84 LECANO-LECIDEEI [lECIDEA 



Nylander (in Bull. Soc. Liim. Norm. ser. 2, vi. p. 278 (1872)) has 

 more recently suggested that this is only a state in which the thaUus 

 remains longer of a paler colovir, though at length in the herbarium 

 it becomes concolorous with that of the type. In the single British 

 specimen the areolse are somewhat scattered, with the hypothallus 

 very conspicuous. 



Mah. On a granitoid boulder in an alpine situation. — B. M. Near 

 the summit of Craig Calliach, Perthshire (the only locality). 



Var. y lutescens Nyl. I. c. — Thallus smoothish, pale-ochro- 

 leucous or whitish, subopaque. Apothecia at length superficial, 

 somewhat convex ; spores as in the preceding variety. — Psora 

 speetabilis var. yS lutescens Anzi Cat. Lich. Soudr. p. 66 (1860). 



Characterized by the paler thallus which appai-ently does not 

 become reddish in the herbarium. Nylander says that it often has 

 the aspect of L. margvnata Schaer., but differs from that in the internal 

 colour of the apothecia. The single British specimen is well fertUe, 

 both apothecia and spermogones being frequent. 



Hob. On a schistose rook in an alpiae locality. — B. M. Near the 

 STimmit of Ben Lawers, Perthshire. 



147. L. marginata Schsr. Enum. p. 115 (1850).— Thallus 

 pale-apricot-ooloured, tartareous, in irregular scattered patches, 

 rimose-areolate. Apothecia black, sessile, plane or tumid wdth 

 a thick prominent flexuose margin, at length immarginate ; hypo- 

 thecium pale ; spores oblong 0,010—11 mm. long, 0,0065—75 mm. 

 thick ; hymenial gelatine blue with iodine. — Cromb. Lich. Brit, 

 p. 83 ; Leight. Lich. Fl. p. 284 ; ed. 3, p. 289. Specimen not 

 seen. 



SoJ. On alpine rocks rare. CoUected on Ben Lawers by Adnural 

 Jones. 



148. L. fuscoatra Ach. Meth. p. 44 (1803) pro parte.— 

 Thallus determinate, areolate, the areolae plane or slightly convex, 

 brown, chestnut-brown or copper-coloured, somewhat shining 

 (K — , CaCl-f- reddish, medulla I — ); hypothallus black, usually 

 limiting the thallus. Apothecia moderate in size, black, ap- 

 pressed, at first plane and thinly margined, becoming often 

 convex and immarginate ; hypothecium dark-brown ; paraphvses 

 coherent, blackish at the apices; spores ellipsoid, or oblong- 

 eUipsoid, 0,010-16 mm. long, 0,005-7 mm. thick; hymenial 

 gelatine bluish then violet-wine-coloured with iodine. — Hook. Fl. 

 Scot. ii. p. 37 ; S. F. Gray Nat. Arr. p. 463 ; Hook, in Sm. Engl. 

 Fl. p. 174; Tayl. in Mackay Fl. Hib. iL p. 117; Cromb. lich. 

 Brit. p. 83 ; Leight. Lich. Fl. p. 287 ; ed. 3, p. 293 ; var. gihba 

 Wahlenb. Fl. Lapp. p. 475 (1812) ; f. gOba Leight. II. c. ; f. den- 

 dritiea Cromb. lich. Brit. p. 83 (1870). L. fumoaa Ach. Meth 

 p. 41 (1803) ; Hook. Fl. Scot. ii. I c. p. 37 ; S. F. Gray Nat. 

 Arr. i. p. 463 (excl. syn.) ; Mudd Man. p. 211. L. cechumeva 

 Ach. Meth. p. 42 (1803); Hook, in Sm. Engl. Fl. v. p. 175. 



