Guide to Liverworts of Oregon: Key to Pellia 1
HOME SPECIES INDEX GENUS INDEX GLOSSARY
1a plants thallose > 2b chloroplasts numerous > 62a thallus tissue homogeneous > 63b thallus ribbon like > 65b ventral scales absent > 66b thallus without hairs > 67b Sex organs dorsal; 69b Sex organs dorsal; Pellia
Pellia alpicola - Left: Involucre; right: slime papillae. Staley Ridge, Douglas Co., Oregon. DHW m2302.
1a Involucre short tubular, angular, often elliptical; slime papillae of four or more cells; all inner cells thin walled; thalli unisexual; largely restricted to subalpine and alpine zones in Oregon.
Pellia alpicola
Left: Pellia epiphylla - Darrington District, Washington. USFS 1956b. Right: Pellia neesiana - Slime papillae. Tumalo Creek, Deschutes County, Oregon. DHW m2700.
1b Involucre flaplike or straight tubular; slime papillae of no more than three cells; inner thallus cells with some cell walls strongly thickened; thalli unisexual or bisexual; often at low elevations.
(COUPLET 2)