42 
NEW BRITISH HEPATIC^. 
that species the fronds are broader and shorter, generally bilobed, 
the lobes obovate to obcordate, channelled above, but thick and 
prominent beneath, surrounded with a broad membranous margin 
fringed with large obtuse cilia. 
The fronds of B. glaucescens are about to in length by 
" to in diameter, resembling the large form of B. glauca in 
size and colour, but in it the fronds are thinner, of the same colour 
on both surfaces, and the margin entire. 
67. Riccia tumida. Ldg. 
Fronds minute, crowded, thick and fleshy, oblong -pyriform, 
obtuse, remarkably narrowed at the base, margins tumid, covered 
with purple scales, and fringed with a double row of lanceolate 
cilia ; capsules immersed, spores small, papillose. 
From B. ciliata this is distinguished at once by the form of 
frond, purple scales, and double row of cilia. 
In B. ciliata the segments are regularly furcate, more densely 
ciliated, linear-cuneiform, texture thinner, and both surfaces pale 
dirty green ; whilst B. glaucescens may be known by the larger 
size, acute edges of the fronds, and less crowded ramification. 
According to Lindberg. this is the Biccia minima glauca , seg- 
mentis augustioribus , ad margines pilosissimis, Nov. Gen. PI. p. 107, 
n. 3, t. 57, /. 6. 
First collected in Britain by Wm. Joshua, Esq., near Monmouth, 
May, 1877. — B.C. 
76. Gymnomitrium crassifolium. Carr. 
Tufts pulvinate, stoloniferous, nearly black when dry ; shoots 
radiculose on the under surface, erecto-decumbent, irregularly 
innovant, ramuli ascending, sub-terete, the fertile ones clavate ; 
exstipulate ; leaves imbricated, erecto-secund, about twice the 
breadth of the stem, obliquely clasping, orbiculate, acutely emar- 
ginate, concave, segments short inflexed, sinus angular, of thick 
texture, scarcely altered when dry, minutely papillose, areolation 
dotted, sub-opaque, margin entire (not scariose) ; outer involucral 
leaves much larger, free, cleft for half their length into two 
obtusedly-pointed lobes ; inner involucral leaves shorter, connate, 
laciniate-dentate ; capsule spherical, pedicel short. 
Hab. First collected at Craig Oognach (?) near Ben Lawers, in 
1848, by A. 0. Black. 
The Ptarmigan, Perthshire, August, 1878, fertile, C. J. Wild. 
Note. — G. crassifolium formed part of a collection of Hepaticae, 
made about 1848, in the neighbourhood of Ben Lawers, by Dr. A. 
0. Black, and which came into the possession of Dr. M. C. Cooke. 
Mr. Wild , who was fortunate enough last summer to stumble on 
it — literally, since it was after a fall producing severe injury to 
the knee, and making frequent rests necessary, that this gentleman 
collected the species — described it as growing “ in broad black 
patches on damp soil, with the habit of Anthe.lia julacea .” For a 
long time l mistook it for a form of Nardia Funckii , although 
noticing the more creeping habit, longer rootlets, and duller 
