Candelaria Concolor
Image by Alan Rockerfeller
Flavoparmelia baltimorensis, known as the rock greenshield lichen, is a medium to large lichen. Its dry upper surface is yellow-green, and the lobes are round without pseudocyphellae. The upper side has pustule-like growths resembling isidia. The lower surface is black with a slim brown margin.
The very similar Flavoparmelia caperata usually grows on the bark of trees, but may be found on rock. The granular soredia produced in irregular soralia distinguishes it from F. baltimorensis, which lacks true soredia.
Flavopunctelia flaventior and Flavopunctelia soredica have pseudocyphellae in the upper surface of the thallus, and the medulla is C+ red.
