Psoroma melanizum Zahlbr.
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Psoroma melanizum Zahlbr., Akad. Wiss. Wien, Math.-Naturwiss. Kl., Denkschr. 104: 277 (1941)
Psoroma melanizum Zahlbr.
Biostatus
Nomenclature
Zahlbr.
Zahlbr.
1941
277
ICN
Psoroma melanizum Zahlbr.
species
Psoroma melanizum
Classification
Descriptions
Psoroma melanizum Zahlbr.
Thallus squamulose, closely attached, in compact rosettes, often confluent in mosaics, 1-3 cm diam., bordered by a short, black, byssoid prothallus, 1-2 mm wide. Squamules minute, 0.2-1.0 mm diam., round to irregular, concave to plane to subconvex, margins entire, slightly thickened, often secondarily lobulate and dispersed at margins, coalescing, imbricate centrally, forming a diffract-areolate crust, prothallus visible between areolae, yellowish to pale whitish at margins, whole thallus superficially blackened, smooth to coriaceous, shining, waxy, epruinose. Cephalodia frequent, scattered, marginal on squamules, occasionally laminal or on hyphae of prothallus, ± rosette-shaped, dark purplish-grey, rising above squamules, wrinkled-plicate, smooth to slightly granular. Apothecia sessile, frequent centrally, rarely marginal, round to irregular, 0.5-1.5 mm diam., disc brown-black, plane to subconcave, matt, epruinose, margins thin, pale or concolorous with thallus, crenulate. Ascospores ellipsoid to subglobose, 12 µm diam., or smaller, 4-6 × 3 µm.
Taxonomic concepts
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Metadata
e4a4df10-8315-41cb-ab3a-c63c911437d3
scientific name
Names_Plants
1 January 2000
15 June 2010