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