184 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



Costa with two stereid bands. 

 Lamina above more or less bi-stratose. 



Margin and costa serrulate D. fulvum, 70. 



Margin entire, apex usually broken ... D. yiride, 69. 



Lamina throughout uni-stratose. 



Upper cells rectangular and mamillose . . D. montanum, 69. 



Upper cells less regular, not mamillose . . . D. flagellare, 70. 



DICRANODONTIUM, p. 77. 



Cells at the basal angles enlarged. 



Quadrate, teeth deeply bifid . D. Millspaughi, 1 90. 



Rectangular, teeth bifid to base . . . . D. longirostre, 77. 



Cells at the basal angles not enlarged D. Virginicum, 89. 



CAMPYLOPUS, p. 77. 

 I. Costa smooth at back. 



A. Auricles none. 

 [C. gracilicaulis may belong here.] 



Cells of the costa uniform in transverse section . . C. Leanus, 78. 

 Cells of the costa unlike in transverse section, stereids 

 forming 2-3 dorsal layers. 



Hyaline cells superior, in one row C. Schimperi, 91. 



Hyaline cells superior, in two rows C. Henrici. 92. 



B. Auricles present. 



No lamina except small colored auricles ... C. Hallii, 79 .. 

 Lamina distinct. 

 Perichaetial leaves concolorous. 



Auricles brown, plane, decurrent C. Tallulensis, 78. 

 Auricles whitish, large. 



Leaves serrulate at apex C. sufoleucogaster, 79. 



Leaves spinulose serrate at apex ... C. Donnellii, 79. 



Auricles dirty red . . . . . C. angustiretis, 80 . 

 Perichaetial leaves with hyaline points (may include C. Don- 



nellii and C. angustiretis} . . . C. gracilicaulis, 80. 



i Campylopus flexuosus L. & J. Man. 78, not of BrideL C. flexuosus Brid. is not 

 found in America. 



