Guide to Liverworts of Oregon: Key to Genera 65
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1a plants thallose > 2b chloroplasts numerous > 62a thallus tissue homogeneous > 63b thallus ribbon like > 65
Blasia pusilla, ventral view. Sutton Beach, Lane Co., Oregon. DHW m2174a.
65a Ventral scales present, small, in two rows; thallus producing multicellular gemmae of two kinds:
stellate gemmae exogenously on dorsal surface and ovoid gemmae in flask-shaped containers; Nostoc
colonies embedded in thallus, visible with hand lens
Blasia pusilla
Pellia neesiana, underside; Marys Peak, Benton County, Oregon. DHW m2443.
65b Ventral scales absent; gemmae (if any) not stellate, not produced in containers; Nostoc absent
(Couplet 66)