BRITISH LICHENS

LECIDEA LECIDEACElE 41
Distinguished from others in this group by the smooth, subdeterminate
thallus, and by the spores which are thick-walled and very
distinct.
Hab. On the bark of trees.-Distr. Seen from only a few localities
m S. and W. England and Ireland.-B. lIf. Tregawn, Withiel and near
Penzance, Cornwall; Bovey Tracey, Hustyn's Wood and Torquay,
Devon; Copse below the \Vych, Gloucestershire; Dolgelly, Merioneth;
Castle Bernard Park, Cork; Mangerton, Killarney and Blackwater
Bridge, Iterry; near Ballmasloe, Galway; Mount Shannon, Limerick;
Killaloc, Clare; Achlll Island.
,
53. L. rufofusca Ny!. in Flora Iii. 409 (1869).-Thallus effuse,
whitish-yellow or brownish, thicklsh, forming a granulose crust,
wIth a whitish hypothallus. Apothecia small, dark-red dishbrown,
plane and marginate, becoming convex and immarginate ;
hypothecium yellow; paraphyses concrete; epithecium yellowishbrown;
spores ellipsoid-oblong, 10-15 flo long, 5-6·5 flo thick;
hymenial gelatine wine-red with iodine.-Leight. Lich. Flora
ed. 3, 266. Biatora rufofusca Anzi Catal. Lich. Sondr. 76 (1860).
Exsicc. Larb. Lich. Rb. n. lO2.
Hab. On the bark of trees.-B. },t. Near Kylemore, Connemara,
and Ballyna,hinch, Galway.
54. L. ochrococca Ny!. in Ocfvers. Vet. Ak. Forh. 1860, 297
&. Lich. Scand. 206.-Thallus effuse, thin, granulose, yellowochraceous;
the granules small, firm, contiguous or subdispersed
(K -, CaCI-). Apothecia small or moderate in size, sessile, plane,
at length convex, reddish or rusty-brown, the margin obtuse or
indistmct, paler; hypothecium pale; paraphyses concrete; spores
ol-jlong-fuaiform, 7-10 flo long, 3-4 flo thick; hymenial gelatine
bluish then, expecially the asci, wine-red with iodine.-l\Iudd Man.
194; Cromb. Lich. Brit. 69; Leight. Lich. Fl. 261; ed. 3, 257.
Well distinguished from all allied species by the colours of the
thallus and of the apothecia. It occurs elsewhere only in Norway.
The thallus is occasionally evanescent, when the apothecla appear on
darkencd parts of the substratum. Our British specimens are well
fertile.
Hab. On tho trunks of pine trees in upland tracts of mountainous
regions.-Distr. Very local and scarce in the W. Highlands of Scotland.
--B. III. Inverouran, Argyll; Glen Falloch, Ben Lawers, and Black
Wood of Rannoch, Perthshire; Dinish, KIllarney, Kerry.
55. L. symmictella Ny!. in Flora Ii. 163 (1868).-Thallus
obsolete, developed withm the bark (hypophlceodal). Apothecm
very small, adnate-sessile, convex, immarginate, at first waxyyellow,
then livid, somewhat shming; paraphyses colourless;
epithecium granulose, yellowish; hypothecium colourless; spores
oblong or oblong-ellipsoid, 4-6 flo long, 1·5-2·5 flo thick; hymenial
gelatine bluish with iodine.-Cromb. in Grevillea xxii. 10.
Agyrium c(1}sium Fr. Syst. Myoo1. ii. 231 (1823).