192 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



§1. Aloidellae. 



Synoicous B. brevirostris, 115. 



Dioicous. 

 Annulus broad, revoluble, lid J^ to % length of capsule. 

 Peristome twice twisted. 

 Leaves round-ovate, obtuse . . . B. macrorhyncha, 125. 

 Leaves oblong, obtuse or apiculate . . . B. rigida, 116. 

 Peristome straight or slightly twisted . . B. aloides, 162. 



Aanulus small, persistent, lid Yq length of capsule B. ambigua, 116. 



§11. Chloronotae. 



Leaves with hair points. 



Tip of leaf hyaline B. membranifolia, 116. 



Tip of leaf concolorous. 



Hair smooth, leaves acute or somewhat obtuse B. chloronotos, 116. 



Hair serrate, leaves rounded obtuse . . . B. Henrici, 136. 



Leaves without hair points B. Mannise, 127. 



§111. Cuneifoliae. 



Leaves bordered by 2-4 rows of thickened cells . B. mai^inata, 118. 

 Leaves bordered by 1 row of round yellowish cells with 



prominent papillae, aristate .... B. Tahliana, 117. 



Leaves with a broad yellowish border, not pointed B. Egelingi, 128. 



Leaves without a border. 



Costa excurrent into a hoary hair . . . . B. muralis, 119. 

 Costa forming a short point or ceasing below apex. 

 Leaf cells smooth. 

 Margins plane. 

 Upper leaves opaque at the margins . B. caneifolia, 117. 



Upper leaves pellucid at the margins B. snbcarnifolia, 130. 



Margins recurved above and below the middle at 



one side B. carnifolia, 129. 



Leaf cells papillose [incl. B. amplexaf] 

 Peristome membrane long .... B. breripes, 119. 

 Peristome membrane short. 



Inner perichaetial leaves short . . B. Bolanderi, 118. 



Inner perichaetial leaves long-sheathing, abruptly 



reflexed B. amplexa, 118. 



