NEW AND RARE MOSSES FROM THE WEST OF SCOTLAND 179 



cells at base large, oblongo-hexagonal, with thin walls, but 

 merely oblong nearer the margin, all hyaline, .O4-.O6 by 

 .01 -.01 3 mm., above, at first shorter and oblong, passing 

 gradually into the obscure, large, upper, generally hexagonal, 

 but often bluntly quadrate cells, .OO9-.OI4 mm. diam., densely 

 and minutely papillose back and front. Connel Ferry, 1905. 



According to the description by Dr. Braithwaite, vol. i. 

 pp. 243, 246, this cannot be either T. angustifolinm or T. 

 lutescens (Lindb.). 



In 1903, Mr. D. Haggart sent me from Glen Lochy, 

 Killin, a Rhacomitrium which, owing to the papillosity of the 

 leaves, and long teeth of the peristome, nearly as long as 

 the capsule, was referred to R. canesceus. The leaves, how- 

 ever, are quite muticous, and even slightly rounded as well 

 as slightly hollow at apex. But what is most remarkable is 

 the areolation of the leaf, which is that of R. hetcrostichuvi, 

 viz., in upper half the cells are green-chlorophyllose, at first 

 short and constricted in the middle, while nearer the apex 

 they are quadrate, .OO7-.OI mm. across. 



I think it right to call attention to this moss. Mean- 

 while, it may be named R. consodans. 



Another Rhacomitrium has similar peculiarities. It 

 resembles in habit what I have described, in the " Annals " 

 for April 1902, as R. amblyphyllum. The two have in 

 common blunt apices to the leaves, where the breadth at the 

 junction of hair with pagina varies from .12 to .25 mm., but 

 in this the areolation is entirely that of R. microcarpuin, inas- 

 much as the cells near and at apex are sinuose, .OI4-.O25 

 by .005-7 rnm. Let this be named R. divergens. 



This moss has been discovered in many places in the 

 West of Scotland and Western Islands. 



As I have said in a previous paper, I am anxious to call 

 attention to such peculiarities of structure, inasmuch as they 

 seem to indicate departures from the usual conditions of 

 organisation, which may have important bearings on the life- 

 history of the plants themselves. 



The genera which I have studied more closely as showing 

 stronger tendencies to such departures from the normal, are 

 Campylopus, Dicramnn, Griimnia, and the near ally of the 

 last, Rkacomitrium. 



