468 LICHEXACEI. [lECANOEA. 



165. L. alpina Somm. Siippl. Fl. Lapp. (1826) p. 94 ; Xyl. Flora, 

 1869, p. 41;j. — Thallus indetermiuate, areolate or areolato-verru- 

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

 yellowish, then reddish, CaCl — , medulla 1 4- bluish); hypothallus 

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

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

 spores 8nfe, ellipsoid or ovoid, 0,009-1'A mm. long, 0,006-8 mm. 

 thick ; paraphyses not discrete, brownish towards the apices ; hj'- 

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

 with iodine. — Cromb. Grevillea, xix. p. 57, nou 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-(3 mm. long, about 0,001 mm. 

 thick. A closelv aUied species or perhaps onlv a vaiietv is L. Myrini 

 Nyl. Flora, 1869,' p. 413 {Parmelia Fr. Sum. Veg. Scand. (1845) p. 108), 

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

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

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

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



Hab. 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. cinereornfescens ]S'yl. Xot. Siillsk. pro F. et Fl. Fenn. 

 Forh. n. ser. v. (Ib60) p. 137. — Thallus subdeterminate, verrucosa 

 or rimoso-areolate, pale or dark greyish (K — , CaCl — , medulla I-|- 

 bluish) : hypothallus blackish. Apothecia small or submoderato, 

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

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

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

 moderate, brownish at the incrassate apices ; hy menial gelatine 

 bluish, the theca) wine-red with iodine. — Cromb. Grevillea, xix. 

 p. 57. — Urceolaria cinereornfescens 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 Xyl. I. c. — Thallus ochracco-reddish. Apothecia 

 with the thalline margin often flexuose. — Cromb. Lich. Brit. j). 55 ; 

 Leight. Lich. Fl. p. 211, ed. 3, p. 197. — Lichen diamartosVCahl.'Fl. 

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

 magnified fig.). 



