(644.) L. imperfecta, C. M. & Kindb. (n. sp.); Canadian Musci, No. 489.

Tufts loose, green, not shining. Stem pinnate, radicant; paraphyllia few. Stem-leaves smooth, decurrent, often bistriate, from a short-ovate base suddenly narrowed into a long subulate or filiform, often curved acumen, when dry loosely appressed with a patent acumen, distant and patent-open when moist; basal margins recurved; branch-leaves long-attenuate; inner cells near the costa oblong-sublinear, the marginal subquadrate, the other oval-oblong; costa vanishing in the base of the acumen. Perichetial leaves nerveless; cells sublinear. Capsule small, oblong, straight; lid conic, subobtuse; peristome double, teeth incurved, cilia short or none, basal membrane indistinct; pedicel smooth, fine, flexuous, about 6 mm. long. Dioecious. Allied to the European Lescuraea striata, (Schw.) Schimp. Bryol. Europ.

On both earth and bark at the bases of trees on both sides of the Columbia River at Revelstoke, B.C., May 19th, 1890. (Macoun.)