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Megalospora austropacifica Lumbsch, Naikatini & Lücking
Nomenclature
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Family: MegalosporaceaeGenus: Megalospora
SUMMARY
Mycobank MB 517796
Thallus yellowish grey to whitish grey, glossy, thick, slightly rugulose to continuous, often irregularly cracked, sometimes with small papillae containing conidiomata. Isidia and soredia absent. Apothecia common, orbicular, up to 4.5 mm in diam., up to 1 mm high, disc concave when young, becoming flat to slightly convex, orange-brown to red-brown, blackish towards the margins, glossy, epruinose. Margin prominent, thick, inner part (proper exciple) yellowish brown to pale brown, matt, epruinose, outer part (thalline margin) concolorous with thallus, glossy, epruinose. Exciple with an orange-brown inner part and a hyaline ectal part, K–. Epihymenium orange-brown, 20–35 µm thick. Hypothecium hyaline to orange. Hymenium 200–250 µm high, hyaline, inspersed, amyloid. Asci 8-spored. Ascospores hyaline, 2-celled, slightly curved (sulphurata-type fide Sipman, 1983: 44), 60–85 x 22–26 µm, spore walls 2–3 µm thick with thin, smooth epispore. Secondary chemistry: usnic acid and zeorin.