so 
Wisconsin Academy of Sciences , Arts and Letters. 
B. Costa double, short, or none. 
1. Alar cells enlarged, hyaline or colored. 
a. Lid conic, often apiculate, capsule oval to oblong (1:1—2.5). 
i. Alar cells pellucid, not conspicuously colored. 
* Capside costate and arcuate when dry. 
Alar cells short, yellow, thick walled H. curYifolimn, 159. 
Alar cells inflated, hyaline, thin-walled . . H. arcuatnm , 1 Lindb. 
* * Capside not costate ivhen dry. 
Vaginule short (1: 2) covered with longer hairs . H„ molluscum, 147. 
Vaginule longer (1:3+) 
Plants shining yellow, leaves subserrulate . H. depressulmn, 151. 
Plants bright- to pale green, leaves quite entire. 
Lid sharply apiculate, orange, capsule incurved when 
dry . ..H. calliclirouin, 154 
Lid not apiculate, capsule strongly arcuate when dry H. pratense, 161. 
ii. Alar cells orange. 
Leaves quite entire.H. Bamberger!, 162. 
Leaves serrulate. 
Ecostate ..H. circinale, 152. 
Obsoletely bicostate.H. Sequoieti, 153. 
b. Lid rostrate, capside cylindric (1: 3.5 +). 
Leaves laterally compressed both sides, alar cells orange H. Bambergeri, 162. 
Leaves not laterally compressed. 
Pericliaetial leaves bicostate to middle, plicate . . H. reptile, 148. 
Perichaetial leaves shortly bicostate, plicate . H. ciipressiforme, 158. 
Perichaetial leaves ecostate, plicate, cilia solitary, ap- 
pendiculate .. H. imponens, 155. 
Perichaetial leaves ecostate, not plicate, cilia 2, inappen- 
diculate .. H. subiinponens, 156. 
1 Renauld and Cardot: FI. Miq. 55. 
