84 LKCANO-LECIDEEI [lECIDKA 



N^'lander (in ]5ull. Soc. Linn. Norm. ser. 2, vi. p. 278 (1872)) has 

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

 remains longer of a paler colour, tliough at length in the herbarium 

 it becomes concolorous witli that of the type. In the single ]iritish 

 specimen the areolas are somewhat scattered, witli the hypothallus 

 very conspicuous. 



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

 the smnmit 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 

 apectabilis var. ^ lutescens Anzi Cat. Lich. Soudr. p. 6() (1860). 



Characterized by the paler thallus which apparently does not 

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

 the aspect of L. marginata Schoer., but differs from that in the internal 

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

 both apothecia and spermogones being frequent. 



Hah. On a schistose rock in an alpine locality. — B. M. Near the 

 summit of Ben Lawers, Perthshire. 



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

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

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

 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. 



Hab. On alpine rocks rare. Collected on Ben Lawers by Admiral 

 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 -j- 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 ; paraphyses 

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

 ellipsoid, 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. ii. 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. gihha Leight. II. c. ; f. den- 

 dritica Cromb. Lich. Brit. p. 83 (1870). L. fumosa Ach. Meth. 

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

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

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



