248 BULLETIN OP THE UNIVERSITY OP WISCONSIN. 



Auricles distinct. 

 Leaves usually denticulate . . . . H. unciuatum, 382. 

 Leaves entire or obtusely sinuolate. 

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

 Various, costa 30-60/^ broad, capsule oblong H. aduiicum,^ 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. cnrvifolium, 396. 

 Alar cells inflated, hyaline, thin walled . . H. Patientiee,* 572. 



* * Cajosule not eostate when dry. 



■I— Leaves quite entire. 



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



Alar cells dilated, hyaline or yellowish. ^ 



Cilia 2, nodulose H, Dieckii, 577. 



Cilia 3 H. callichroum, 393. 



Alar cells not dilated. 



Cells uniform throughout leaf . . . . H. AVatsoni, 386. 



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



-1— -i- Leaves serrate or denticulate all around. (•)— -h- -i-) 



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. molluscnm, 389. 



-)—-)- -1— 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. 



J See Appendix, nos. 546-550. 

 ^ See Appendix, nos. 573-575. 



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

 it to be separated in the key. 



