32 ME. TV. MITTEN — EEYOLOGIA OF THE STTEYEY 



mixed with a fertile state of H. uncinatam, this species would 

 appear to be a little larger than that found in the mountains of 

 Switzerland and distributed by Schleicher as JPterogonium stri- 

 atum, and since named by De ~Notdir\s Lescurea insignis ; but in this 

 the leaves are more concave. 



The relative position of the species constituting the group known 

 as Lescurea, Schimper, to Ptyclwdium ejusd. is precisely the same 

 as that of JPylaiesia, Schimp., to Hypnum cupressiforme and of 

 LLomalothecium to Camptoihecium and Lracliyihecium, the sum of 

 the differences being only in a more erect capsule and less perfect 

 peristome — distinctions which may serve for the arrangement of 

 the species, but can scarcely be admitted as of generic importance 

 when considered by the light afforded by the very natural group 

 JPlagiothecium and Amblystegium, Schimp., and also by the modi- 

 fications in the peristome of Bryum. 



All the yet described species of Lescurea and JPtycliodium agree 

 in the substance of the leaves and in the presence of paraphylla. 



(Brachytlieciwn, Schimp .)' 



H. albicans, Neck. 



Hab. Rocky Mountains, Bonrgeau. 



H. SALEBROSUM, Hoffm. 



Hab. Saskatchewan, Bourgeau ; Fort Colville and Pend Oreille River, 

 Lyall. 



H. collinum, Schleich. 



Hab. Cascade Mountains, British Columbia, Lyall-, collected also in 

 British N. America by Drummond. 



H. cedipodium, sp. nov. Monoicum, caule procumbente subpinnato 

 rarnis decurvis radicantibus, foliis late ovatis acuminatis, nervo medio 

 evanido, marginibus serrulatis, cellulis oblongis elongatisque ad an- 

 gulos decurrentibus pluribus quadratis, perichsetialibus convolutis 

 late ellipticis acuminatis apice serrulatis enerviis, theca in pedunculo 

 crassiusculo sulcato minute scabro nutante ovali inaequali, operculo 

 conico, peristomio normali ciliis duobus appendiculatis. 



Hab. Lake Huron, Todd, and sent from the United States by Cooley ; 

 Pack River and Rocky Mountains, Lyall. 



Stems loosly csespitose. Leaves pale green and subcompressed, 

 those of the ramuli more sharply serrulate ; areolation soft and 

 loose ; cells generally chlorophyllose. In appearance this species 

 has some resemblance to H. Starkii, and agrees with it in its thick 

 seta and the appearance of the capsule ; but the substance of the 

 leaves is far different, and in drying they do not become striated. 



