248 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



Auricles distinct. 



Leaves usually denticulate . . . . H. uncinatum, 382.. 

 Leaves entire or obtusely sinuolate. 



Falciform, costa 60-120// broad, capsule cylindric H. Sendtneri, 381. 

 Various, costa 30-60/* broad, capsule oblong H. aduncnm, 1 380. 



B. Costa double and short, or none. 



i. Plants regularly pinnate. (2 on p. 249.) 

 * Capsule costate and arcuate when dry. 



Alar cells short, yellow, thick walled . . . H. curvifolium, 396.. 

 Alar cells inflated, hyaline, thin walled . . H. Patientiee, 2 511% ~ 



* * Capsule not costate when dry. 



H Leaves quite entire. 

 [H. imponens and B. subimponens may be sought here.] 



Alar cells dilated, hyaline or yellowish. 8 



Cilia 2, nodulose H, Dieckii, 577*. 



Cilia 3 H. callichroum, 393. 



Alar cells not dilated. 



Cells uniform throughout leaf H. Watsoni, 386. 



Alar cells subquadrate, rest elongated . . H. complexum, 396. 



H 4 Leaves serrate or denticulate all around. (H +- ) 



Capsule long cylindric, suberect or slightly incurved H. imponens, 393. 

 Capsule ovate, oblong or obovate, inclined or arcuate. 



Paraphyllia subulate, cilia short H. Canadense, 568. 



Paraphyllia ovate-lanceolate, cilia equaling the seg- 

 ments H. molluscum, 389. 



H * Leaves serrate or denticulate only above the middle. 



Capsule arcuate or incurved cernuous, stem leaves plicate, 



plants large (to 15 cm.) . . . . H. Crista-castrensis, 389. 

 Capsule incurved cernuous, stem leaves not plicate. 

 Plants large (to 10 cm.) . . H. cupressiforme tectorum, 395. 



1 See Appendix, nos. 54&-550. 



2 See Appendix, nos. 573-575. 



3 H. Renauldii Kindb., Appendix, no. 571, falls here, but characters given do not allow 

 it to be separated in the key. 



