Placidiopsis cinerascens (Nyl.) Breuss  
Family: Verrucariaceae
Placidiopsis cinerascens image
André Aptroot
  • Greater Sonoran Desert
  • Resources
Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2002. Lichen Flora of the Greater Sonoran Desert Region. Vol 1.
Thallus: squamulose, 0.3-3 mm diam. squamules: 0.15-0.35 mm diam., 0.15-0.35 mm thick, discrete to contiguous or with margins slightly overlapping, flat or slightly convex, broadly attached to the substrate, roundish or incised-lobed upper surface: greenish gray to brownish, dull, naked or slightly grayish pruinose upper cortex: 15-25 µm, always overlain by an epinecral layer 10-30 µm medulla: white; algal layer: normally filling most of the thallus; algal-free medulla (in thick squamules): with many spherical cells 6-11 µm in diam. lower cortex: indistinct, composed of a few rows of more densely aggregated spherical cells; rhizohyphae: hyaline, 3-4 µm thick lower surface: pale, fastened by a loose rhizohyphal weft Perithecia: broadly pyriform to almost globose, up to 0.3 mm broad and ± bulging the lower side of squamules; exciple: colorless to yellowish, black around ostiolum; periphyses: 20-30 x 2.5-3 µm; apical cell: often slightly swollen (-4 µm) asci: oblong clavate, 55-65 x 11-16 µm, 8-spored ascospores: ellipsoid or ovoid, 2-celled, often slightly constricted at the septum, c. 15-19 x 6-7.5 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on ± calciferous soil on open places; Californian specimens are from serpentine soil World distribution: mediterranean Europe and Morocco, central Asia, SW North America and Mexico in mediterranean climates Sonoran distribution: Baja California.
Placidiopsis cinerascens
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Placidiopsis cinerascens image
Chris Wagner
Placidiopsis cinerascens image
Chris Wagner
Placidiopsis cinerascens image
Chris Wagner
Placidiopsis cinerascens image
Chris Wagner
Placidiopsis cinerascens image
Placidiopsis cinerascens image
Placidiopsis cinerascens image
Placidiopsis cinerascens image
Placidiopsis cinerascens image
Placidiopsis cinerascens image
Chris Wagner
Placidiopsis cinerascens image
Placidiopsis cinerascens image
Chris Wagner
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