BRITISH LICHENS

244 GRAPHIDINEJE LTTHOGRAPHA
Capel Curig, Cwm Clyd, Nant Frangcon, Snowdon, Carnarvonshire;
near StaveJey, Kendal, W'estmorJand; lIolwick Scar, Teesdale,
Durham; Ben Lawers, Perthshire; summit of Morrone, Braemar,
Aberdeenshire; Hills of Applecross, Ross:shire.
2. L. flexella A. Zahlbr. in Engler & Prantl. Nat. Pflanzen£.
i. 1*, 93 (1903).-Thallus effuse, thin, whitish, or nearly
obsolete (K -, CaCl-). Apothecia superficial, minute, black,
oblong or angular, the disc narrow and slit-like or irregularly
dilated; hypothecium brown or blackish-brown; paraphyses not
well discrete, dark at the apices; spores 8 in the ascus, ovoid or
ellipsoid, minute, 4-6 !L long, 2-3 !L thick; hymenial gelatine
bluish then sordid-wine-red with iodine.-Limboria flexella Ach.
in Vet. Acad. Handl. 1815, 258. Xylographa flexella Fr. Summa
Veg. Scand. 372 (1849); Nyl. in Mem. Soc. Sci. Nat. Cherb. v.
128 (1857); Cromb. in Journ. Bot. xiv. 362 (1876); Leight.
Lich. Fl. ed. 3, 392.
An aberrant species, allied to Xylographa, but with a dark carbonaceous
hypothecium.
Hab. On stumps of felled trees.-B. M. Oakley Park, near Cirencester,
Gloucestershire.
3. L. Andrewii Stirton in Scott. Nat. 1878, 300.-Thallus
indeterminate, thickish, subareolate, white or greyish-white
(K -, CaCl-). Apothecia small, sessile or innate-sessile,
roundish or oblong, simple or rarely divided, the margins prominent,
black, the epithecium becoming applanate; hypothecium
brownish; paraphyses slender, discrete; spores ellipsoid or subglobose
8-9 !L long, 5-6 !L thick, with a distinct epispore; hymenial
gelatine not tinged, the asci tawny-yellow, with iodme.-Leight.
Lich. Fl. ed. 3, 394.
The apothecia in the single specimen scen are crowded; Stirton
states that they are albo·velate in a young state.
Hab. On a granitic rock in an upland hilly district.-B. M. Cairn
Edward, New Galloway, Kircudbrightshlfe (the only locality).
4. L. dendrographa Nyl. in Flora xlvii. 488 (1864).-Thallus
effuse, very thin, greyish (K -, CaCl-), subevanescent. Apothecia
erumpent, linear, oblong or elliptical, simple or slightly dividedfurcate,
black, concolorous withm; epithecium narrow, becoming
applanate; paraphyses slender, irregular, not well discrete;
h.ypothecium brownish-black; ascus many-spored; spores
ellipsoid, 5-8 p. long, 3-4 !L thick; hymenial gelatine wine-red
with iodine.-Cromb. Lich. Brit. 95; Leight. Lich. Fl. 361; ed.
3,393.
In the British specimens the thallus is usually but little visible,
and becomes at length quite obsolete. The arothecia are numerous
and crowded, though at times somewhat scattered. 'Vhen these are