PLATYSMA.] CETRARIEI. 221 



from the preceding in the narrower laciniae, connivent at the margins, 

 and when fertile in the position of the apothecia. With us it is sterile. 



Hcib. On the ground among mosses in alpine places. Distr. Known 

 only from the summits of some of the higher X. Grampians, Scotland. 

 B. M. : Cairutoul and Cairngorm, Braemar, Aberdeanshire. 



b. Thallus subascending or appressed, more or less closely 

 adherent, subdiscolorous ; Jacinise somewhat narrow. 



3. P. ssepincola Nyl. Act. Soc. Linn. Bord. se'r. 3, i. (1856) 

 p. 295. Thallus small, smooth, laciniato-lobed, olive- or chestnut- 

 brown, beneath paler ; lacinice decumbent or ascending, somewhat 

 plane, the margins undulato-sinuate or crenate (K~, CaCl~). 

 Apothecia submarginal, adnate, small or moderate, dark-brown or 

 subconcolorous, shining, the margin thin, crenate ; spores ellipsoid 

 0,006-10 mm. long, 0,005-6 mm. thick. Cromb. Lich. Brit. p. 26 

 pro parte ; Leight. Lich. Fl. p. 100 pro parte, ed. 3, p. 94 pro parte. 

 Lichen sce.pincola Ehrh. Phyt. (1780) n. 90; Eng. Bot. t. 2386. 

 f. 2. To this, from specimens in herbaria, is not referable the 

 Lichen or Cetraria sepincola of other British authors, which refers 

 to the following species. 



A small plant, with the thallus rosulate, pulvinate, or sometimes effuse, 

 and generally smaller when fertile than when barren. The small and 

 crowded apothecia are rare in this country, as also the spermogones, 

 which have the spermatia 0,000 mm. long, scarcely 0,001 mm. thick. 



Hab. On old pales and branches of trees, mostly firs, in mountainous 

 districts. Distr. Very local and scarce, in the N. Grampians, Scotland ; 

 very doubtfully in N. England. B. M. : ? Teesdale, Durham. Glen 

 Q.uoich and Glen Dee, Braemar, Aberdeenshire. 



4. P. ulophyllum Nyl. Flora, 1869, p. 442. Thallus moderate, 

 smooth or isidio-furfuraceous, lacero-laciniate, greyish- or pale chest- 

 nut-brown, beneath paler ; laciniae subappressed or ascending, some- 

 what narrow, variously divided, the margins undulato-crisp and 

 white sorediato-pulverulent (K~, CaCl.~). Apothecia submarginal, 

 small, the margin subcrenulate or entire ; spores as in the preceding 

 species. Cromb. Grevillea, xii. p. 75. Platysma scvpincola var. 

 ulophyllum Leight. Lich. Fl. p. 100, ed. 3, p. 95. Cetraria sepin- 

 cola ft. ulophyUa Ach. Meth. (1803) p. 297. Cetraria scepincola 

 Gray, Nat. Arr. i. p. 432 ; Hook. Fl. Scot. ii. p. 57 ; Sm. Eng. Fl. 

 v. p. 220 ; Mudd, Man. p. 80. Lichen sepincola Dicks. Crypt, fasc. 

 iii. p. 18 ; With. Arr. ed. 3, i. v. p. 73 ; Eng. Bot. t. 2386. f. 1. 

 Brit. Exs. : Leight. n. 45 ; Mudd, nos. 55, 56. 



From P. sapincola, of which it has generally been regarded a variety, 

 this is distinguished by the longer and broader, sometimes isidio-furfu- 

 raceous laciniae, which when fully developed are somewhat flaccid, and 

 bv their crisp sorediate margins. The states by which it has been sup- 

 posed to be connected with the preceding are merely young and non- 

 isidiiferous conditions of this plant. The small apothecia have only once 

 been met with in this country rightly developed. 



