Morphology of Biatora alnetorum. A Habit of lichen thallus with apothecia and soralia in herbarium specimen from 1999 (Tønsberg 27500, BG) B, C section through apothecium (Tønsberg 24077, BG), B showing pigmentation in bright-field illumination and C showing crystals in the proper exciple in cross-polarised light D thallus with soralia in herbarium specimen from 2000 (Tønsberg 28771a, BG) E soralium with soredia in cross-polarised light (Tønsberg 28771a, BG). Scale bars: 0.5 mm (A), 100 µm (B, C), 0.5 mm (D), 50 µm (E).