422 LICHENACEI. [leCANORA. 



Lichen Swartzii Ach. Prodr. (1798) p. 55, t. 1. lig. 2 (uon bonum) ; 

 Dicks. Crypt, fasc. iv. p. 23. 



The form of the thallus at the circumference and that of the apothecia 

 are the distinguishing marks of this variet}-. In the former respect, how- 

 ever, the radii are visible only in entire specimens and are sometimes 

 absent even in the growing plant. The apothecia are occasionally much 

 deformed. 



Hah. On rocks in mountainous districts. — Distr. Only very sparingly 

 on the S. and X. Grampians, Scotland. — B. M. : Ben Cruachan, Argyle- 

 shire ; Morrone, Braemar, Aberdeenshire. 



Subsp. 1. L. subradiosa Xyl. Flora, 1872, p. 549. — Thallus and 

 apothecia as in the type, but the former with different reaction. 

 Thallus CaCl + orange passing into reddish. Apothecia (epitheciiim) 

 CaCl + yellow. — Cromb. Grevillea, xix. p. 60. 



Xylander /. c. says that this may be only a state of L. glaucoma, mixed 

 up •u-ith which it frequently occurs in the E. Pyrenees, though not in 

 the verv few British specimens as yet detected. These, apart from the 

 reactions, from a diagnosis given me by Mr. Johnson present no special 

 marks of distinction. 



Hah. On stones of a wall in an upland district. — Distr. Very local and 

 scarce in N.E. England (Sinderhope, East AUendale, Northumberland). 



Subsp. 2. L. bicincta Xyl. Act. Soc. So. Fenn. vii. (1863) p. 398. 

 — Thallus as in the type. Apothecia glauco-pruinose, with double 

 margin, a thalline and within this a black proper margin ; spores 

 0,011-14 mm. long. 0,007-8 mm. thick. — Lecanora bicincta Ram. 

 Mus. Xat. Hist. Mem. siii. (1825) p. 248. 



At least a good subspecies well characterized by the zeorine apothecia, 

 though in other respects agreeing with L. glaucoma. The type does not 

 occur in Britain, but only the variety that follows. 



Yar. ft. lecideina Cromb. Grevillea, xviii. (1890) p. 68. — Apo- 

 thecia small, lecideoid, black, more or less pruinose, the proper 

 margin slightly prominent and flexuose. — Lecanora rimosa b. leddina 

 Schaer, Enum. (1850) p. 71. L. glaucoma var. ccerulata (Flot.) 

 Leight. Lich. Fl. p. 215, ed? 3, p. 204. 



Probablv only a form, as in the single British specimen seen a few 

 young apothecia are zeorine. Otherwise they are lecideiue, convex and 

 aggregate, with the thalline margin obliterated. 



Hab. On a quartzose rock in a mountainous district. — Distr. Found 

 only very sparingly on one of the N. Grampians, Scotland. — B. M. : 

 Morrone, Braemar, Aberdeenshire. 



101. L. subcarneaAch. Licb. Univ. (1810) p. 365.— Thallus sub- 

 determinate, yellowish- white, rimoso-arcolato-granulatc(K + yellow, 

 then deep orange-red). Apothecia moderate, jdane or convex, some- 

 times conglomerate and diiforra, flesh-coloured or livid-testaceous, 



