CKTRAKIEI. 225 



Our few authentic specimens are typical, though smaller than in 

 countries where it is more plentiful. The apothecia do not occur in 

 these, and the spennogones are rarely seen. They are minute, marginal, 

 with spermatia 0,007 mm. long, 0,001 mm. thick. 



Hob. On the trunks of aged pines in mountainous woods. Distr. Ex- 

 tremely local and rare in the N. Grampians, Scotland ; very doubtfully in 

 N. England. B. M. : ? Near High Force Inn, Teesdale, Durham (frt.). 

 Clova, Forfarshire ; Rothieniurchus Woods, Inverness-shire. 



10. P. pinastri Nyl. Flora, 1869, p. 442. Thallus depressed, 

 roundly lobed, greenish-yellow ; lacinise plane, somewhat broad, 

 sometimes imbricate, the margins intensely citrino-sorediato ; medulla 

 deep citrine (K~, CaCl~). Apothecia as in the preceding species, 

 but very rare. Platysma juniperinum, subsp. pinastri Cromb. Journ. 

 Bot. 1872, p. 234. Platysnia jnnipcrinum var. pinastri Cromb. 

 Lich. Brit. p. 27 ; Leight. Lich. EL p. 102, ed. 3, p. 97. Cetraria 

 pinastri Gray, Nat. Arr. i. p. 432. Cetraria juiiiperina fa. pinastri 

 Hook. Fl. Scot. ii. p. 57 pro parte ; Sm. Eng/Fl. v. p. 220 ; Mudd, 

 Man. p. 79. Lichen pinastri Scop. Fl. Cam. ii. (1772) p. 382 ; 

 Dicks. Crypt, fasc. iii. p. 18; With. Arr. ed. 3, iv. p. 51 ; Eng. Bot. 

 t. 2111. 



This holds the same relation to P. juniperinum, of which it has usually 

 been considered a variety, as P. ulophylhtm does to P. scppincola, except 

 with respect to size. It is distinguished from the preceding by being 

 smaller, with broader and more appressed lobes, and by the bright citrine- 

 coloured marginal soredia. The colour of the medulla in both species, as 

 observed by Nylander, I. c., depends upon the presence of vulpuline. 

 Neither apothecia nor spermogones are seen in our British specimens. 



Hal). On the trunks of old firs and on larch pales in upland wooded 

 districts. Distr. Very local and rare in E. and N. England, and in the 

 Grampians, Scotland. Ii. M. : Framlingham, near Norwich, Norfolk ; 

 Holwick, Yorkshire ; Teesdale, Durham ; near Kendal, Westmoreland. 

 Ben Lawers, Perthshire ; Woods of Rothieniurchus, Inverness-shire. 



b. Thallus subascending, somewhat loosely affixed, discolorous ; 

 laciriije dilated. 



11. P. glaucum Nyl. Act. Soc. Linn. Bord. ser. 3, i. (1857) p. 295. 

 Thallus foliaceo-expanded, ascending, smooth or lacunoso-rugulose, 

 laciniate or laciniato-lobed, glaucous-grey or pallescent, beneath 

 brownish or blackish, paler at the circumference ; laciniae more or 

 less ascending, sinuate, crenate, or lacerate, often sorediate at the 

 margins (K+y ellowijsh , CaCl~). Apothecia marginal, adnate, 

 moderate or somewhat large, reddish-brown, the margin thin, evan- 

 escent ; spores ellipsoid, 0,006-9 mm. long, 0,035-50 mm. thick. 

 Nyl. Syn. i. p. 314, t. 8. f 35 ; Cromb. Lich. Brit. p. 27; Leight. 

 Lich. Fl. p. 102, ed. 3, p. 97. Cetraria c/lama Gray, Nat. Arr. i. 

 p. 433 ; Hook. Fl. Scot. ii. p. 57 ; Sm. Eng. Fl. v. p. 220 ; Tayl. in 

 Mack. Fl. Hib. ii. p. 154 ; Mudd, Man. p. 79, t. 1. f. 20. Lichen 

 ylaucus Linn. Sp. PI. (1753) p. 1148 ; Huds. Fl. Angl. p. 453 ; 

 Lightf. Fl. Scot. ii. p. 838 ; With. Arr. ed. 3, iv. p. 53 ; Eng. Bot. 



