BRITISH LICHENS

OPEGRAPIIA QRAPHIDACElE 259
elongate or angular; disc bluish-pruinosc; margins thin, prominent,
persistent; hypothecium thick, black; paraphyses thickish,
shortly branched above and somewhat conglutinate; spores
colourless, oblong-fusiform, 3-septate, 15-17 fL long, 3-4 (J.
thick.-Leight. Lich. Fl. 380; ed. 3, 403 & in Grevillea ii. 171,
t. 26, f. 2 (1874).
Apt to be confused with Lecanactis Dillemana, but with a much
thicker thallus, and more graphideinc apothccla. The reaction with
CaCI on our speCimens is very faint.
Hab. On rocks.-Distr. Rare in the Channel Islands, S. England and
W. Scotland.-B. M. Near Rozel, Jersey; Walls of Old Nunnery,
Alderney; Lynton and Lynmouth, Devon; I. of Portland, Dorset;
l\flllport, I. of Cumbrae.
10. O. nothiza Nyl. in Flora lxxx. 13 (1880).-Thallus greyish,
thin and firm, cracked into small areolm on a blackish almost
obsolete hypothallus. Apothecia black, oblong, roundish or
angular; disc plane, usually bluish-pruinose; margins thin,
prominent, disappearing; hypothecium thick, brownish-black;
paraphyses thickish, shortly branched above and somewhat
conglutinate; spores oblong, 3-septatr, colourless, 15-17 (J. long,
3-4 (J. thick.-Cromb. in Grevillea viii. 113 & in Journ. Bot. xx.
276 (1882). O. varia f. notha (saxicolous). Leight. J_Jich. Fl.
381; ed. 3, 404 (see Larb. exswc. n. 317).
Exsicc. Larb. Lich. Rb. n. 317 & Lich. Cmsar. n. 91.
Perhaps only a growth form of the prcceding, which it strongly
resembles, dIffering chiefly in the thin grey areolato thallus and the
less distinctly pruinose apothecia.
Hab. On rocks.-Distr. Rare in the Channel Islands.-B. M.
La Coupe, East Coast, Jersey; Moulm Huet Bay, Sark.
11. O. calcarea Turn. in Sm. Engl. Bot. t. 1790 (1807); Ach.
Lich. Univ. 250 (1810).-Thallus white or yellowish, tartareous,
sometimes very thin and pulverulent. Apothecia lmear-elongate,
black, simple, curved, flexuose and wavy, usually conglomerate
in small crowded swards, sometimes scattered, shining; disc
slit-like, rather open; paraphyses crowded, slender, subdiscrete;
asci broadly clavate with a thick wall at the tip; spores somewhat
clavate, colourless, sometimes becoming brownish, 3-septate,
14-19 fL long, 4-6 (J. thick.-O. saxatilis Fr. Lich. Eur. 366 (1831),
pro parte (non DC.); Rook. in Sm. Engl. Fl. v. 145 pro parte;
Tayl. in Mackay Fl. Rib. ii. 106. O. Chevallieri Leight. in Ann.
Mag. Nat. Rist. ser. 2, Xlii. 90, t. 5, f. 4 (1854) (excl. syn.); Mudd
Man. 228 (excl. syn.). O. atra var. calcarea Stiz. in Nov. Act.
Acad. Leop.-Carol. xxxii. 4, 18, t. 1, f. 5, a-d (1865); Cromb. Lich.
Brit. 98; var. Chevallieri Stiz. l. c. 20, t. 1, f. 5, t-z; Cromb. l. c.
O. saxicola var. Chevallieri Leight. Lich. Fl. 379; ed. 3, 402.
Hysterina calcarea S. F. Gray Nat. Arr. i. 505 (1821).