308 LICHENACEI. [pHYscra 
rare in §. England and S.W. Scotland.—B, M.: a eaten Isle of 
Wight; St. Leonard’s Forest, Sussex; Ilsham Valley, Torquay, and 
Wembury, 8. Devon. Near Creetown, Kirkeudbrightshire. 
Var. 5. subpapillosa Cromb. Journ. Bot. 1882, p. 273.—Thallus 
greyish-white, pruinose, almost entirely subgranulato-unequal or 
subpapillato-granulate. Apothecia nearly moderate, pruinose, with 
turgid margin. 
A very singular and, if constant, well-marked variety, which is so ab- 
normal that at first sight it would scarcely be referred to this species. 
In the single specimen seen the thallus has only one or two short lacinis 
here and there visible at the extreme circumference. There are but two 
apothecia present, in which the margin is also slightly subpapillate. 
Hab. On the trunk of an old tree in a lowland tract—Distr. Seen 
only from E. England.—B. M.: Bury St, Edmunds, Suffolk. 
Subsp. 1. P. venusta Nyl. ew Lamy, Bull. Soc. Bot. t. xxv. (1878) 
p. 883.—Thallus cervine or cervine-greyish, epruinose, somewhat 
narrowly incised. Apothecia moderate, the margin crowned with 
horizontal thalline lacinioli—Cromb. Grevillea, xv. p. 78.—Physcia 
pulverulenta var. venusta Cromb. Lich. Brit. p. 39; Leight. Lich. 
Fl. p. 147 pro parte, ed. 3, p. 186 pro parte. Parmelia venusta 
Ach. Meth. (1808) p. 211, t. 8. f. 5. 
Differs in the colour of the naked thallus, the narrower laciniz, and the 
coronate margins of the apothecia, which entitle it to rank as a subspecies. 
It is to be noted, however, that states occasionally occur evidently 
belonging to this subspecies in which the receptacular margin is nearly or 
almost denudate (form ecoronata Cromb.). The apothecia in the British 
specimens are not numerous, though somewhat crowded. 
Hab. On trunks of old trees in wooded upland situations.— Dist. Local 
and scarce in 8.W. a are S.W. Scotland, the 8, and W. Highlands, 
and in 8.W. Ireland.—B. M.: Ilsham, Torquay, 8. Devon. New Gallo- 
way, Kirkeudbrightshire ; by Loch Tay, Kenmore, Perthshire ; S. of Fort 
William, Inverness-shire. Carrigaloe, co. Cork; Ballynegarde, co. 
Limerick. * 
Subsp. 2. P. pityrea Nyl. e« Lamy, Bull. Soc. Bot. t. xxv. (1878) 
p. 383.—Thallus subeffuse, thinner, appressed and adnate, greyish- 
white or subcervine ; lacinise: somewhat short, sorediate at the mar- 
gins (K~, CaCl_). Apothecia small, pruinose, the margin crenulate 
or sorediato-lacerate ; spores 0,024-28 mm. long, 0:015-18 mm. 
thick.—Cromb. Grevillea, xv. p. 78.—Physcia pulverulenta var. 
pityrea Cromb. Lich. Brit. p. 38; Leight. Lich. Fl. p. 146, ed. 3, 
p. 135. Parmelia pityrea Sm. Eng. Fl. v. p. 201. Lichen pityreus 
Ach, Prodr. (1798) p. 124; Eng. Bot. t. 2064. Borrera pulveru- 
lenta y. grisea (Lam.) Mudd, Man. p.111. Lichenoides glaucum 
orbiculare, segmentis latiusculis, scutellis nigris Dill. Muse. 177, t. 23. 
