76 
Wisconsin Academy of Sciences , Arts and Letters. 
2. Costa very short or none or double. 
a. Alar cells abruptly enlarged (often inflated and colored). 1 
i. Operculum long subidate rostrate. 
Capsule horizontal, strongly constricted under mouth when 
dry, leaves quite entire.H. demissum, 80. 
Capsule suberect, slightly constricted, leaves serrulate at 
apex.H. microcarpam, 84. 
Capsule inclined, wide mouthed, leaves spinulose-dentate 
at apex.H. laxepatulum, 86. 
ii. Operculum short rostrate. 
Leaves roundish elliptical, subacute or apiculate . H. Novse-Cesariae, 81. 
Leaves filiform acuminate. 
Cilia 2, annulus 0, capsule oblong (1:2—2.5) . . H. recuryans, 82. 
Cilia 0, annulus 0, capsule cylindric (1:3.5) . H. cylindricarpiiin, 83. 
Cilia 1, annulus simple, large, capsule oblong . . H. Jamesii, 85. 
Leaves acute or stoutly acuminate. 
Entire.H. Haldanianiini, 163. 
Sharply serrate.H. nemorosttin, 164. 
ill. Operculum convex or conic. 
Leaves falcate. 
[H. palustre, var. liamulosum may be sought here.] 
Scarcely costate, alar cells orange . . . H. eugyrium, 171. 
Costa reaching middle, alar cells hyaline . . H. ocliraceum, 172. 
Leaves not falcate. 
Abruptly filiform apiculate, entire, alar cells not con¬ 
spicuous .H. trichophorum, 100. 
Gradually filiform acuminate, alar cells orange. 
Acute or short apiculate, alar cells few, large . H. palustre, 165. 
Plants slender, 2—3 cm. long. 
Branches erect, leaves serrate . . H. Miihlenbeckii, 111. 
Branches intricate, leaves nearly entire . H. Fitzgeraldi, 112. 
Plants stout, 7—10 cm. long, leaves quite entire H. stellatum, 131. 
Obtuse, entire, alar cells hyaline . . . H. cuspidatum, 176. 
1 In 81 so few as to be easily overlooked. 
