380 REVISION OF THE BRITISH COLLEMACEI. 
in southern China is therefore sation Rgrearyne I should 
mention that Dr. Trimen informs me that in the herbarium of the 
ose Perenys there is a Scirpus collected in the Chinese province of . 
Shan by Sir George Staunton, and labelled S. trigueter; but 
he nails * that the specimens are imperfect, and that he cannot si sure 
they are properly-named. 
REVISION OF THE BRITISH COLLEMACEI. 
By tue Rey. J. M. Cromwsre, F.L.S., &c. 
In many respects the species belonging to the family of the Collemaces 
are amongst the most intricate, and perhaps the least understood, of 
any in British Lichenology. This no doubt is owing partly to, 
specific differences being in some cases not very readily perceptible, 
partly to the difficulties connected with confusion of synonomy by 
resting and aise give the following dati derived Sagi 
ica : 
Nylander. Though in the number of species and varieties to be re- 
corded, some of which haye not yet been detected elsewhere, Great 
1 favourably with other European coun- 
e 
tries, there are at the same cecal Continental species. absent from 
our list, some of which further research will no doubt. bring to light. 
Probably also some representative of the genus Pterygium may yet 
be detected amongst the Scottish Grampians, , thoug Omphalaria 
evidently does not extend so far to the north, nor Phylliscwm so far to 
the south, as any parts of our islands. It is certain, however, that 
— hs limits . ny family are extended by the ‘definite reception 
of many of. the ‘‘ pseudo-algze ” our r Lichen-Flora will receive, from 
h $ 
the arrangement of Nylander, giving also the different spotione. 
stirpes into which his genera have been or may be divided, ase whic 
here, as elsewhere, encreapond so far unto, though much more nav” 
than the so-called genera of most Continental lichenists, the “imp 
clature of which es. its chief claim to be preserved § imp'y 
memorig causa 
Tribe I. Lichin 
There can now be little doubt one ws of the filamentow™ 
** Algoe,”’ as originally suggested by Nylander ( vid. also Cromb. 2) 
the Lichen-gonidia Question,” in Popular Science Review, puget 
are referable to this tribe, though, being ager known only ia 
undeveloped or barren state, ~ cannot gerd: be ace urately 0° 
‘specifically described as lichen oT 
I. Gonionema, Vyl.. To “this genus belong various series 
