BRITISH LICHENS

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