NEW AND RARE MOSSES FROM THE WEST OF SCOTLAND 243 



and short zigzagging of the stems as well as the deep, sharp 

 serratures serve to widen this distance. 



Mollia terrena (Strn.), first found in Tarbert in Harris, 

 and described in the "Annals" for July 1900, was detected 

 in several places in the neighbourhood of Onich. The long 

 broad acumen in this species, formed by the abruptly rounded 

 narrowing of the long leaf to a fourth of its breadth below, 

 is peculiar, almost unique. The length of this acumen 

 varies from .4 to .7 mm. And its breadth near the middle 

 from .07-. I mm. or about one-fifth of its length. It tapers 

 a little upwards but continues broad to the apex which, 

 however, is often narrowed rather abruptly to a short point 

 by a large, pointed, pellucid cell or by several such of 

 smaller size and then slightly granular. The narrowing 

 nerve penetrates this acumen nearly to its middle, but its 

 breadth there is not more than one-tenth part of that of 

 the acumen. The margin is plane, often undulating and 

 crenulate, while the peculiar marginal serratures extending 

 down to near the base, are also characteristic. 



I am pleased at having another opportunity of describing 

 what can only be reckoned a much greater departure than 

 Griminia fuliginea (described in the " Annals " for July 

 1908) from Rhacomitrium heterosticJmm. In this instance 

 I consider the transition from Rhacomitrium to Grimmia as 

 almost complete. The moss still retains the peculiar greyish 

 colour of the former, but differs from it in almost every other 

 particular in the areolation, in the manner of ramifying, in 

 the configuration of the dense tufts, etc. 



Grimmia subaquila, n.sp. In dense, convex, greyish, 

 hoary tufts ; stems rather slender, for much the greater part 

 fastigiato-ramose in the upper half, but not infrequently, 

 merely dichotomously divided or simple, about one inch long ; 

 leaves closely arranged around stem, flaccid but appressed 

 in a dry state, spreading a little and straight when moistened,, 

 from a rounder, wider and somewhat clasping base, narrowly 

 lanceolate, terminating in a bluntly spinulose hair, nearly a 

 third the length of the leaf proper ; nerve pale, narrow, 

 latit. near base .O4-.O5 mm., tapering upwards to apex ; 

 margin reflexed or even recurved in lower half or a little 



o 



more, breadth of reflexed portion at its widest, .02 5 -.04 mm., 



