146 ADDITIONS TO THE BRITISH LICHEN FLORA. 
4 
mann’s convenient term, used by Mr. Baker in his ‘‘ North Yorkshire”) 
in a less degree than ‘the last, compact and non-absorbent, yet 
ble i | 
for many xerophilous plants with a montane restrictio 
Between these two formations as to Ren position, north 
vs the seal diuteict, the peat} masses of gritstone are at the surtace, 
yh in part sh ag such as the Rowan tree, Geranium 
pratense, Myrrhis, Foxglove, the Seitibe and numerous Ferns, 
flourishing with such peculiar vigour as to constitute them charae- 
teristic plants. This gritstone rock is eugeogenous, but varies some 
n 
half where the flagstone predominates, and a colder more humid | 
obtains, with a verte a and more stunted vegetation, in which Fir, : 
Beech and Elm do n : 
Lastly, as the ph rock of the coal measures we have the 
shales and clays of various constitution, but all of f them very — 
absorbent, and Diseases ed in such a way that water percolales 
through on ane least Pendlily : and being retained results in @ cold, 
heavy, wet soil, with the most meagre flora of any pa art 0 
ng. 
e have, ay over wer Oe qonlfigid aaa all the lithological charac 
ed to the most 
ccieune. ay coalfield glens, and comparatively a 
th in species and individuals in the dry calcareous districts. i 
thus see that the plants (flowering and flowerless) of the coal pg 
are such as prefer, or are most indifferent to, cold and damp sh 
and heavy wet soil. 
RECENT ADDITIONS TO THE BRITISH LICHEN FLOR : 
By rae Rev. J. M. Cromer, F.L.S., &c- 
te 
r new ones not yet dese rae hav gee: to be Sie 
ne toviana(Hepp. Flecht., No. 92). On cha 
P- by he 
in a pit near Gomshall, i in Surrey, bounty. (Crombie) ; a. 
* 
