I'AKMKI.IA,] PARMELIEl. 2(31 



;31. P. vittata Xyl. Flora, 1875, p. 100.— Thallus somewhat ex- 

 panded, liiicari-laciniate, loosely aduate, smooth, greyish-glaucous ; 

 beneath naked, black ; laciniae elongate, divaricately divided, some- 

 what plane, dark-brown or blackish at the margins (K^-^^^'°^,CaCl~ ). 

 Apothocia pedicellate, large, badio-reddish, the margin thin, entire 

 or inflexed ; spores 0,00-1-6 mm. long, 0,00:35-45 mm. thick. — Cromb. 

 (xrevillca, xv. p. 70. — Pannella phi/sodes p. vittata Ach. Meth. 

 (1803) p. 251: Mudd, Man. p. 1)0 pro parte ; Cromb. Lich. Brit, 

 p. 30 pro parte ; Leight. Lich. Fl. p. 120 pro parte, ed. 3, p. 117 

 pro parte. 



Formerly regarded by authors as a variety of P. p/n/socles, but now 

 separated by Nylander ou account of the smaller spores and shorter sper- 

 matia. The tb alius does not apparently become sorediiferous at the 

 apices of the laciniae, and in our specimens is of a glaucous-brown colour. 

 Neither apothecia nor spermogoues occur in Britain. These latter organs 

 have the spermatia 0,0045 mm. long, 0,0006 mm. thick. 



Hab. On the ground in alpine places. — Distr. Found only on one of 

 the higher X. Grampians, Scotland. — B. M. : Cairntoul, Braemar, Aber- 

 deenshire. 



32. P. encausta Ach. ileth. (1803) p. 202.— Thallus suborbicular, 

 appressed, corrugate, narrowly laciniate, unequal, greyish-white or 

 greyish-glaucous ; beneath black, naked ; lacinite crowded, multifid, 

 complicate, convex or somewhat rounded, only slightly inflated at 



the apices (K J^yellow, CaCl~ ). Apothecia aduate, moderate or small, 



badio-reddish, the margin crenulate or subentire ; spores 0,007-10 

 mm. long, 0,005-7 mm. thick. — Gray, Xat. Arr. i. p. 441 ; Hook. 

 Fl. Scot. ii. p. 54; 8m. Eng. Fl. v. p. 203; Mudd, Man. p. 97 ; 

 Cromb. Lich. Brit. p. 36. — Parmelia jili;isodes var. encausta Leight. 

 Lich. Fl. p. 127, ed. 3, p. 117. Lichen eacaustus Sm. Trans. 

 Linn. Soc. i, (1791) p. 83. 



Sometimes regarded as an alpine var. of P. phj/sodes ; but In the 

 absence of any -svell-marked intermediate states it may be considered 

 distinct. In regions where the plant is common, the thallus varies con- 

 siderably in colour and in the character of the laeinite, but the verv few 

 British specimens are sufficiently typical. The apothecia are more or less 

 scattered, at tirst concave, then pLine, and in old plants flexuose. The 

 .spermogoues are frequent, minute, black, with spermatia 0,007 mm. long, 

 about 0,001 mm. thick. 



Hab. On granitic boulders in alpine places. — Distr. Found on one of 

 the higher X. Grampians, Scotland. — B. M. : Cairntoul, Braemar, Aber- 

 deenshire. 



33. P. pertusa Schoer. Spic. (1840) p. 457. — Thallus orbicular, 

 plauo-appressed, glabrous, sinuato-laciniate, glaucous- white : be- 

 neath black, rugose, naked ; laeinia3 multifid, convex, minutely 



perforate, dilated and crenato-incised at the apices (K^Tyellow, 



CaCl~). Apothecia central, small, reddish-brown, the margin 



entire, inflexed ; spores 2-4nae, 0,0045-60 mm. long, 0,022-28 

 mm. thick. — Cromb. Lich. Brit. p. 36 ; Leight. Lich. Fl. p. 129, 

 ed. 3, p. 120. — Lichen pertusus Schrank, Fl. Bavar. ii. (1789) 



