Mazaedium well-developed, black, sometimes only slightly projecting over the thalline margin but often extending further. Excipulum 10–25 µm laterally, sometimes thinner or absent below, of dark brown, sparingly branched and interwoven hyphae, 1.5–2 µm diam. halfway the height of the ascomata, densely inspersed with minute colourless crystals dissolving in K (observed in polarized light), of hyaline hyphae 1.5–2 µm diam. Ascomata very rare, sessile, short cylindrical to conical, 0.5–1 mm diam., 0.4–0.6 mm high (excluding the mass of ascospores), 1–1.5(–2) times as wide as high. Prothallus brown, byssoid, 1–4(–5) mm wide. Sporodochial conidia hyaline, smooth to slightly roughened, 0–1-septate, with rounded or truncate apices, simple conidia ellipsoid to oblong, rarely spherical, (4–)4.5–6.5(–8) × (3–)3–4(–5), l/b ratio 1.3–1.9 (n=60), 1–septate conidia often distinctly constricted at the septum, (6–)7–11.5(–15) × (3–)3.5–4.5(–5) µm, l/b ratio 1.9–2.9 (n=70) (for a detailed description of the conidiogenesis see Hawksworth et al. which are white, cream or sometimes with a pinkish or orange tinge, usually fading to white in the herbarium. James (K!–holotype).ĭescription: Thallus crustose, superficial, felty, pale greyish or rarely creamy or bluish white, ecorticate, thin, up to 0.3 mm thick hyphae irregularly branched, hyaline, mainly 1.5–2 µm diam., forming numerous convex to subglobose sporodochia 0.4–1 mm diam. Kerry, Killarney, Eagles Nest, on Cresponea premnea in dry recess of ancient Quercus, 1966, P.
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