MUSCI. SPHAGNACE, 339 
alpina and Webera polymorpha must also disappear from the 
list, both records being probably erroneous. Restriction of habitat 
to one or few formations is more marked in the mosses than in 
the phanerogams of the County. As many as 49 species 
are found on the limestone alone, 18 on both limestone and 
Permian, one on Permian only, making a total of 68 limestone 
mosses, though it should be mentioned that some of these species 
are by no means restricted to limestone in England generally. 
36 species are found only on the grit, and four on both grit and 
sand. The Sphayna have none of them been recorded, so far 
as I know, from the limestone. 
It may be worth remarking on the presence or otherwise of 
certain genera in the County. The Andreea are rare ; apparently 
they require the proximity of high mountains in order to flourish 
well. No Buabaumnia has yet been discovered, whilst Seliyeria is 
well represented, all but one species being found. The list of 
Dicrana is poor, and though the genus contains species inhabiting 
all altitudes, there are but few to be found in Derbyshire. 
The Rhacomitria again are not so plentiful as might be expected. 
As regards the Orthotrichacew tree mosses are very and in- 
explicably scarce in the county; few of any interest are recorded 
except about Matlock. Neither are there many members of the 
orders Leucodontacee and Leskeacee to be found. Very little 
of the surface level being over 2,000 feet alpine species are rare 
in their occurrence as a rule, and the County being far from 
the sea maritime mosses are also mostly not in evidence. The 
absence of certain species (if really absent) is not easy to 
understand, such, e.g., as Bartramia ithyphylla, Grimmia orbicularis, 
DBrachythectum salebrosum (type). 
1. SPHAGNACEA. 
SPHAGNUM Dill. 
S. fimbriatum ils. 
Swamps, marshy margins of pools. Rather rare. 
First records, Phyt. N.S., 1858; The Naturalist, 1886. 
