248 BULLETIN OP THE tJNIVEESITT OP WISCONSIN. 



Auricles distinct. 

 Leaves usually denticulate . . . . H. nncinatnm, 382.. 

 Leaves entire or obtusely sinuolate. 

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

 Various, costa 3O-60;U broad, capsule oblong H. adnncnm,^ 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. cnrTifolium, 396. 

 Alar cells inflated, hyaline, thin walled . . H. Patientise,^ 57^^ 



* * Capsule not costate when dry. 



-i— Leaves quite entire. 



[M. imponens and S. subimponens may be sought here.l 



Alar cells dilated, hyaline or yellowish.' 



Cilia 2, nodulose H. Dieckii, 577. 



Cilia 3 H. callichronm, 393. V 



Alar cells not dilated. 



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



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



-)- -y- Leaves serrate or denticulate all around. (•)— -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, 668^ 

 Paraphyllia ovate-lanceolate, cilia equaling the seg- 

 ments H. mollnscam, 389. 



•»--:—•)— 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. cnpressiforme tectornm, 395. 



1 See Appendix, nos. 546-550. 

 ' See Appendix, nos. 573-575. 



^ JT. Renauldii Kindb., Appendix, no. 671, falls here, but characters given do not allow 

 it to be separated in the key. 



