You are here
Verrucaria amylacea
EOL Text
Thallus: diffuse, indistinct or almost absent, thin or rarely thick (up to 0.1-0.2 mm), irregularly and sparsely fissured to continuous and imperfectly areolate; surface: white or gray to pale brown, sometimes with tiny brown dots, smooth or rough, dull; anatomy: upper cortex scarcely distinguishable as a thin paraplectenchyma of small cells 3-5 µm in diam., diffusely delimited from the algal layer, with algal cells up to 10 µm in diam. forming an irregular layer intermixed with tiny substrate particles; Perithecia: on thin thalli hemispherical emergent, their bases sometimes narrowly covered by a thin thalline layer, semi-immersed in thicker thalli; exciple: 0.2-0.3 mm wide, subglobose, colorless to brown; involucrellum: appressed to the exciple, extending down to exciple-base level, 50-70 µm thick, rather even in thickness; periphyses 20-25 µm long; asci: clavate, 8-spored; ascospores: hyaline, simple, ellipsoid , 14-20 x 7-9 µm; Pycnidia: unknown; Spot tests: all negative; Secondary metabolites: none detected.; Substrate and ecology: endolithic to thinly epilithic, on calcareous or at least superficially calciferous rocks; World distribution: central Europe and North America; Sonoran distribution: Arizona and southern California.; Notes: Thallus development and spore size is similar to Verrucaria floerkeana, but this latter species has a thinner involucrellum.
License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
Rights holder/Author | Lichen Unlimited: Arizona State University, Tempe. 2002-2011 |
Source | http://symbiota.org/nalichens/taxa/index.php?taxon=56534 |
Rounded Global Status Rank: GNR - Not Yet Ranked
License | http://creativecommons.org/licenses/by-nc/3.0/ |
Rights holder/Author | NatureServe |
Source | http://explorer.natureserve.org/servlet/NatureServe?searchName=Verrucaria+amylacea |