Porpidia crustulata
(concentric boulder lichen)
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Type
Height
Photo #1
crustose
Crustose is a habit of some types of algae and lichens in which the organism grows tightly appressed to a substrate, forming a biological layer. Separation from the substrate is impossible without destruction.
lichen
< ⅛" x 1"-4"
March
Habitat:
Common on
siliceous
Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent.
rocks, stones and pebbles, very rarely on wood or bark.
