. 896 Mr. Hooxur’s Observations on Andrea. 
been observed only by Mr. Borrer and myself upon the rocky 
summit of Ben Nevis, a mountain scarcely to be equalled by 
any other in Great Britain for the richness and rarity of its ve- 
getable productions, particularly in the order of Musci, and 
which, from its vast extent, must be as yet but partially explored 
by the Cryptogamic botanist. | 
A. nivalis produces capsules in the month of July, but spa- 
ringly, although the male fructification is to be found in plenty at 
that season, and is easily distinguishable from the rest of the 
plant by its paler colour Barren specimens, and especially the 
variety B, have very much the appearance at first sight, both in 
the mode of growth and colour, of Mr Dickson’s Jungermannia 
adunca, but the slightest examination of the leaves with a com- 
mon pocket lens will be sufficient at once to distinguish them. 
Its nearest affinity is with the preceding species, from which it 
may always be known by its far greater size and different colour, | 
by the similarity of the. perichetial leaves to the cauline ones, 
and by these latter, which are much broader and by no means 
subulate, so that the nerve’ is furnished on each side with a 
considerable portion of the leaf to the very apex, whereas in 
A. Rothii it occupies towards the apex almost the whole breadth 
of the leaf. The pedicellus too bas a peculiarity that I have not 
observed in any other species, in its base where the barren pis- 
tilla are situated being incrassated into a sort of bulb. - 
ExPrANATION or Tas. XXXI. 
Fig.1. Anprxa alpina. 
a. portion of a branch, magnified . . . . . ep nb 
b leaf . . on ur lI 5 
= c. exterior 
