308 LICHENACEI. [i>HrSCIA 



rare in S. England and S.W. Scotland. B. M. : Appuldurcombe, Isle of 

 Wight; St. Leonard's Forest, Sussex; Ilsham Valley, Torquay, and 

 Wembury, S. Devon. Near Creetown, Kirkcudbriglitshire. 



Var. S. 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 laciniae 

 here and there visible at the extreme circumference. There are but two 

 apothecia present, in which the margin is also slightly subpapillate. 



Hob. On the trunk of an old tree in a lowland tract Distr. Seen 

 only from E. England. B. M. : Bury St. Edmunds, Suffolk. 



). 1. P. venusta NyL a?Lamy, Bull. Soc. Bot. t. xxv, (1878) 

 p. 383. Thallus cervine or cervine-greyish, epruinose, somewhat 

 narrowly incised. Apothecia moderate, the margin crowned with 

 horizontal thalline lacinioli. Cromb. Grevillea, xv. p. 78. PTiyscia 

 pulverulenta var. venusta Cromb. Lich. Brit. p. 39 : Leight. Lich. 

 Fl. p. 147 pro parte, ed. 3, p. 136 pro parte. Parmelia venusta 

 Ach. Meth. (1803) p. 211, t. 8. f. 5. 



Differs in the colour of the naked thallus, the narrower lacinise, 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 

 b3longirig 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. 



Hob. On trunks of old trees in wooded upland situations. Distr. Local 

 and scarce in S.W. England, S.W. Scotland, the S. and W. Highlands, 

 and in S.W. Ireland. B. M. : Ilsham, Torquay, S. Devon. New Gallo- 

 way, Kirkcudbrightshire ; by Loch Tay, Keumore, Perthshire ; S. of Fort 

 William, Inverness-shire. Carrigaloe, co. Cork ; Ballyuegarde, co. 

 Limerick. 



Subsp. 2. P. pityrea Nyl. ex Lamy, Bull. Soc. Bot. t. xxv. (1878) 

 p. 383. Thallus subeffuse, thinner, appressed and adnate, greyish- 

 white or subcervine ; lacinire 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. PTiyscia 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 pity reus 

 Ach. Prodr. (1798) p. 124 ; Eug. Bot. t. 2064. Son-era pulveru- 

 lenta y. yrisea (Lam.) Mudd, Man. p. 111. Lichenoides glaucum 

 orbiculare, seymentis latiusculis, scutellis niyris Dill. Muse. 177, t. 23. 



