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Eremithallus marusae R. Miranda, Gaya & Lücking
Nomenclature
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Genus: Eremithallus
SUMMARY
Mycobank MB 517767
Thallus superficially delimited by yellowish-grey color and partially a thin, brown-black prothallus, but proper thallus structures (cortex, algal layer, medulla) absent; photobiont a species of Trentepohlia, cells 7–12 × 7–9 µm, located within the periderm cells of the tree bark and connected to the base of the apothecia by hyaline fungal hyphae. Apothecia erumpent from periderm and finally almost appearing sessile, rounded, up to 1 mm diam., with brown-black disc and irregular marginal, grey-white lobules (remnants of the initially covering periderm). Proper excipulum 20–40 µm broad, red-brown, lateral towards the hymenium with anastomosing periphysoids and paraphysoids. Hymenium 55–70 µm high, non-amyloid, composed of unbranched to rarely anastomosing paraphyses; asci ellipsoid to clavate, 55–65 × 15–18 µm, non-amyloid, with thick tholus and distinct ocular chamber when young (probably fissitunicate). Ascospores 8 per ascus, ellipsoid, 1-septate, 15–20 × 6–8 µm, hyaline, non-amyloid, constricted at septum when mature. Secondary chemistry: no substances detected by TLC.