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116 ; opcrculo fere capsulae aequilongo conico oblique longirostro; calyptra cuculliformi basi lata paulum infra operculum producta glaberrima; sporis luteo-fuscis granulosis $1⁄2000$ unc. diametro metientibus.

On trees, Northwest Coast, Menzies. Coast range of mountains, south of San Francisco, California, Bigelow, Bolander. Vancouver's Island, Lyall.

The specimens collected by Menzies. and figured by Hooker and Schwægrichen (1. c), are unusually elongated and distantly pinnate, owing doubtless to local influences, and therefore do not represent the normal form of the species, as here figured from numerous specimens furnished by other collectors.

This species clearly belongs to Alsia,—a genus closely allied to Leptodon,—and stands in the same relation to Leptodon Smithii that its only congener, Alsia Californica, Sulliv. (Crypt. U. States Expl. Exped. Wilkes, p. 25, t. 25), does to Leptodon trichomitrion.

TAB. 72$b$.—