Preissia quadrata
From Natural History of Southeast Alaska
Preissia quadrata: So far found in two very different locations near the Sitka road system. It grows under a small overhang on a cliff with a waterfall flowing over it, a very wet microhabitat. It has also been found at 4000 feet on Bear Mountain at the base of a rocky outcrop.
Family: Marchantiaceae
Status: Documented
Abundance: Uncommon
Preferred Habitats: Alpine
Observed at: West Fork Indian River Valley, Bear Mountain, Rust Lake
Southeastern Alaska Distribution: Throughout and often abundant.
Habitat: Mostly on basic substrates, usually on sterile soils at the bases of boulders, cliffs and rock outcrops. Sometimes in canyons or gorges. Frequent on recent tills in Glacier Bay. Although in exposed, highly insolated and well drained sites, the plants are most frequent in semi-”protected” micro-habitats. From sea level to the subalpine, perhaps into the alpine.
Comments: Sporophytes are frequent.
