REVUE BRYOLOGIQUE 91 
by Mr Nicholson in 1910, and sent me by him as probably a form 
of Eucladium verticillatum. After much hesitation I suggested 
pureus,which Mr Nicholson agreed,was a more probable solution. In 
view however of the scantiness ofthe material, the sterilecondition 
ete., the matter was not pursued further, and had indeed passed 
from my mind. During a fortnight spent at Baveno in April of 
this year I was struck with a small moss growing exclusively on 
the mortar of a shaded granite wall; it was entirely sterile, in 
smooth, dense little tufts, which were however soft and easily 
broken off, and were then very conspicuous in the pale yellowish 
brown colour of the interior, forming a strong andstriking contrast 
with the deep green exterior; this was a perfectly constant cha- 
racter. I was at once reminded of Mr Nicholson’s moss, and then, 
recollecting that his was gathered at Baveno, I felt convinced 
that 1 had the same thing, and gave it further study. The moss 
was to be found along the wall for a hundred metres or 50, always 
confined to the mortar, and exhibiting no variation whatever 
except some slight differences in height. I saw it nowhere else, 
until a week or more later I found it on a wall at Lugano, growing 
under precisely similar circumstances, and presenting an exactly 
identical appearance. Here it was growing with a small, xerophy- 
tic form of Ceratodon purpureus, but apart from a somewhat simi- 
ilar superficial appearance, the two plants presented no further 
resemblance whatever. 
After careful microscopie examination, and after submitting 
it to Dr Marchese Boltini for his opinion, we have decided to des- 
cribe itas new: but while I have little doubtthatit is an undeseri- 
bed species, it is a very different matter, in the absence of fruit, to 
determine with satisfaction the genus to which it properly belongs. 
Dr Botlini points out that several of the characters are inconsis- 
tent with those of Eucladium; viz.the frequent though not cons- 
tant presence of a small central strand, the less incrassate peri- 
pheral cells of the stem, the absence of a ventral band of stereid 
cells in the nerve, and the recurved margin of the leaves. In 
. spite of these differences he agrees that it may be provisionally 
placed in Eucladium. The grounds for including it there are the 
general appearance and foliation, together with the upper areola- 
tion and general character of the leaf; the upper part of the 
leaves, apart from the recurved margin and strongly excurrent 
nerve bears a very close resemblance in both form and structure 
to that of E. verticillatum; and it is difficult to see in what genusit 
can better be placed. It is of course abundantly distinct, speci- 
that it might possibly be a small, dense form of Ceratodon pur- 
