Guide to Liverworts of Oregon: Key to Genera 80
HOME SPECIES INDEX GENUS INDEX GLOSSARY
1a plants thallose > 2b chloroplasts numerous > 62b thallus tissue complex > 70b terrestrial > 72b pores differentiated > 73b gemmae absent > 75b trigones small or absent > 77b pores not stellate > 79a pores compound > 80
Marys Peak, Benton Co., Oregon. DHW m1641.
80a Median ventral scales with reniform appendages that fold back over the dorsal side of apical notch; ventral scales in four or more rows; female receptacle deeply lobed; gemmae cups often present; widespread and common
Marchantia
Pressia quadrata - Left: North Cascades National Park, WA. M. Hutten. Right: Elkhorn Ridge, Baker Co, Oregon.
80b Scale appendages very small, narrow, tapering to tip, not folded over apical notch; ventral scales in two rows; female receptacles nearly entire, +/- hemispheric; gemmae cups lacking; very rare
Preissia quadrata
Copyright 2006 Northwest Botanical Institute