Dictyonema hirsutum Moncada & Lücking  

Mycobank MB 517762

Thallus terricolous or between bryophytes, foliose, composed of semicircular to flabellate lobes 0.5–1 cm diam. wide and 200–300 mm thick, with thickened, involute margins; upper surface densely hirstute and covered with obliquely oriented, white trichomes 0.3–0.5 mm long and 20–30 µm thick at the base, composed of densely packed parallel hyphae; zone close to the lobe margin usually glabrous and olive-green, surface otherwise white; lower surface ecorticate, finely felty-byssoid, mottled pale brownish to bluish grey. Thallus in section with upper corticiform layer composed of loosely packed, intricate, 3–4 µm thick, colourless hyphae, irregular photobiont layer with groups of cyanobacterial cells wrapped in a dense, partially paraplectenchymatous, hyphal sheath, and thin medulla of loosely woven hyphae also forming the lower thallus surface; clamps not observed. Photobiont a chroococcoid morph of Rhizonema (Lücking et al., 2009), cells in groups of 4–8, groups 20–40 mm diam., individual cells ovoid-ellipsoid, 10–13 x 6–10 mm, olive green. Basidiocarps on lower side, forming pieces of flat crust, each 1–3 mm in diam.; hymenophore attached by basal layer to lower side of thallus lobes, beige; margin slightly involute when dry, pale beige to white. Basal layer byssoid, composed of loosely woven, 4–5 mm thick hyphae, 200–300 mm high, colourless; subhymenial layer composed of densely woven, short-celled hyphae, 50–90 mm high, colourless; hymenium composed of densely arranged, palisade-like, 30–40 x 4–5 mm, slightly clavate basidioles, colourless, non-amyloid. Basidiospores not observed.