BRITISH LICHENS

68 CYCLOCAHPINElE LECIDEA
112. L. mesotropoides NyI. in Flora Iv. 359 (1872).-Thallus
subdeterminate, moderate, verrucose-areolate, grcyish, the areolw
convex (K + yellowish, CaCl -, medulla 1-). Apothecla
small, prominent, blackish, at first plane and thmly margined,
then convex and immarginate; paraphyses slender, more or less
coherent; hypotheeium colourless; spores ellipsoid, 9-11 fI. long,
6-7 fI. thick; hymenial gelatine bluish with iodine.-Cromb. in
Grevillea i. 69; Leight. Lich. FL ed. 3, 282.
Distinguished from L. mesotropa by the thalline reactions, the
thinner apothecia and the shorter spores. The two BrItish specimens
are well fertile. The spermogones, here and there vislble, have the
spermatia 7-10 (.I. long, scarcely 1 (.I. thICk.
Hab. On calcareous and schistose stones of a wall in an upland
situation.-B. IH. Craig Tulloch, Blair Athole, Perthshrre (the only
locality).
113. L. mesotropiza Nyl. in Flora lvi. 20 (1873).-Thallus
indeterminate, moderate, verrucose-rugulose, whitish (K + deep
yellow, CaCI -). Apothecia small or sub moderate, more or leSB
crowded, adnate, black, at first plane and thinly margined, at
length convex, immarginate, sometimes slightly pruinose, bluishgrey
within; paraphyses not very discrete; epithecium darkgreeniRh-blue;
hypothecium colourless; spores ellipsoid, 11-12 (.I.
long, 7 (.I. thick; hymenial gelatine bluish, the asci violet, with
iodine.-Cromb. in Grevillea i. 142; Leight. Lich. Fl. ed. 3, 275.
Externally very similar to the preceding, from which it differs
chiefly in the whitish verrucose thallus and the bluish epithecium.
Hab. On schistose stones of a wall in an upland district.-B. 111.
Hill of Ardo, near Aberdeen (the only locality).
114. L. aggregatula Nyl. in Flora lxvi. 101 (1883).-Thallus
thickish, indetermmate, minutely granulate, the granules aggregate,
grouped in areolw, whitish or greyish-white (K -, CaCI -).
Apothecia small, adnate, plane, subrugulose, at times more or less
congregate, blackish or brownish-black; hypothecium colourless;
paraphyses slender, somewhat clavate and brown at the apices;
spores oblong, 11-15 (.I. long; 5--6 (.I. thick; hymenial gelatine bluish,
then tawny wine-coloured with iodine.-Cromb. in Grevillea
xii. 90.
Exsicc. Larb. Lich. Rb. n. 338 (as LecanoJ"a aggl'egatula).
Considered by Nylander as allied to L. leucophwa. The thallus is
overrun by a blue-green alga. The spermogones have the spermatia
arcuate, 14-18 t+ long, ·5 (.I. thick.
Hab. On rocks.-B. Ill. Charnwood Forest, Leicestershire.
115. L. subkochiana Cromb. in Journ. Bot. ix. 179 (1871).­
Thallus crustaceous, smooth, whitish or greyish, determinate,
cracked-areolate, the areolw plane, contiguous (K + yellowish,
then red, CaCI -). Apothecia black, numerous, innate or sessile