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Krogia microphylla Timdal
Nomenclature
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Family: RamalinaceaeGenus: Krogia
SUMMARY
Mycobank MB 517788
Thallus squamulose, effuse. Squamules to 0.3 mm wide when young but soon coalescing into a continuous, microphyllinous crust, deeply and irregularly divided into ca. 0.1 wide lobes, ascending, irregularly imbricate, pale brown (old herbarium material), with scattered patches of orange (K+ purple) spots, epruinose, dull; margin concolorous with upper side, not fibrillose; lower side pale brown; soredia and isidia absent. Upper cortex poorly defined, composed of a thin, rather loose layer of irregularly oriented hyphae. Algal layer filling the inner part of the squamule. Medulla and/or lower cortex poorly defined. No crystals in thallus section (polarized light), PD–, K–, K/I–. Prothallus lacking. Apothecia biatorine, to 0.7 mm diam. when simple, but often forming up to 1 mm diam. aggregates, with a rusty brown, more or less plane disc and a grayish brown, slightly shiny, not fibrillose, often flexuous margin. Proper exciple dark olivaceous brown, K+ green in the inner part, pale brown to colourless in the rim, composed of radiating, closely conglutinated, thick-walled hyphae with cylindrical lumina, not containing crystals. Hypothecium continuous with proper exciple, dark olivaceous brown, K+ green, composed of closely conglutinated, thick-walled hyphae with angular to cylindrical lumina, not containing crystals. Hymenium and epithecium colourless, not containing crystals. Paraphyses simple or sparingly branched, moderately conglutinated, rather thin-walled; apical cell slightly swollen, colourless. Ascus clavate, surrounded by a thin amyloid sheet; tholus well-developed, not amyloid or with a wide, faintly amyloid tube, with a well-developed ocular chamber when young. Ascospores eight in the ascus, colourless, thin-walled, filiform, curved, spirally arranged, simple or with 1–3 pseudosepta, 25–35 x ca. 1.0 µm (n = 20). Secondary chemistry: no lichen substances (by TLC).