266 CYCLOCARPINEZ [LECANORA 
I have been unable to find spores in our specimens. The darker 
colour may be due to more direct exposure. Spermatia are recorded 
as 3°5-4°5 pw long, *5 p thick. 
Hab. On fiints in a maritime district.—B. M. Beachy Head, 
Sussex (the only locality). 
9. L. melanaspis Ach. Lich. Univ. p. 427 (1810).—Thallus 
suborbicular, adnate, areolate-verrucose in the centre, the lobes 
of the circumference branched, convex, cinerous-grey and 
greyish-pruinose (K —, CaCl —). Apothecia rather small, plane, 
dark-coloured, the thalline margin thickish, entire; spores 
ellipsoid, 10-14 » long, 6-10 p» thick ; hymenial gelatine bluish 
then wine-red with iodine.—Leight. Lich. Fl. ed. 3, p. 201; 
Cromb. Monogr. i. p. 403. L. alphoplaca var. melanaspis Stirt. 
Scott. Nat. iv. p. 28 (1877). Parmelia melanaspis Ach. Meth. 
Lich. p. 196 (1803). Specimen not seen. 
A rare lichen; it differs from L. alphoplaca, a Continental plant, 
in the absence of any reaction with potash. 
Hab. On rocks in a mountainous region. Recorded only from 
Ben Brecht, Argyll. 
10. L. exomila Stirton in Scott. Nat. v. p. 217 (1880).— 
Thallus dull-cinereous or also blackish, squamulose-rugulose (if 
proper?). Apothecia appressed dark-brown or brownish-black, 
plane, up to 1 mm. across ; the margin prominent, crenate or in a 
young state somewhat wrinkled, cerulescent or pale cerulescent ; 
hypothecium colourless; paraphyses slender, not well discrete, 
conglutinate at the brown apices; spores 8 in the ascus, colour- 
less, ellipsoid, simple, often binucleate, 9-11 w long, 6°5-8 pw 
thick ; hymenial gelatine blue then tawny with iodine. Specimen 
not seen. 
Stirton is not sure if the thallus belongs to this ‘curious and 
singular Lecanora,” as it grows associated with Bilimbia aromatica, 
which has “‘ a thallus of a corresponding character. In every instance 
the margin is truly cerulescent.”’ 
Hab. On rocks. Collected by Stirton at Glas Miel, Perthshire. 
§ ii. Eutecanora Th. Fr. Lich. Arct. p. 99 (1860), pro parte 
{as subgenus); Cromb. Monogr. i. p. 371, pro parte (as 
subgenus). 
Thallus variously crustaceous. Apothecia superficial ; spores 
moderate in size or rather small. 
For convenience of reference, this large section has been divided 
into a series of groups marked either by thalline or apothecial 
characters. 
A. Subfusca group. — Thallus cinereous-grey or whitish 
(K + yellowish or yellow). Apothecia moderate in size, the 
dise reddish-brown, rarely pale brick-red, or brownish-black. 
