PARMELIA.] PAUMEMEI. 253 



convex, crenato-incised and but slightly dilated at the apices (K~ 

 CaCl~). Apothecia small or moderate, scattered, subconcolorous, 

 the margin entire or subentiro ; spores 0,009-12 mm. long, 0,005- 

 ram. thick. Cromb. Grevillea, x. p. 25. Parmelia olivacea vars. 

 prolixa et dendritica (Pers.) Leight. Lich. Fl. p. 112, ed 3, p. 115. 

 Parmelia olivacea y. prolixa Ach. Meth. (1803) p. 214. Brit. Exs. : 

 Leight. n. 365. 



Generally regarded as a variety of P. olivacea, but separated by the 

 form of the lacinise and by the smaller spores. The thallus is usually 

 smooth, but sometimes rugulose, as is also the margin of the apothecia. 

 The apothecia are rare in Britain, but the spermogones are not unfrequent. 

 They are at length somewhat prominent, with spermatia scarcely 0,007 

 nun*, long, and about 0,001 nun. thick. 



Hub. On rocks in maritime and upland districts. Distr. Local and 

 scarce in W. England and Wales ; here and there in Scotland and in 

 N.W. Ireland. B. M. : Malvern Hills, Worcestershire ; Caer Caradoc, 

 Shropshire ; Llandegley Rocks, Radnorshire ; Moel-y-Golfa, Montgomery- 

 shire; Douglas Head, Isle of Man. New Galloway, Kirkcudbright- 

 shire; Island of Lismore, Argyleshire ; Portlethen, Kincardineshire; Craig 

 Guie, Braemar, Aberdeenshire. Conuemara, co. Galway. 



Subsp. 1. P. sorediata Cromb. Journ. Bot. 1882, p. 273. Thallus 

 smaller, adnate, sprinkled towards the centre with whitish or 

 brownish-white, verrucoso-promineiit soredia ; laciniaB somewhat 

 plane (K~, CaCl~). Apothecia small; spores 0,010-12 mm. long, 

 0,005-6 mm. thick. Parmelia styyia b. sorediata Ach. Lich. Univ. 

 (1810) p. 471. 



Distinguished by the pulviuate soredia with which the thallus is more 

 or less sprinkled towards the centre or occasionally almost throughout. 

 It is of small size (scarcely more than 1 in.), frequently opaque, with the 

 lacinia? contiguous. The apothecia, which are small and scattered, are 

 very rare in Britain as in other countries. 



Hah. On rocks in upland mountainous districts. Diatr. Very local and 

 rare in W. England and among the Central and N. Grampians, Scotland. 

 B. M. : North Hill, Malvern, Worcestershire. Craig Tulloch, Blair 

 A thole, Perthshire ; Craig Guie, Braemar, Aberdeenshire. 



Subsp. 2. P. Delisei Nyl. Flora, 1873, p. 67. Thallus larger, pale- 

 olive, the laciniae broader at the circumference (K(CaCl)~ f pg^jj^). 

 Apothecia and spores as in P. prolixa. Cromb. Journ. Bot. ] 873, 

 p. 133 ; Grevillea, x. p. 25. Parmelia Delisei Leight. Lich. Fl. ed. 3, 

 p. 129. Parmelia olivacea var. Delisei Dub. Bot. Gall. (1829) 

 p. 602. Parmelia olivacea vaf. aquiloides Linds., Mudd, Man. p. 99. 

 Lichen olivaceus pro parte and Parmelia olivacea pro parte of the 

 older and some more recent British authors. Brit. Exs. : Leight. 

 n. 291 pro parte; Larb. Lich. Hb. n. 328; Bohl. n. 109 pro parte. 



The characters of the thallus and the chemical reaction make this a 

 distinct subspecies. In old plants the apothecia become large, crowded, 

 and somewhat llexuose. 



