144 
NEW ARRANGEMENT OF 
the industry of various botanists. Dickson added several 
to the British list : Mr Turner, to whom muscology owes 
so much, describes nine species as natives of Ireland, in his 
excellent " Muscologise Hibernicae spicilegium and Sir 
J. E. Smith, in his " Flora Britannica,*" and also in his sub- 
sequent and more valuable work, the Compendium of the 
former, enumerates seventeen. Drs Hooker and Taylor, 
having examined them with the utmost microscopical ac- 
curacy, found it necessary in their " Muscologia Britan- 
nica*,'' to reduce that number to eleven. In the mean 
time, Hedwig, on the Continent, including a species from 
North America, raised the original number to twelve. 
ScHWiEGRiCHEN, in his Supplement, describes seventeen ; 
and, latterly, Bridel brings as many as twenty-seven spe- 
cies under Phascum^ and two under Pleuridium, thus 
making no fewer than twenty-nine. Of these it is sufficient 
to say, that thirteen only can be established as good spe- 
cies. There is, however, one more (P. FlorTceanum^ with 
an English variety, P. stellatum^ Brid.), but which, until we 
see better and more decided specimens than those at pre- 
sent in our possession, we cannot help thinking too closely 
allied to P. muticum, and its varieties, — a circumstance 
also noticed in the " Muscologia Britannica." Two spe- 
cies, as already mentioned, have been lately added; one 
by Dr Hooker, in his beautiful " Musci Exotici," the other 
by HoRNSCHUCH in the " Horae Physicae Berolenses;" so 
that at present only fifteen species can be enumerated of 
this extremely minute genus. 
* This most excellent work is, we know, out of print ; but we hope the 
public will speedily be favoured with another edition, which cannot but ac- 
quire an additional interest with the British muscologist, from the new ma- 
terials that will enrich it. 
