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Fissurina subcomparimuralis Common & Lücking
Nomenclature
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Family: GraphidaceaeGenus: Fissurina
SUMMARY
Mycobank MB 517773
Thallus corticolous, 1–2 cm diam., 30–50 µm thick, continuous; surface smooth, yellowish-brown to olive-brown. Thallus in section with prosoplectenchymatous upper cortex, irregular algal layer and scattered clusters of crystals. Lirellae straight to curved, unbranched to sparsely branched, erumpent, fissurine, with complete thalline margin, 1–3 mm long, 0.2–0.25 mm wide, 0.12–0.15 mm high; disc concealed; labia conspicuous but not thickened, greyish black to brown-black below corticate thalline margin; thalline margin olive-brown. Excipulum entire, brown-black, 20–40 µm wide; covered by corticate algiferous thallus including clusters of crystals; hypothecium prosoplectenchymatous, 5–10 µm high, colourless to pale yellowish; hymenium 70–90 µm high, colourless, clear; epithecium granulose, 5–10 µm high, grey-brown. Paraphyses unbranched, glabrous; periphysoids present, apically spinulose; asci fusiform, 70–80 x 15–20 µm. Ascospores 8 per ascus, ellipsoid, muriform with 5–7 x 1–3 septa, 15–25 x 6–8 µm (including 1–1.5 µm thick wall), 2.5–3 times as long as wide, with x trypethelioid septa and lumina, colourless, I–. Secondary chemistry: no substances detected by TLC.