Microglossum fuscorubens sensu Moingeon & Moingeon 2004  

A tall largely ferruginous (rust coloured) with potential hints of pink, crimson, orange, or yellow, smooth, hairless earthtongue, with olive-yellow or concolorous (the same coloured) stipe, growing usually in small clumps. Hymenium usually occupying more than the upper half of the ascocarp, and slightly singly grooved vertically.

Ascocarps (30-) 70-90 mm high, tongue-like, clavate (club-shaped), stipitate (with stipe). Hymenium (surface home to spore-bearing structures) 30-50 × 10 mm, clavate (club-shaped), attenuating at the tip, slightly vertically grooved, glabrous (smooth and hairless), naked, bright pink, crimson, bright orange to red-rusty yellow. Hymenium occupying more than the upper half of the ascocarp. Hymenium and stipe well differentiated but without a vallecula (clear collar separating the upper and lower parts). Stipe 20-40 mm, cylindrical, if slightly wider at the top, glabrous, olive-yellow or concolorous to subconcolourous with hymenium, whitish in the centre. Asci (80-) 100-130 x (7-) 8-9 (-12) μm, 8-spored, clavate (club-shaped), biseriate (arranged in two rows) above, uniseriate (arranged in a single row) below, the pore bluing in Melzer’s reagent. Ascospores: (18-) 20-21 (-23) x (4-) 5-6 μm, oblong to fusiform (tapering at both ends), hyaline (glassy/translucent), with 4-7 lipid bodies, often with 2 smaller central lipid bodies, non-septate. Paraphyses 1 μm wide, filiform (thread-like), straight, branched in basal part, with apical cells wider (3-5 μm).

Adapted and combined from: - Boudier (1907). "Histoire et classification des Discomycètes d'Europe";

- & Moingeon et al. (2004). "Contributions à l’étude des Geoglossaceae à spores hyalines." Miscellanea Mycologica 80-81.