BRITISH LICHENS
BRITISH LICHENS
BRITISH LICHENS
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LECIDEA LECIDEACE.iE 47<br />
Somewhat like L. leptostigma, but very distinctive on account of the<br />
large spores and the thick uneven thallus, which becomes pitted after<br />
the disappearance of the apothecia. The apothecia are orlginally<br />
descrIbed as Irregularly grouped in small circles, a character not well<br />
marked in our specimen.<br />
Hab. On limestone.-B. lrf. Bathampton Downs, Wiltshire.<br />
64. L. Bauschiana A. L. Sm.-Thallus thin, filmy or furfuraceous,<br />
pale-tawny. Apothecia minute, convex, yellowishbrown<br />
to dark-brown or black; hypothecium brownish-yellow or<br />
colourless in thin section; paraphyses conglutinate, the epithecium<br />
colourless or brownish; spores ellipsoid, minute, 8 1.1. long,<br />
4 1.1. thick or smaller.-L. dilutiuscula Nyl. in Flora lix. 308 (1876);<br />
Leight. Lich. FI. ed. 3, 256 (187n). Biatora' Bauschiana Koerb.<br />
Parerg. Lich. 157 (186), fide N yl. Lich. Env. Paris, 93 (1896).<br />
In the preVIOUS edItion this species had been associated with L.<br />
sylvicola var. indigula. Some of the specimens determined as L.<br />
dilutiuscula are now included here. The thallus and apothecia closely<br />
resemble those of L. sylvicola.<br />
Hab. On schistose rocks.-Distr. Rare in S. England.-B. ltl. Near<br />
Ditcham Cove and ncar Buckfastleigh, S. Devon.<br />
65. L. rusticula Nyl. in Flora xlix. 371 (1866).-Thallus<br />
effuse, granulate, the granules depressed-convex, sub crenate ,<br />
smooth, glaucous-white (K + yellowish, CaCI + yellow). Apothe<br />
cia minute, somewhat plane, margined, black, the margin<br />
entire, at length obliterated; paraphyses concrete; epithecium<br />
vaguely brownish; hypothecium brown; spores ellipsoid, 10-15 1.1.<br />
long, 5-8 1.1. thick; hymenial gelatine deep-blue then sordidyellowish<br />
with iodine.-Leight. in Ann. Mag. Nat. Rist. xix. 407<br />
(1867); Cromb. Lich. Brit. 84; Leight. Lich. Fl. 271; ed. 3, 272.<br />
Considered by Nylander to be related to L. expansa, but the<br />
character of the apothecia indicates its pOSItion in Sect. Biatora. These<br />
are at first concave with an obtuse margin. In the small specimen<br />
seen they are few and scattered. Spermogones have not been detected.<br />
Hab. On quartzose rocks in mountainous districts.-Distr. FQund<br />
only very sparingly in N. Wales and N.W. Ireland (Salrock Road,<br />
Connemara, Galway fide Leight. Lich. Fl. ed. 3 l. c.).-B. jJl. Giant's<br />
Pebbles, Cader Idris, Merioneth.<br />
66. L. rusticella Nyl. in Flora lxi. 245 (1878).-Thallus effuse,<br />
thin, subleprose, whitish-ochraceous (Ie + reddish, CaCI -).<br />
Apothecia minute, convex, immarginate, black, opaque, dark,<br />
within; paraphyses concrete; epithecium and hypothecium<br />
brown or brownish; spores sub oblong, 6-9 1.1. long, 2'5-3'5 1.1. thick;<br />
hymenial gelatine bluish then tawny-wine-red with iodine.<br />
Cromb. in Grevillea vii. 97; Leight. Lich. Fl. ed. 3, 252.<br />
Exsicc. Johns. n. 504.<br />
Comparable with L. rusticula, but distinct in the character of the<br />
thallus and in the smaller spores. The colour of the thallus, which<br />
:Nylander, l. c., says may be normally greyish, is evidently dUll to<br />
suffusion by peroxide of iron. The apothecia are rather scattered.