26 MR. W. MITTEN — BRYOLOGIA OF THE STTRYEY 



O. canum. Humile, foliis patentibus elliptico-lanceolatis nervo carjnatis, 

 marginibus recurvis reflexisve, apicem versus plus minus erosulis 

 apice diaphanis, superioribus pilo brevi hyalino fragili terminatis, cel- 

 lulis basi paucis oblongis quadratisque, inde ad apicem rotundatis 

 granulosis grossiusculis, perichsetialibus ovatis subacutis, tbeca emer- 

 gente ovali-C) lindracea plicata, operculo breviter acuminato, peristomio 

 dentibus bigeminatis ciliis subulatis basi e serie duplici cellularum 

 compositis interpositis, calyptra totam fere thecse obtegente breviter 

 ramentosa. 



Hab. British N. America, Drummond. 



Different from O. diaphanum, Schrad., in the form of its leaves, 

 and in appearance more nearly like O. pumilum, Schw., which has 

 differently shaped r le s, also tipped with a minute hyaline 



fragile mucro. 



Ulota, Br id. 



U. PHYLLANTHA, Brid. 



Hab. Vancouver Island, Wood. 



U. Americana. Monoica, foliis siccitate tortis appressis e basi sub- 

 ovali longe lanceolatis sensim acutis nervo carinatis, marginibus re- 

 curvis, ssepe suberosis, cellulis basi ad margines seriebus circiter tribus 

 hyalinis oblongis, in medio angustis luteis, superioribus rotundatis 

 diametro circiter 7 ¥ Vo unciae metientibus, perichsetialibus apice latio- 

 ribus obtusiusculis, theca elliptica plicata, operculo conico acuminato, 

 peristomio dentibus bigeminatis 8, ciliis sequilongis angustis 8, ca- 

 lyptra breviter appresse ramentosa. 

 Hab. Lake Huron, Todd ; British N. America, Drummond, no. 153, with 



U. Bruchii as U. crispa. 

 Differs from IT. curvifolia, Wahlenb., in the areolation of the 

 base of the leaf, and from TJ. crispa, Hedw., and JJ. crispula, Hsch., 

 in the same particular, as well as in the form of the base of the 

 leaves. The space of a thousandth part of an inch in the middle 

 of the lanceolate part of the leaves contains in IT. crispa two cells, 

 in TT. crispulum two and a half, in TJ. Americana three cells. 



U. Barclayi. Monoica, caespitosa, humilis, foliis patentibus siccitate 

 appressis e basi excavata subrotundata late lanceolatis acutis, supe- 

 rioribus acutatis, nervo carinatis, marginibus convexis integerrimis, 

 cellulis basi ad lateras oblongis in seriebus pluribus hyalinis, inte- 

 rioribus paucis elongatis luteis, superioribus rotundatis diametro 

 circiter ^ oVd uncise metientibus, perichaetialibus ovato-lanceolatis con- 

 volutis erectis, theca ovali et collo crasso siccitate plicata, peristomio 

 dentibus bigeminatis 8, ciliis 8 brevioribus interpositis, calyptra bre- 

 viuscula breviter ramentosa. 



Hab. Sitka, Barclay. 



