ACAROSPORA | LECANORACE 339 
tips; spores oblong, 3-4 p long, | mw thick; hymenial gelatine 
blue then wine-red with iodine.—Parmelia squamulosa var. 
discreta Ach, Meth. Lich. Suppl. p. 41 (1803). Parmelia discreta 
Fr. Summ. Veg. Scand. p. 106 (1866). Lecanora admissa Ny. 
in Flora |. p. 370 (1867) ; Cromb. Lich. Brit. p. 57 & Monogr. i. 
p. 485; Leight. Lich. Fl. p. 185. LL. discreta Nyl. in Flora lv. 
p. 364 (1872) ; Leight. Lich. Fl. ed. 3, p. 171 ; Cromb. Monogr. 
i. p. 485. 
Ezsice. Johns. n. 151. 
Distinguished by the dark, angularly areolate thallus. <A species 
collected by Harriman at Teesdale, with scattered areolw, belongs to 
A. smaragdula. 
Hab. On exposed siliceous rocks in upland or mountainous 
regions.— Dist. Rare in N. Wales, N. England and the Grampians, 
Scotland.—B. M. Y Fegle Fawr, near Barmouth, Merioneth ; Bywell, 
Northumberland; summit of Ben Lawers, Perthshire; summit of the 
Khoil, near Ballater, Aberdeenshire. 
12. A. Heppii Koerb. Parerg. p. 61 (1859).—Thallus effuse, 
very thin, continuous or partly obsolete, dirty-yellowish (K — 
CaCl—). Apothecia small, the dise dark reddish-brown, the 
margin prominent, entire ; paraphyses coherent, slender, some- 
times branched, septate, scarcely widened upwards, the epithe- 
cium dark-brown ; spores oblong-ellipsoid, 4—4°5 » long, 1-2 p 
thick ; hymenial gelatine blue with iodine.—A. cervina var. 
Heppii Mudd Man. p. 160 (1861). Myriospora Heppii Naeg. 
ex Hepp Flecht. Eur. n. 57 (1853). Lecanora Heppii Nyl. in 
Not. Sillsk. Faun. & Fl. Fenn. Forh. ns. v. p. 182 (1866) ; 
Cromb. Lich. Brit. p. 57 & Monogr. i. p. 487 ; Knowles in Soc. 
Proc. Roy. Dubl. Soc. xiv. p. 131 (1913). L. squamulosa f. 
privigna Leight. Lich. Fl. p. 185 (1871) pro parte; f. Heppii 
op. cit. ed. 3, p. 170 (1879). 
Hasice. Leight. n. 196. 
An inconspicuous plant, with the thallus often scarcely visible. 
The apothecia are numerous, The spores in the specimens examined 
(Hepp exs. n. 57 and others) are smaller than the sizes quoted from 
Th. Fries; they measure about 2°5-3 p long, 1 p» thick. 
Hab. On siliceous and calcareous rocks in maritime and inland 
districts.— Distr. Rare in 8. and N. England, Wales and E. Ireland. 
—B. M. Lyndhurst, New Forest, Hants; South Downs and Hastings, 
Sussex; Bexley Hill, Kent; Great Ayton and Easby, Cleveland, 
Yorkshire ; Llandrindod, Radnorshire. 
53. LECANIA Massal. Alc. Gen. p. 12 (1853) ; Mem, Lich. 
p- 120 (1853); Mudd Man. p. 140 (1861) pro parte. (Pl. 53.) 
Thallus squamulose, imbricate or lobed at the circumference 
and corticate above, or variously crustaceous. Algal cells 
Protococeus. Apothecia reddish-brown or blackish, marginate 
when young, the margin often disappearing ; spores generally 8 
Zz 2 
