BAENES — NORTH AMERICAN MOSSES. 187 



In the Revision of N. A. species of Pissidens/ FF. inconstans, exiguus 

 and minutulus were reduced to F. incurvus, the latter two forming va- 

 rieties. FF. bryoides ecespitans, crassipes, Hallii and Texanus are 

 relegated to the list of doubtful species. FF. Bambergeri Schimp. I 

 regard as a form of F. incurvus; F. viridulus is a form, possibly a sub- 

 species, of the same. It may be known by its thin-walled capsule, with 

 the peristome inserted below the mouth. Neither are worthy of a distinct 

 place in the key. "F. tamarindifolius Don" (Mac. Cat. 36), seems to 

 be F. tamarindifolius Brid. which is a variety of F. incurvus. 



LEUCOBRyUM,^ p. 90. 



Capsule apparently lateral (by innovations), leaves ovate lanceolate. 



Robust, tufts 4-6 cm. deep . . . L. g'lancnm (L.) Sch.,« 90. 



Smaller tufts scarcely 2 cm. deep . L. glaucum albidum,* 91. 



Capsule exactly terminal, leaves squarrose, very short 



and very broad L. minns,^ 91. 



CERATODON, p. 92. 



Costa percurrent or vanishing below apex. 

 Capsule distinctly strumose, articulations of teeth 



few C. heterophyllus, 101. 



Capsule not distinctly strumose, articulations of 



teeth many C. pnrpureus, 92. 



Costa long excurrent, teeth articulate to the middle. 



Leaf margin entire . C. conicus, 100. 



Leaf margin serrulate toward apex . . . . C. minor, 92. 



TRICHODON, p. 92. 



Cells of the leaf base linear, above rectangular or in- 

 distinct T. cylindricus, 93. 



Cells of leaf base rectangular (1 : 2-4), above quadrate T. flexifolius, 102. 



DISTICHIUM, p. 93. 

 Costa long excurrent. 



Capsule erect, spores 17-20/i . . . . D. capillacenm, 93. 



Capsule cernuous, spores 30-44// . . . D. inclinatum, 94. 

 Costa percurrent or vanishing below the apex . D. Macounii, 106. 



1 See Barnes : Bot. Gaz. 1«: 1. 1889. 



= See E. Q. Britton, BnU. Torr. Bot. Club 19: 189. 1892. 



' L. vulgare L. & J. Man. 90. 



*L. albidum (Brid.) Liudb. L. minus Sulliv. non Hampe. 



s L. sediforme L, & J . Man. 91. 



