Pseudothecia: black, at first immersed, soon superficial, 0.12-0.2 mm in diam.; ascomatal wall: brown, lighter at the base and the inner parts, K+ black, apically with irregular thickenings, 20-25 µm thick at the base, 40-60 µm above, paraplectenchymatous, composed of several rows of tangentially compressed cells (7-11 x 2-3 µm, the inner ones with thin and hyaline walls, the outer ones with thick, dark walls); paraphysoids: simple, septate, soon disappearing; periphyses: of two kinds: the lower ones long and septate, thin-walled, 16-22 x 1 µm, the upper ones short, simple, with thicker walls, 7-12 x 2(-4) µm); asci: clavate, 50-60 x 8-10 µm, 8-spored, with an apically distinctly thickened wall; ascospores: soon becoming brown, dark brown when mature, at first simple and ornamented with very small granulation, then 1-septate and smooth, with unequal cells in size and shape containing numerous small lipid drops, not or slightly constricted at the septum, ellipsoid to ovoid, with obtuse (rarely pointed) ends, 10.5-14 x 6-8 µm, without a distinct perispore; Pycnidia: not seen.; Host: on the thallus of Placidiopsis cinerascens; World distribution: North America; Sonoran distribution: Known from one location in central Baja California.; Notes: Endococcus incrassatus is well distinguished from other species of the genus by the superficial ascomata with irregular thickenings in the ostiolar region and by its host (Placidiopsis cinerascens).
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