220 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



B. Teeth of the leaves in pairs. 



[.M". Jilyttii may be sought here.] 



Costa vanishing below the apex . . . . M. hornum, 245. 

 Costa percurrent or excurrent. 

 Capsules solitary. 

 Synoicous. 



Leaves decurrent M. serratum, 1 245. 



Leaves not decurrent or only indistinctly so . M. Niagara, 352. 

 Dioicous. 

 Costa excurrent in upper leaves, leaf cells 18-30//, 2 



plants 1.5-2 cm. high . . M. pseudolycopodioides, 351* 

 Costa percurrent. 

 Lid not rostrate. 



Capsule with long neck, wide mouthed M. inclinatnm, 350. 

 Capsule oval, inclined . . . M. decurrens, 349. 



Lid rostrate. 



Leaf cells small, about 15/* s . . M. orthorrhynchum, 246. 

 Leaf cells very large, 50-60/* 4 . . . M. umbratile, 246. 

 Capsules clustered. 5 

 Dioicous, leaves strongly crispate, capsule horizontal 



or inclined M. spinosum, 246. 



Synoicous, leaves not crispate, capsule pendent M. spinnlosum, 247. 



II. Leaves entire. 



Upper leaf -cells with long diameter oblique to costa. 

 Leaves bordered. 



Costate to apex, dioicous, capsule oblong . M. pnnctatnm, 248. 

 Costa vanishing, synoicous, capsule subglobose, leaves 



distinct and few M. subglobosum, 248. 



Costa vanishing, dioicous, leaves more abundant and 



closer M. hymenophyllum, 354. 



Leaves not bordered, costa vanishing, dioicous, capsule 



ovate-oblong M. cinclidioides, 248. 



Upper leaf-cells isodiametric, costa vanishing M. hymenophylloides, 249. 



M. heterophyllum Schw. is mentioned as occurring in America (Bryol. 

 Eur. Mnium, p. 24), but no locality is given and for this reason it is not 

 included in the key and descriptions. 



1 See Appendix, no. 348. 



2 As determined from Can. Musci, no. 197. 

 8 Fide Husnot : Muscol. Gall. 255. 



4 Cells four times as large as M. orthorrhunchum, fide Mitten, Journ. Linn. Soc. 8: 30: 

 6 M. macrociliare may be sought here See footnote 2, p. 219. 



