1909] The Ottawa Naturalist. 143 



It is possible that the capsules, when such are found, can 

 give better characters. 



Collected on the shore of Baffin Land, west of Greenland, 

 August 18th, 1904, by Commander A. P. Low. No. 329. 



33. Grimmia grandis. 



Leaves smooth, carinate and ovate-lanceolate acuminate 

 acute, wholly recurved at one side, neither crisped nor appressed 

 when dry; the lower very small; cells not sinuous, nearly all 

 short subquadrate, the alar short-rectangular, costa smo6th; 

 hairpoint faintly rough often longish. Tufts loose, in the upper 

 part green, fuscescent below. Stem to 5 cm. high, much 

 branching, naked below. Capsules and flowers not seen. 



Differs from G. elaiior in the leaves being smooth, etc. ; in 

 G. elata, Kindb., resembling in habit, lower leaf-cells are very 

 long and linear. 



On rocks at the head of Lake Louise, eastern slope of Rocky 

 Mountains, Alta., altitude 6,000 feet, September 13th, 1904. 

 No. 17. 



34. Grimmia (Pseudo-Racomitrium) elata. 



Leaves quite smooth (not papillose as in G. elaiior), ovate 

 lanceolate acuminate-acute, carinate, recurved below to the 

 middle on both sides, neither appressed nor crisped when dry; 

 upper cells quadrate not sinuous, middle suboblong faintly (or 

 not) sinuous, basal long-rectangular, alar wider but generally 

 short-rectangular and often hyaline in several rows ; costa smooth ; 

 hair-point long and denticulate. Capsule (old) oblong, not or 

 scarcely exserted. Dioecious. Plants robust, 3 cm. high loosely 

 tufted (but cohering), brownish with green branch-tips. Habit of 

 Grimmia elatior. 



On rocks along Hunker Creek. Yukon, July 26th, 1902. 

 No.*108. 



35. Grimmia ovat^formis. 



Agrees with G. ovata, Weber & Mohr. Tufts low and com- 

 pact; .capsule small and smooth with straight pedicel; leaves 

 recurved, not large, nearly appressed when dry, the upper narrow 

 with long hairpoint. 



Differs in nearly all leaf-cells very sinuous, the alar long- 

 rectangular; calvptra cucullate; dioecious. 



G. attenuata, C. M. & Kindb., resembles it in leaf-cells, but 

 differs in having larger leaves and also looser and higher tufts. 



On rocks at the head of Lake Louise, eastern slope of Rocky 

 Mountains, Alta., altitude 6,000 feet, September 13th. 1904. 

 No. 19. 



(To be continued) 



