— 49 — 



striated; operculum lon.sf-rostrate with an oblique beak, crenulate at base; 

 annulus distinct, peristome deep purple 0.5 mm. long, strongly papillose, 

 teeth irregularly trifurcate; spores, smooth, i6-i8//. 

 From Port Wells (Trelease, 2268, 2271). 



This species is only comparable with C. polycarputii Sch., from which 

 it is easily distinguished by its smaller size, its shorter, smooth or hardly 

 striate capsule; its more papillose, longer and brighter purple peristome; its 

 shorter leaves with a thinner subula, and its upper leaf-cells smaller and less 

 distinct. 



CvNODONTiuM POLYCARPUM Alaskanum Card, and Tber. 



Differs from the typical form in the leaves more strongly denticulate at 

 apex, margins less widely and less longly revolute, leaf cells smooth, or 

 nearly so, upper a little larger and more distinct (20 x 13/^ instead of 14 x 11): 

 distinct from variety laxii^ctc Dixon in the narrower leaves, and more 

 dense areolation. From OncopJiorus succico Arn. and Jens., it differs in 

 having the leaves revolute below, and alar cells indistinct, or nearly so. 



From Juneau (Trelease, 2176); Cape Fox (Trelease, 2374); Indian Camp, 

 Yakutat Bay (Brewer and Coe, 645). 



The type has been indicated for Alaska by Kellogg and by Lesquereux 

 and James (Manual, p. 58). 



DiCHODONTiUM PELLUCiDUM KoDiAKANUM Card, and Ther. 



In size like D . Jiavescens Lindb., 5-8 cm. high; leaves subentire, apex 

 broadly obtuse, somewhat sinuolate, scarcely papillose. 



From Kodiak (Trelease, 1848). 



DiCRANELLA HETEROMALLA LATINERVIS Card, and TllCr. 



Differs from the typical form in having leaves shorter subulate, costa 

 broader, occupying one-third of base. 



From Douglas Island (Trelease, 2389). 

 DiCRANUM suBFLAGELLARE Card, and Ther. 



Nearest to D. flagcl/aj^e, differs in the lack of flagellse, the erect sub- 

 falcate leaves, narrower, little flexuose, shorter (2-2.5 mm.), acumen canali- 

 culate, not subtubulose, margins and back subentire, lower cells narrower, 

 upper much smaller, specimens scanty, sterile. 



From Kodiak (Trelease, 1899). 

 PoTTiA Heimii Beringiana Card, and Ther. 



Differs from the typical form in the shorter leaves, surrounded by a yel- 

 lowish border: mucronate by the shorter excurrent costa, areolation more 

 opaque, strongly papillose. 



From St. Matthew Island (Trelease, 2151 in part). 



We found only a few stems of this moss, mixed with Bai-bula brachy- 

 poda Card, and Ther., and a Bryum. By the pellucid margin of the leaves, it 

 IS nearly related to P. obtiisifolia C. Miill. {P. Heimii arctica Lindb.) but it is 

 easily distinguished from it by its pointed leaves. It also closely resembles 

 Desmatodon systylioides Ren. and Card., from Labrador, which is probably 

 also a Pottia of the same group, but it differs from this species by its ovate, 



