Powdery Saucer Lichen
Ochrolechia androgyna
Description 6
Thallus: crustose, frequently rugose to verrucose-aereolate, much expanded; areoles: thin to more often quite thick; surface: yellowish white or pale gray, smooth to rough, somewhat shiny, sorediate; soredia: yellowish or whitish yellow, coarsely granular; soralia: yellowish white to light orange, abundant, conspicuous, diffuse to well delimited, usually beginning as small, scattered, hemispherical masses of coarse soredia, later coalescing into broader, irregular sorediate patches, K- or +brown, C+ red, KC+ red, P-; Apothecia: not seen in North (or South) America; Pycnidia: not seen; Spot tests: thallus cortex (under necrotic layer): K- or K+ pale yellow, C+ red, KC+ red, P-; medulla: K-, C- or sometimes C+ very pale or quite distinct pink, KC-, P-; all tissues: UV- or white; Secondary metabolites: gyrophoric acid (major), lecanoric acid (trace), sometimes some unidentified fatty acids, hiascic acid (+major) seen in South American specimens by Messuti and Lumbsch (2000).; Substrate and ecology: on deciduous and coniferous tree bark, wood, rocks and over mosses and detritus; World distribution: boreal to arctic, circumpolar, with a notable disjunct southwestern population, especially along the Sierra Nevada Mountains; Sonoran distribution: Arizona, southern California, Baja California, Chihuahua.; Notes: When on bark (in temperate regions), this species is frequently confused with O. arborea, though a UV test of the thallus surface should readily distinguish the two, as O. arborea has UV+ bright yellow soralia (due to lichexanthone), while O. androgyna is at most whitish if not UV-. Ochrolechia arborea also has a much thinner and more effuse, orbicular thallus, that is always less well developed than verruculose, while O. androgyna has a much thicker (and often larger) thalli, that are often quite verrucose. The disjunct California population of O. androgyna is morphologically uniform and, due differences in fatty acid production, may be a separate taxon (Brodo (1991).
Fuentes y créditos
- (c) Annelie Burghause, algunos derechos reservados (CC BY-NC-SA), http://www.flickr.com/photos/aburgh/9486731884/
- František Bouda, sin restricciones conocidas de derechos (dominio publico), https://www.biolib.cz/IMG/GAL/5478.jpg
- (c) Jason Hollinger, algunos derechos reservados (CC BY-SA), https://images.mushroomobserver.org/640/239744.jpg
- (c) Jason Hollinger, algunos derechos reservados (CC BY-SA), https://images.mushroomobserver.org/640/239745.jpg
- (c) Jason Hollinger, algunos derechos reservados (CC BY-SA), https://images.mushroomobserver.org/640/239746.jpg
- (c) Lichen Unlimited: Arizona State University, Tempe., algunos derechos reservados (CC BY-NC-SA), http://eol.org/data_objects/10548567
