Abraded Camouflage Lichen

Description:

Thallus: adnate to loosely adnate appressed throughout or occasionally slightly reflexed at the periphery, foliose, up to 8 (-10) cm diam., lobate; lobes: short and rounded to somewhat elongate, discrete to more often contiguous or subimbricate, 1-4 (-6) mm broad, ± flat; upper surface: olive-green or olive-brown to rather dark reddish brown, smooth to weakly pitted or rugulose near the periphery, inward usually somewhat more strongly rugose; dull throughout or occasionally shiny, especially near the periphery; sometimes with small and very obscure, concolorous pseudocyphellae on the lobes; sorediate or isidiate or (usually) both; isidia: arising within but also between the soralia, cylindrical, not or infrequently branched, to 0.2 (-0.4) mm long and 0.02-0.06 mm diam.; soredia: granular, frequently becoming brownish and isidioid or isidiate; in laminal soralia that often arise from the obscure pseudocyphellae and are punctiform and discrete, or become ± confluent in central parts; lower surface: pale brown to dark brown or black, often paler at the periphery; ± smooth to rugose, dull to rather shiny; moderately rhizinate, the rhizines concolorous with the lower surface; Apothecia: rare, up to 2.5 mm diam., sessile, ± flat, the margin entire when young, soon sorediate and isidiate; asci: clavate, 8-spored; ascospores

Habitat:

Spotted on a plum tree in my backyard.