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48
NEW BRITISH LICHENS.
By the Rev. James Cro.mbie, M.A., F.G.S.
No. I.
Amongst many rare and previously undetected British Lichens met
with in the course of my botanical rambles, during the last three years,
the following neio 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 ' Elora ' 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. PyrenopHis Jwmceopds, Nyl. ; thallus brown, thin, effuse, sub-
granulose ; apothecia concolorous, lecaiioriue, small epitheciura colour-
less, paraphyses slender; spores 0011-18 mm. broad, O'007-IO ram.
thick ; hymeneal gelatine reddish vviue-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.
It is allied to P. grumnliftra, Nyl., a Scandinavian species, from
which it is sufficiently distinguished by the above characteristics.
2. Lecidea suhturyidula, Nyl. ; thallus greenish-white, very thin,
effuse ;
apothecia more or less livid, opaque, convex, small, imraarginate,
hypothecium brownish ; spores 8 in thecal, colourless, oblong, simple
or slightly 1-3-septate, 0'008-14 mm. long, 0-003-4 mm. thick, pa-
raphyses not discrete, epithecium yellowish-wliite ; hymeneal gelatine
blue, and then yellowish with iodine.
On the decaying wood of an old decorticated Holly in the New Forest,
near Lynd hurst 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. apochroeella, N\l., a species
not yet detected in Britain.
3. X. mfudida, Nyl. ; thallus greyish, thin, depressed, subgranulate
or evanescent ; apothecia black, minute, plane or convex, numerous
and crowded, usually imniargin;ite, colourless within; spores 8 in