Consortium of Lichen Herbaria - Physcia americana

Physcia americana G. Merr.
Family: Physciaceae Powdery Rosette Lichen Samuel Brinker	North Carolina Biodiversity Project Resources North Carolina Biodiversity Project MB#476173 TYPE. UNITED STATES. CONNECTICUT, Rocky Hill, 1895, F.W. Stamer s.n. (M). Description. Lichenized fungus. Thallus foliose, often circular in outline, pale greenish gray, adnate on substrate; lobes 0.6-1.5 mm wide; vegetative diaspores laminal, round soralia containing greenish or whitish granular soredia. Photobiont trebouxoid alga. Lower surface corticate, white with simple, white rhizines. Ascomata lecanorine apothecia, rare. Chemistry. Cortex and medulla K+ yellow; secondary metabolites atronorin and unknown terpenes. Substrate and Habitat. Mostly on bark of hardwood trees in hardwood and mixed forests. Distribution. Eastern North America; in North Carolina common throughout. Literature Brodo, I.M., S.D. Sharnoff & S. Sharnoff. (2001) Lichens of North America. New Haven: Yale University Press. 725 pp. Evans, A.W. & M.S. Meyrowitz. (1926) Catalogue of the lichens of Connecticut. State of Connecticut, State Geological and Natural History Survey Bulletin 37: 1-49 pp (original diagnosis and notes by G.K. Merrill).
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