Allantoparmelia (aka “Rock Grub Lichens”)
Habitat: On alpine rocks.
Description: Very dark olive- to yellow-brown or black with thick, narrow lobes; (ca. 0.2-1.5 mm across); closely appressed; the more elongate lobes worm-like, with irregular constrictions (giving the lichen its English name); pseudocyphellae, soredia & isidia absent; lower surface tan to black, without rhizines but sometimes attached to the substrate with thick, peg-like outgrowths of the lower cortex. Photobiont green (Trebouxia?). Apothecia lecanorine; pycnidia common, entirely embedded in the thallus & scattered over the lobes.
Chemistry: Cortex PD-, K-, KC-, C- (atranorin lacking); medulla with various compounds.
Lookalikes: Hypogymnia, Brodoa, & Lobothallia all have thick, convex lobes & can resemble Allantoparmelia. Hypogymnia is generally larger, with hollow lobes. Most species of Melanelia have broader, flatter lobes, often with pseudocyphellae.
Bibliography: Lichens of North America, by Brodo, Sharnoff, & Sharnoff
Database Entry: Distance Everheart 12-26-13