308 LICHEXACEI. [PHYSCIA 



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

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

 Wembury, S. Devon. Near Creetown, Kirkcudbrightshire. 



Yar. c. subpapillosa Cromb. Journ. Bot. 1882, p. 273. — Thallus 

 greyish-white, pruiuose, almost entirely subgraiiulato-unequal or 

 subpapillato-granulate. Apothecia nearly moderate, pniinose, with 

 turgid margin. 



A very singular and, if constant, well-mai*ked variety, which is so ab- 

 normal "that at first sight it would scarcely be referred to this species. 

 lu the .single specimen seen the thallus has only one or two short lacinise 

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

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



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

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



Subsp. \. P. venusta Xyl. <?.vLamy, 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. — Physcia 

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

 PL p. 147 pro parte, ed. 8, 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 

 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. 



Hah. 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, Kirkcudbiightshire ; by Loch Tay, Kenmore, Perthshire ; S. of Fort 

 William, luvemess-shire. Carrigaloe, co. Cork ; Ballynegarde, co. 

 Limerick. 



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

 p. 383. — Thallus subeffuse, thinner, apprcssed and adnate, greyish- 

 white or subcervine ; laciuiae 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. Eug. Fl. v. p. 201. Lichen pity reus 

 Ach. Prodr. (1798) p."^124; Eug. Bot. t. 2064. Borrera pulveru- 

 lenta y. grisea (Lam.) Mudd, Man. p. 111. Lichenoides ylaucvm 

 orbicuhre, segmentis latiusculis, scutellis nigris DWl.^use. 177, t. 23. 



