Arctoparmelia centrifuga #

Taxon #

Arctoparmelia centrifuga

Organization #

Shield-Like Parmelioids

Identification #

A lichen which forms concentric, ripple-like thalli on rocks. There are other species which can create concentric rings on rocks, but none are so ubiquitous in Alaska as this species. Concentric forms of Montanelia tominii are a much darker olive green. A. subcentrifuga does not always form concentric rings and when it does, they are usually much weaker and less prolific than in A. centrifuga. All Arctoparmelia species produce similarly light brown apothecia. A. centrifuga lacks soredia.

Substrate #

Saxicolous

Chemical Tests #

cortex: K+ yellow; medulla K-, KC+ red, Pd-, I- (CLH)