BARNES NORTH AMERICAN MOSSES. 187 



In the Revision of N. A. species of Fissidens, 1 FF. inconstans, exiguus 

 and minutulus were reduced to F. incur 'vus, the latter two forming va- 

 rieties. FF. bryoides ccespitans, 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, 2 p. 90. 



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



Robust, tufts 4-6 cm. deep ., . . L. g-laucum (L.) Sch., 3 90. 



Smaller tufts scarcely 2 cm. deep . L. srlaucum albidum, 4 91. 



Capsule exactly terminal, leaves squarrose, very short 



and very broad ....... L. minus, 5 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. purpureus, 92. 



Costa long excurrent, teeth articulate to the middle. 



Leaf margin entire C. eonicns, 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>u D. capillaceum, 93. 



Capsule cernuous, spores 30-44/* , . . D. incl inatum, 94. 

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



1 See Barnes : Bot. Gaz. 12: 1. 1889. 



3 See E. G. Britton, Bull. Torr. Bot. Club 19: 189. 1892. 



3 L. vulgare L. & J. Man. 90. 



4 i. albidum (Brid.) Lindb. L. minus Sulliv. non Hampe. 



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



