BARNES — NORTH AMERICAN MOSSES. 185 



II. Costa scabrous or lamellose at hack. 



Xeaves with pellucid hair points . . . . C. introflexus, 78 . 

 Leaves not hair pointed. 



Alar cells round, lamina wanting .... C. frigidns, 79. 



No auricles C. Virginicus, 80. 



FISSIDENS, p. 8i {incl. Conomitrium, p. 89^) 



I. (EUFISSIDENS.) Plants terrestrial or submersed but not flout- 

 ing; leaves soft, one layer of cells. 



A. Fruit terminal. 



I. Monoicous, male flowers axillary. 



[Jf. falcatnltis may be songht here.] 



Xieaf-cells small, densely chlorophyllose, in distinct rows F. limbatns, 82. 

 Xieaf-cells large, not densely chlorophyllose, nor in dis- 

 tinct rows F. bryoides, 81. 



:2. Dioicous or monoicous with the male flowers terminal on a root- 

 ing branch at the base of the female stem. 



a. Leaf-cells 1^-2 times as long as wide, large, distinct. 



Plants less than 1 mm. high, leaves two or three pairs F. Closteri, 81. 



Plants 2-4 mm. high, wholly hyaline, leaves 3-5 pairs F. hyalinus, 84. 



b. Leaf-cells almost or quite isodiam,etric, often obscure. 

 [F. limhatus may be sought here.J 



Leaves with a narrow border, at least on vaginant lamina. 

 Marginal leaf-cells not papillose. 

 Leaves acute, costa percurrent. 

 Vaginant lamina not reaching middle of leaf, peris- 

 tome arising below the mouth . . . F. pnsillus, 94. 

 Vaginant lamina reaching middle of leaf, peristome 



not arising below the mouth . . . F. incnrvus,^ 82. 

 Leaves obtuse, costa vanishing below apex F. obtnsifolius, var. 95. 



1 See Barnes: Bot. Gaz. 13: 1. 1883. 

 ' See Appendix, no. 93. 



