48 
NEW BRITISH LICHENS. 
By tHe Rev. James Cromsiz, M.A., F.G.S. 
No. 1. 
Amongst many rare and previously undetected British Lichens met 
with in the course of my botanical rambles, during the last three years, 
the following new species have rewarded my researches. They have, 
with one exception, been named by Dr. Nylander, of Paris, and have 
been duly recorded by him in the ‘ Flora’ for 1868. As several of 
them are from well-known localities, such as Ben Lawers and the New 
Forest, which have been repeatedly searched by some of our ablest - 
Lichenologists, it is evident that Great Britain is still far from being 
exhausted, and that many hitherto undescribed species will be detected 
on further investigation. 
1. Pyrenopsis homeopsis, Nyl.; thallus brown, thin, effuse, sub- 
granulose ; apothecia concolorous, lecanorine, small epithecium colour- 
less, paraphyses slender; spores 0°011-18 mm. broad, 0:007—10 mm. 
thick; hymeneal gelatine reddish wine-coloured or yellowish wine- 
coloured with iodine. 
On micaceous boulders above Loch-na-Cat on Ben Lawers. August, 
1867. Apparently very rare, and seen by us only in small quantity. 
lt is allied to P. grumulifera, Nyl., a Scandinavian species, from 
which it is sufficiently distinguished by the above characteristics. 
2. Lecidea subturgidula, Nyl.; thallus greenish-white, very thin, 
effuse ; apothecia more or less livid, opaque, convex, small, immarginate, 
hypothecium brownish ; spores 8 in thecæ, colourless, oblong, simple 
or slightly 1-3-septate, 0°008-14 mm. long, 0:003—4 mm. thick, pa- 
raphyses not discrete, epithecium yellowish-white ; hymeneal gelatine 
blue, and then yellowish with iodine. 
On the decaying wood of an old decorticated Holly in the New Forest, 
near Lyndhurst Railway Hotel. May, 1868. Very rare, and found 
sparingly only on a single tree, notwithstanding a somewhat extended 
search. Its systematic place is near to L. apochreella, Nyl., a species 
not yet detected in Britain, 
3. L. mestula, Nyl.; thallus greyish, thin, depressed, subgranulate 
or evanescent; apothecia black, minute, plane or convex, numerous 
and crowded, usually immarginate, colourless within; spores 8 
