LECANORA., ] LECANO-LECIDEEL, 487 
192. L. Heppii Nyl. Not. Sillsk. pro F. et Fl. Fenn. Forh. n.s. v. 
(1866) p. 182.—Thallus effuse, very thin, continuous, greyish-white 
or sordid-ochraceous (K—, CaCl—). Apothecia minute, concave, 
brown, the margin entire, at length inflexed ; epithecium gyalectoid- 
impressed ; paraphyses slender, not discrete; spores oblongo-ellipsoid, 
0,0040-45 mm. long, 0,0015-20 mm. thick; hymenial gelatine 
bluish, then wine- or sordid-wine-red with iodine.—Cromb. Lich. 
Brit. p. 57.—Lecanora squamulosa forma Heppii Leight. Lich. Fl. 
ed. 8, p. 170. Acarospora cervina ¢. Heppit Mudd, Man. p. 160. 
Myriospora Heppii Naeg. in Hepp, Exs. (1853) n. 37. Lecanora 
squamulosa forma privigna Leight. Lich. Fl. ed. 1, p. 185 pro parte. 
—Brit. Hxs.: Leight. n. 196. 
A rather inconspicuous plant very apt to be overlooked. Itis apparently 
a distinct species, though its claims to be so have at times been questioned. 
The thallus is often scarcely visible and, as observed by Th. M. Fries’ 
(Lich. Scand. p. 218), is rarely minutely verruculose. The form of the 
minute, usually numerous apothecia give it much the aspect of some 
young G'yalecta, 
Hab. On arenaceous and calcareous rocks and flints in maritime and 
upland situations,— Distr. Only a few localities in England and 8. Wales. 
—B. M.: South Downs, Hastings, and Bexley Hill, Sussex ; Lyndhurst, 
New Forest, Hants; Great Ayton, Cleveland, Yorkshire. Llandrindod, 
Radnorshire, 
Q. Apothecia normally lecideine ; thecss myriospored ; spores simple, 
minute, colourless. Spermogones with simple sterigmata, at- 
tenuate at the apices, and ellipsoid, very minute spermatia. 
(Sarcogyne Mass, Geneac. (1854) p. 10.) 
193. L. pruinosa Nyl. in 
Cromb. Lich. Brit. (1870) p. 57. = 
—Thallus very thin, leprose, a 
greyish-white (K—, CaCl—), B bea 
usually obsolete. Apothecia . 0 ona 
moderate, appressed, plane, 0 as 
reddish-black when moist, biack X350 c 
and more or less cesio-pruinose i, 
when dry, whitish within, the (ie 
margin thin, entire, sometimes aie iat 
undulate; hypothecium thin, ay: 
subincolorous; paraphyses slen- ree 
der, not discrete, brown at the ‘ 
apices; spores oblongo-cylin- Fig. 68. 
drical, 0,005-6 mm. long, Lecanora pruinosa Nyl—A. A theca 
scarcely 0,0003 mm. thick; 
hymenial gelatine bluish, then 
wine-red with iodine.—Cromb. 
Grevillea, xix. p. 58.—Lecanora 
with paraphysis (separated by K), 
<x 350. 3B. Three spores, x 350. 
C. Sterigmata and spermatia, x 500. 
laucocarpa forma pruinosa Leight. Lich. Fl. p. 183, ed. 3, p. 168. 
Lactdet pruinosa Sm. Eng. Fl. v. p. 179; Tayl. in Mack. Fl. Hib. 
