NEW VARIETIES OF BRITISH MOSSES 879 
consider them as forming an independent species, and possibly to 
refer them to a different genus. It fortunately happens, however, 
that side-lights thrown on the question by some other plants prove 
that this would have been an error. In the Ben Laoigh plant, 
which is the best-marked form of those cited above, and to onl 
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upper cells are frequently slightly papillose; not so markedly nor 
so constantly so, I think, as to justify its being placed under the 
present variety, but sufficiently to connect the variety indisputably 
with the smooth-leaved typical plant. The same is the case with a 
Ferg., which in my opinion belongs to the same variety. The 
smoothness of cells attributed to Ditrichwn must therefore be 
considered as not absolutely constant, at any rate In the short- 
celled species. 
a var. of D. homomalium. Among 
these are the usually shorter and less finely subulate leaves, the 
shorter, often subquadrate cells, and especially the channelled, sub- 
tubular leaf-apex, which in D. homoma/lum is concave, but not with 
the leaf-margins incurved and subtubular as here. The whole width 
as. In large masses, on rocks by a stream, Quiraing Hill, 
Skye, 1898 (Dixon) ; (I have also a specimen from Quiraing, Skye, 
