36 MR. W. MTTTEK — BRYOLOGIA OF THE SURTEY 



H. lentum, sp. nov. Dioicum, foliis patentibus laxe imhricatis, in 

 apicibus ramorum cuspidato-imbricatis, inferioribus latioribus bre- 

 vioribus in ramorum medio ubi fructus proferunt late ovatis aeumine 

 brevi, in ramulis attenuatis ovato-lanceolatis apicibus latioribus obtu- 

 sioribus, marginibus tenuiter in ramulinis argutius serrulatis nervo 

 ultra medium evanido, cellulis basi ad angulos pluribus latioribus 

 angustioribus immixtis parietibus crassiusculis, superioribus angustis, 

 quasi apicibus dorso prominulis, in apice oblongis, perichaetialibus 

 enerviis e basi ovali amplexante subulatis recurvis subintegerrimis, 

 theca in pedunculo unciali scabro ovali cylindracea suberecta inaequali, 

 peristomio interno processibus solidis ciliis singulis subsequilongis in 

 membrana ad dentium tertiam longitudinis exserta. 

 Hab. N.W. coast of America, Douglas. 



Of this moss only a few fragments have been seen. It appears 

 to be about the size of the common forms of H. inyurum, but of a 

 loose spreading habit. 



At first it was supposed that this was only a state of H. aplo- 

 claclum ; but the decidedly rough seta and wider leaves, those of 

 the perichsetium spreading, render it distinct. The scabrous seta 

 of this moss may be considered a new feature in the group of 

 species to which it is here referred : but after a consideration of 

 the characters which constitute the group Isothecium, it becomes 

 evident that it cannot be defined distinctly from the groups 

 named by Schimper Brachythecium and Scleropodium ; for the 

 habit, which is the most evident characteristic of Isothecium, is 

 only more conspicuous among the species forming that group 

 than it is in Brachytliecium, in which it is essentially the same ; 

 and the only difference between these groups is the plication of 

 the leaves, chiefly when dry, in the group Brachytliecium, which in 

 Isothecium and Scleropodium is less evident, and is thus a transi- 

 tion to the group Bhynchosteyium, which have the leaves more 

 smooth. 



(Eurhynchium, Schimp.) 



H. Oreganum, Sullivant, in U. S. Expl. Exped, t. 13. H. Douglasii, 



Hook. MS. 

 Hab. British Columbia, near the 49th parallel, Lyall; Vancouver 



Island, Wood. 

 Some specimens of this noble species were more than a foot long. 



H. pr.eloxgum, Dill. H. Stokesii, Turn. 



Hab. British Columbia, near the 49th parallel, Lyall; Vancouver 



Island, Lyall and Wood. 

 This much misunderstood species has a very wide distribution, 

 and is found in the Andes. 



