BRITISH LICHENS
BRITISH LICHENS
BRITISH LICHENS
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LECIDEA LECIDEACEiE 105<br />
paraphyses indistinct, the epithecium greenish-black, the colour<br />
penetrating into the narrow hymenium; spores ellIpsoid, small,<br />
6-10 (.I. long, 3·5 (.I. thick; hymenial gelatine bluish then tawnywine-coloured<br />
with iodine.-Cromb. in Grevillea v. 26; Leight.<br />
Lich. Fl. ed. 3, 268.<br />
Considered by Nylander to be near to L. moestula, but the epithecial<br />
colOUrIng indicates the sect. Euleculea.<br />
The specim.ens from Ireland are overrun by a blue.green alga<br />
(Stigonema sp.). In the Cornwall specimen (from Hb. Martmdale)<br />
determined by E. 'V. Holmes, there is no alga present and the scattered<br />
granules have flattened and developed into small scattered whitish-grey<br />
areolffi.<br />
Hab. On dry arenaceous rocks in maritime districts.-B. M.<br />
Grayley, Cornwall; road to Westport, Kylemore, Connemara, Galway.<br />
190. L. alienata Nyl. in Flora lxii. 362 (1879).-Thallus effuse,<br />
somewhat granular or leprose, unequal, thin, scattered, greyishyellow<br />
JKf + yellowish, K(CaCI) + pale-tawny-reddish). Apothe<br />
cia minute, prominent, thinly margined, glomerulose-connate,<br />
black; hypothecium blackish; paraphyses moderate, palebluish<br />
at the apices; spores ellipsoid, 12-15 (.I. long, 7-8 (.I. thick;<br />
hymenial gelatine scarcely tinged, but the asci bluish then tawny<br />
with iodine.-Lithographa Larbalestierii Leight. Lich. Fl. ed. 3,<br />
394 (1879).<br />
Exsicc. Larb. Lich. Hb. n. 153.<br />
From its graphideine aspect referred by Leighton to Lithographa.<br />
The fructification constitutes irregular, scattered glomerules, each of<br />
which is composed of 12 or more apothecia. The gomdla are cithcr<br />
simple or subglomerulose. Spermogones not seon.<br />
Hab. On moist schistose rooks.-B. M. Kylemorc Lake, Galway.<br />
191. L. advertens Nyl. in :Flora xlIx. 419 (1866).-Thallus<br />
indeterminate, thin, subfurfuraceous, byssoid, olive-black (K-,<br />
CaCI -). Apothecia minute, at length somewhat convex and<br />
immarginate, black; paraphyses concrete; hypothecium black<br />
or brownish-black; epithecium sordid-bluish; spores ellipsoid,<br />
11-14 (.I. long, 7-9 (.I. thick; hymenial gelatine bluish with iodine.<br />
-Leight. in Ann. Mag. Nat. Rist. SE'r. 3, xix. 408 (1867) & Lich.<br />
Fl. 255; ed. 3, 251; Cromb. Lich. Brit. 86.<br />
Associated with blue-green algrn, and has the aspect externally of<br />
Spilonema revertens.<br />
Hab. On calcareous rocks in maritime and subalpine tracts.lJistr.<br />
Found only in Wales and N.W. Ireland.-B.1J1. GIl tar Point,<br />
Tenby, Pembrokeshire.<br />
192. L. segregans Nyl. in. Flora xlix. 372 (1866).-ThaIIus<br />
indeterminate, verrucose-granular, whitish or greyish-white, the<br />
granules more or less segregate, or here and there confluent;<br />
hypothallus blackish, usually little visible. Apothecia small,