Anzia (aka “Black-Foam Lichens”)
Substrate: On bark.
Habitat: Usually in forests.
Description: Medium-sized to small foliose lichens, gray to greenish; lower surface covered with a thick, spongy, black hypothallus. Photobiont green (Trebouxia?). Apothecia lecanorine, with concave, shiny brown disks; spores colorless, tiny (3-6 x 1.2-2 um), 1-celled, oblong or curved, many per ascus.
Chemistry: Cortex PD-, K+ yellow, KC-, C- (atranorin); medulla PD-, K-, KC-, C-, UV+ white (divaricatic acid).
Lookalikes: The black, spongy lower surface is unique among North American Lichens.
Database Entry: Distance Everheart 12-26-13