468 UCHENACEI. [LECANORA. 



165. L. alpina Somm. Suppl.Fl. Lapp. (1826) p. 94 ; Nyl. Flora, 

 1869, p. 413. Thallus indeterminate, areolate or areolato-verru- 

 cose, greyish or leaden-greyish ; areoloe rounded or angulose (K + 

 yellowish, then reddish, CaCl , medulla I + bluish); hypothallus 

 black. Apothecia immersed or at length superficial, plane, reddish 

 or reddish-black; the thalline margin prominent, subpersistent ; 

 spores 8nae, ellipsoid or ovoid, 0,009-13 mm. long, 0,006-8 mm. 

 thick ; paraphyses not discrete, brownish towards the apices ; hy- 

 menial gelatine deep blue, the thecse at length violet or wine-reddish 

 with iodine. Cromb. Grevillea, xix. p. 57, non Leight. Grevillea, i. 

 p. 125. Lecanora cinereo-rufescens Cromb. Lich. Brit. p. 55, 

 Leight. Lich. Fl. p. 211, ed. 3, p. 197, is entirely referable to this 

 species. 



A well-marked plant differing at once from all states of L. cinerea, 

 with which it is so far comparable, in the positive reaction of the medulla 

 with iodine. In the single British specimen, which is well fertile, the 

 areolae are contiguous, though in more northern regions they are often 

 discrete, when the hypothallus is more visible. The spermogones have 

 the spermatia cylindrical, straight, 0,004-0 mm. long, about 0,001 mm. 

 thick. A closely allied species or perhaps only a variety is L. Myrini 

 Nyl. Flora, 1869, p. 413 (ParmeliaFr. Sum. Veg. Scand. (1846) p. 108), 

 distinguished chiefly by the yellowish thallus, the black apothecia, and 

 the rather shorter spermatia. This is said by Leighton (Lich. Fl. ed. 3, 

 p. 173) to have been gathered at Bannouth ; but the specimen in Hb. 

 Salwey referred to in Grevillea, i. p. 125, is from Norway. 



Hob. On a mica-schist rock in an alpine situation. Distr. Very local 

 and scarce on one of the S. Grampians, Scotland. B. M. : Ben Lawers, 

 Perthshire. 



166. L. cinereorufescens Nyl. Not. Sallsk. pro F. et Fl. Fenn. 

 Forh. n. ser. v. (1866) p. 137. Thallus subdeterminate, verrucose 

 or rimoso-areolate, pale or dark greyish (K , CaCl , medulla 1 + 

 bluish) ; hypothallus blackish. Apothecia small or submoderate, 

 at first innate and concave, then somewhat prominent and plane, 

 brownish- or dark-red ; the thalline margin entire ; spores 8nae, 

 ellipsoid, 0,012-24 mm. long, 0,007-16 mm. thick; paraphyses sub- 

 moderate, brownish at the incrassate apices ; hymenial gelatine 

 bluish, the thecae wine-red with iodine. Cromb. Grevillea, xix. 

 p. 57. Urceolaria cinereorufescens Ach. Lich. Univ. (1810) p. 677. 



In some respects related to the preceding, but differs, among other 

 characters, in the negative reaction of the cortical layer with K. The 

 type has not yet occurred with us, but only the following form. 



Form diamarta Nyl. I. c. Thallus ochraceo-reddish. Apothecia 

 with the thalline margin often flexuose. Cromb. Lich. Brit. p. 55 ; 

 Leight. Lich. Fl. p. 211, ed. 3, p. 197. Lichen diamart us Wahl. Fl. 

 Lapp. (1812) p. 414. Lichen sinopicus Eng. Bot. t. 1776 (lower 

 magnified fig.). 



