36 The Scott is J i Naturalist. 



from half an inch to two inches, radiculose, especially in lower 

 half ; leaves rather densely disposed, somewhat clasping, in a moist 

 state, erect, and not undulated on margin, which is recurved in lower 

 half, when dry, crisped, linear, and not expanded at base, acute or 

 sub-acute at apex ; nerve roundish and prominent on back, flat in 

 front, not quite reaching apex ; areolation in the lowest third pel- 

 lucid, composed of oblong rectangular cells, which gradually 

 merge, in a transverse direction, into the dense opaque papillose 

 areolation of the upper two-thirds. This papillosity is shown on 

 margin of leaf as well as on back of nerve. 



This moss is closely allied to D. cylindricus in the minute 

 structure of its leaves ; but their length is only half as great, and 

 their breadth near the base somewhat less than in those of 1). 

 cylindricus ', while the breadth of the leaves of D. Daldinianus is 

 double that in either moss. D. cylindricus is altogether a much 

 smaller plant, and is certainly not tufted like the moss under dis- 

 cussion. 



The second moss was found in August in Harris, in the Outer 

 Hebrides. It is a Grimmia, and is almost the only representative 

 of the genus found there. 



Grimmia subliirida sp.n. is densely ctespitose, or rather pulvin- 

 ate, and fastigiate ; stems simple or sparingly dichotomously 

 branched, about an inch in height in the centre ; leaves broadly 

 lanceolate, acute, with short, smooth hair-points, margin recurved 

 in lower half on one side, plane, or only slightly reflexed on the 

 other ; areolation coloured throughout, not pellucid, long and 

 narrowly sinuous near base, as well as in parallel rows more shortly 

 so upwards, near apex dotlike, but having the cells very often con- 

 stricted near the middle ; nerve prominent on back, hollow in front. 

 Some leaves are seen, under the microscope, to be bluntly papil- 

 lose on margin near apex. 



Barren ; on rocks at or near sea-level. 



This moss has perplexed me considerably. It has several of the 

 characteristics of Racomitrium sudeticum ; but its densely tufted 

 condition, &6., decided me, in the absence of fructification, to 

 separate it from this genus. The other species of the genus 

 Racomitrium are largely, even profusely, represented in Harris; but 

 the genus Grimmia scarcely occurs, if it occurs at all, so far as I 

 can recall the facts. 



The following is a somewhat more detailed description of a moss 



