Pleurocystidia 30–40 × 11–15 μm, cylindrical to clavate, pale brown at the base, rare. Sclerocystidia 90–170 × 4–7 μm, dark brown, with acute apex and bulbous base, wall 1.5–2 μm thick. Clamp connection present.
Pakistan, Khyber Pakhtunkhwa Province, Malakand, Kharkai, alt. 460 m, scattered in grassland under herbaceous plants, 10 August 2014, S. Hussain SHP6 (LAH-SHP-6), 10 August 2014, S. Hussain SHP7 (LAH-SHP-7), Malakand, Qaldara 10 August 2014, S. Hussain SHP11 (LAH-SHP-11); Khyber Pukhtunkhwa Province, Swat, Kanju Township, alt. 1023 m, 27 July 2017, S. Hussain SHP34 (SWAT SHP-34).
Coprinus lilatinctus Bender & Uljé, Persoonia 16: 373, 1997.
Pileus 20–30 mm diam, hemispheric to pulvinate, smooth, deeply plicate towards margin, yellow brown (2.5R 9/2–5R 9/2) to grayish red brown (2.5R 7/2–5R 7/2); disc slightly depressed, brilliant orange (2.5YR 8/12 – 5YR 8/12) to strong orange (2.5YR 6/12–5YR 6/12). Lamellae free, separated from the stipe by pseudocollarium, distant, lamellae edge blackish while faces initially concolorous with the pileus but later on black and finally losing turgor and collapsing. Stipe 40–60 × 1 mm, equal, smooth, white, fragile, without annulus with slightly sub-bulbous base.
Basidiospores (12)13–14.5(15.5) × (11.5)12–12.5(13.5) × (6.0)8.5–11(13.5) μm, on average 14.5 × 12.5 × 9.9 μm, Q1 = 1.1–1.2, Q2 = 1.2–1.5, avQ = 1.3; in the face view rounded triangular to subglobose, in side view ovoid to amygdaliform, with eccentric germ-pore of 2–2.5 μm diam; wall upto 2 µm thick, dark brown in KOH. Basidia 17–22 × 6–9 μm, 4-spored, cylindrical to clavate, hyaline in KOH. Cheilocystidia 25–29 × 23–26 μm, rounded to globose, rare. Pleurocystidia 34–40 × 11–14 μm, cylindrical to subclavate. Pileipellis of clavate cells, 33–37 × 9–12 μm, with rounded apex, bright yellow at the base. Clamp connections present in most of the tissues. Sclerocystidia absent.
PAKISTAN, Khyber Pakhtunkhwa Province, Malakand, Qaldara, alt. 430 m, scattered under herbaceous plants, 11 August 2014, S. Hussain SHP-8, SHP-31, SHP-12 (LAH SHP-8; LAH SHP-31; LAH SHP-12); Khyber Pakhtunkhwa Province, Swat, Kanju Township, alt. 1023 m, on road trails, 27 July 2017, S. Hussain SHP35 (SWAT SHP-35).
The incorporation of molecular phylogenetics has significantly benefited the systematic and taxonomic studies of coprinoid mushrooms. These mushrooms are deliquescent or, at least, have morphological characters like gill cystidia, coloration and surface features that are quickly changed during basidioma maturation. So morphology based taxonomy of coprinoid mushrooms is always a difficult task for mushroom biologists. In the present study two new species of mushroom genus Parasola are described from Pakistan, based on morphological and molecular data.
On account of absence of sclerocystidia in the pileipellis, both the new species P. glabra and P. pseudolactea belong to section Parasola of genus Parasola. Parasola glabra with light gray to moderate gray pileus was collected in Malakand region of Pakistan. This region is rich in diversity of Parasola species (
Similarly, the second new species P. pseudolactea in this study was collected in Shangla district, Khyber Pakhtunkhwa province of Pakistan. This species with yellow brown to dull brown pileus, basidiospores mostly rounded triangular to heart shape, was found in a Quercus forest. The species most closely related to P. pseudolactea on the basis of basidiospore morphology is P. lactea. Basidiospores are mostly rounded triangular to heart shape, rarely ovoid to subglobose in face view in P. pseudolactea; while spores are ovoid to subglobose, rarely rounded triangular in face view in P. lactea. A poorly described species P. subprona (Cleland) J.A. Simpson & Grgur. with elliptical basidiospores (15 × 8 µm) can be differentiated from both the new species on account of central germ-pore (
It is concluded form this study that low altitude mountains of northern Khyber Pakhtunkhwa Province of Pakistan are rich in the diversity of Parasola and other coprinoid mushrooms.
We greatly acknowledge Derek J. Schafer (UK) and Laszlo G. Nagy (Synthetic and Systems Biology Unit, Institute of Biochemistry, BRC, Szeged, Hungary) for the critical review of the manuscript. Financial support for this study was provided by the Higher Education Commission of Pakistan under International Research Support Initiative Program (IRSIP). Molecular work was carried out in Molecular Lab, Department of Organismic and Evolutionary Biology, Harvard University.