Canoparmelia amazonica

C. amazonica closely resembles a Parmotrema. The thallus has isidia (the erect appendages shown in the picture below and the tiny ones on the lobe margins in the left-hand picture). In places the margins are eroded and the white medulla is exposed (also picture left). The lower surface is brown near the edge but becomes black away from it. The genus is described as having rhizines on the lower surface to the margin edge. But with this species the marginal rhizines are short and rudimentary and difficult to detect.