BRITISH LICHENS

VERRUCARIA VERRUCARIACElE 313
determinate. Perithecia immersed in the thallus, becoming
emergent and prominent; perithecial wall black or brownishblack;
spores ellipsoid, narrower at the ends, 18-24 !J. long,
10-12 !J. thick-Yo margacea var. cataleptoides Nyl. in Act. Soc.
Linn. Bord. ser 3, i. 428 (1856).
Hab. On rocks, granitic or schistose.
Form ferruginosa Lamy Catal. Lich. 160 (1880).-Thallus
bright ochraceous-red, cracked-areolate; spores 18 !J. long,
8 !J. thick-Shackleton & Hebden in Naturalist, 1892, 17. V.
margacea var. cataleptoides f. ferrugmosa Nyl. in Maine et Loire
Mem. Soc. Acad. iv. 26 (1868).
The specimen from Yorkshire had spores 19-23 t.t long, 9-11 t.t thick.
Hab. On lim('stone crags.-B. lrI. Malham, Yorkshire.
29. v. coerulea DC. Fl. Franc. ii. 318 (1805); Schmr. Enum.
216 (1850).-Thallus bluish-lead-coloured, greyish or greyishbrown,
rather thick, determinate, faintly cracked-areolate.
Perithecia black, small, semi-immersed, scarcely prominent,
slightly depressed at the ostiole; perithecial wall thick, entire;
spores ellipsoid or oblong, 14-19 !J. long, 4-7 t.t thick; hymenial
gelatine wine-red with iodine.-V. plumbea Ach. Lich. Univ.
285 (1810); Hook in Sm. Eng!. FI. v. 153 (1833); Tay!. in
Mackay Fl. Hib. ii. 91; Leight. Angioc. Lich. 45, t. 19, fig. 5 &
Lich. Fl. 421; ed. 3, 452; Deakin in Ann. Mag. Nat. Hist. ser.
2, xiii. 36, t. 3, fig. 8 (1854); Mudd Man. 288 (incl. var. cineracea);
Cromb. Lich. Brit. 111. Lichen coeruleus Ramond ex DC. 1. c.
L. plurnbosus Sm. Engl. Bot. t. 2540 (1814). Lithocia p1urnbea
S. F. Gray Nat. Arr. i. 497 (1821).
EX8tCC. Mudd n. 275 (as V. p1umbea var. cineracea).
The thickish, sometimes orbicular thallus is limited and occasionally
intersected by the dark-coloured hypothallus.
Hab. On calcareous rocks.-Distr. Uncommon in 'V. and N.
England, W. Scotland and in S. and w. Ireland.-B. M. Hazleton,
Gloucestershire; Buxton, Derbyshire; near Rievaulx and Newton
Wood, Cleveland, Yorkshire; Whitbarrow and Arnside, Westmorland;
Craig Tulloch, Perthshire; I. of Lismore, Argyll; Kenmare, Kerry;
Dromoland, Clare.
30. v. murina Leight. Angioc. Lich. 44, t. 19, fig. 3 (1851).­
Thallus mouse-grey or brownish, thin, effuse, continuous and
slightly pulverulent or occurring in spots and determinate.
Perithecia small, numerous, semi-immersed, prominent; perithecial
wall thickish, black, entire; spores ellipsoid, 18-24 !J. long,
6-12 !J. thIck-Mudd Man. 291; Cromb. Lich. Brit. 115; Leight.
Lich. Fl. 425; ed. 3, 455. V. myrwcarpa Hepp Flecht. Eur.
n. 430 (1857); Cromb. in Journ. Bot. xiv. 362 (1876); Leight.
Lich. Fl. ed. 3, 456.
Exsicc. Larb. Lich. Hb. n. 160 (as V. myriocarpa).