BRITISH LICHENS
BRITISH LICHENS
BRITISH LICHENS
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LECIDEA LECIDEACElE 45<br />
the S. Grampians, Scotland, and N. lreland.-B. ]JI. Cader ldris,<br />
Merioneth; Ben Lawers, Pcrthshire; Morrone, Braemar, Aberdeenshire;<br />
Invermoriston, lnvernessshirc; Armagh; near Belfast, Antrim;<br />
Doughruagh Mt., Galway; Dunkerron, Kerry.<br />
60. L. fuscorubens Nyl. ex Salw. in Trans. Edin. Bot. Soc. vii.<br />
551 (1863).-Thallus effuse, very thin, smooth, sordid-greyish<br />
or yellowish (K -, CaCI - ) ; often obsolete. Apothecia<br />
small, sessile, plane, marginate, then convcx and immarginate,<br />
brownish or black, reddish-brown when moist; hypothecium<br />
thick, brown; epithecium pale-reddish; spores ellipsoId, 10-14 (.L<br />
long, 5-9 (.L thick; hymemal gelatine bluish then wine-red with<br />
iodine.-Cromb. Lich. Brit. 68 pro parte; Leight. Lich. Fl. 300<br />
pro parte; ed. 3,310. L. ochracea Wedd. in Mem. Soc. Sci. Nat.<br />
Cherb. xvii. 369 (1873); Cromb. in Journ. Bot. xiii. 141 (1875);<br />
Leight. Lich. Fl. ed. 3, 251. L. subochracea Nyl. Lich. Env.<br />
Paris Suppl. 5 (1897). Biatom fuscorubens Nyl. in Bot. Not.<br />
1853, 183 pro parte. B. ochracea Hepp Flecht. Europ. n. 263<br />
(1851).<br />
L. fuscorubens was considered by Nylander as possibly a variety or<br />
subspecies of L. sanguineotra (Lich. Env. Paris, 79). It differs in the<br />
absence of the purple hymeuial granules and in other characters.<br />
Th. Fries (Lich. Scand. 440) has rightly judged L. ochracea to be<br />
synonymous. They differ only in the occasional yellowness of the<br />
very thin thallus of the latter. As in other calcicolous lichens, the<br />
thallus is not always visible, being evidently immersed in the rock<br />
(L. ochracea f. ecrustacea Larb. in Leight. l. c.).<br />
Exsicc. Larb. Lich. Hb. nos. 64, 137; Johns. n. 336.<br />
Hab. On calcareous rocks and flints in maritime and upland districts.<br />
-Distr. Common on oolitic rocks and Silurian limestone in W. England;<br />
here and there in the British Isles probably overlooked.-Downs,<br />
Lewes and Hastings, Sussex; Portland, Dorset; Staple Fitzpaine,<br />
Somerset; near Cheltenham, Gloucestershire; Epping Forest, Essex;<br />
Dolgelly, Merioneth; Colwyn Bay, Denbigh; Kentmere, Levens Park<br />
and Cunswick Scar, W Qstmorland; Barrowmouth, Cumberland; Ben<br />
Lawers, Perthshire; Achosragan Hill, Appin, .Argyll; near Cork.<br />
61. L. immersa Ach. Meth. 34 (1803).-Thallus effuse, very<br />
thin, leprose, white or greyish-white, mostly immersed (K-,<br />
CaCI -). Apothecia medium-sized, immersed in depressions or<br />
pits (foveolate), plane, blackish, cresio-pruinose or naked, within<br />
greyish in the middle, the margin thin, evanescent; paraphyses<br />
concrete; epithecium and hypothecium more or less brownish;<br />
spores ellipsoid or sub ellipsoid, 12-18 (.L long, 7-10 (.L thick;<br />
hymenial gelatine bluish then wine-red with iodine.-S. F. Gray<br />
Nat. Arr. i. 467; Hook. in Sm. Engl. Fl. v. 179; Tayl. in Mackay<br />
Fl. Hib. ii. 125. L. calcivora Nyl. in Act. Soc. Linn. Bard. ser. 3,<br />
i. 381 (1856); Mudd Man. 203; Cromb. Lich. Brit. 81; Leight.<br />
Lich. Fl. 300; ed. 3, 310. lAchen immersus Web. Spicil. Fl.<br />
Goett. 188 (1778) pro parte; Engl. Bot. t. 193; With. Arr. ed. 3,<br />
iv. 6 pro parte. L. calm'l'orus Ehrh. Crypt. Exs. n. 244 (1793).<br />
Exsicc. Bohl. n. 49 (plate); Leight. n. 94; Cromb. 11. 184.