Abstract
Lichen community structure was examined on silicious rocks in the Brooks Range of Alaska near Anaktuvuk Pass. Rocks with 0* slope were the most variable with respect to crustose, foliose and fruticose growth forms. Foliose lichens were the most common growth form of 0 slopes, with Parmelia stygia accounting for about 14% of the cover. Foliose lichens also dominated the 30 slopes, with P. stygia accounting for 23% of the cover. Crustose and foliose lichens were equally common on 60 slopes, with P. almquistii accounting for 32% of the cover. Vertical surfaces were dominated by crustose species of which Sporastatia testudinea, with 8% cover, was the most common species.
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