438 LicnEXACEi. [lecanoka. 



condition of this with small apothecia is var. k. illusoria Ach. Lich. 

 Uuiv. p. 380, Cromb. Lich. Brit. /. c. (non Leight. Lich. Fl. //. c). The 

 apothecia are variable in -size, usually very numerous so as almost to 

 obliterate the thallus, and at times in old plants several are conglomerate. 

 The sperm( gones, which are also frequent, are punctiform, immersed, 

 dark-brovrn or blackish. 



Hah. On rocks, boulders, and walls in maritime and mountainous dis- 

 tx-icts. — Distr. General in Great Britain and Ireland, plentiful among the 

 Grampians, Scotland ; rare in the Channel Islands. — B. M. : La Move, 

 Island of Jersey. Bult Head, S. Devon ; near Penzance, Cornwall ; 

 Aberdovey, Merionethshire ; Ne-sclifie Hill, Shropshire ; Ciiffiig, ( leve- 

 land, Yorkshire ; Eglestone, Durham ; Keswick, Cumberland. Appin, 

 Argyleshire, Ben Lawers and Craig TuUoch, Perthshire ; Portlethen, 

 Kincardine.«hire ; Ben-naboord, Braemar, Aberdeenshire : Ben Nevis, 

 Inverness-shixe. Kinsale, co. Ctrk; Derryquin, near Dunkerron, co. 

 Kerry ; Doughruagh mts. ; Connemara, co. Galway. 



Form 1. eflBorescens Cromb. Grevillea, xviii. (1890) p. 69. — 

 Thallus sprinkled here and there with pale-yellowish soredia. 

 Apothecia small, plane or somewhat convex, usually immarginate. 



Apparently a rare condition not previously observed, but resulting no 

 doubt from the habitat. The soredia are yellowish with K. It is very 

 diti'erent from L. epanora. 



Hnb. On .shaded stones of a schistose wall in an upland district. — 

 Distr. Onlv verv sparingly on one of the Central Grampians, Scotland. 

 — B. M. : Craig" Tulloch, Blair Athole, Perthshire. 



Form 2. alpigena Schaer, Enum. (1850) p. 81. ThaUus rimoso- 

 areolate, pale v ellow. Apothecia large, apprcssed, plane or convex, 

 concolorous, the thalline margin paler, llexuose. — Leight. Lich. Fl. 

 p. 197, ed. 3, p. 181. — Lecanora varia var. t. alijigena, Ach. Lich. 

 Univ. (1810) p. 381 (excL vars.). 



Evidently confluent with the tvpe, differing chiefly in the larger paler 

 apothecia. These at length become convex, more or less aggregate, with 

 the thalline margin excluded. 



Sab. On schistose rocks in alpine places. — Distr. Very rare on one 

 of the S. Grampians, Scotland. — B. M. : Ben Lawers, Perthshire. 



Form 3. Enholobosa Cromb. — Thallus effuse, thin, granulate, 

 greenish-yellow, often nearly obsolete. Apothecia small, numerous, 

 convex or subglobose, greenish-yellow or sub-brownish, immar- 

 ginate. — Lecanora lioJyptrfpa var. c. cowjlohata (non Flot.) Mudd, 

 Man. p. 152, form conjlohata (non Somm.) Leight. Lich. Fl. p. 197, 

 ed. 3, p. 18U. Lecanora varia var. i^olytropa form conr/lobata (non 

 Somm.) Cromb. Lich. Brit. p. 52. — Brit. Exs. : Leight. n. 152; 

 Mudd, n. 120. 



In this form, as observed by Leighton //. c, the crowded apothecia are 

 vet distinct, though at times scattered and confluent. The thallus is 

 sometimes scarcely visible, when, except in the irhape of the apothecia, it 

 dillers little from the so-called var. illusoria Ach. As the young apothecia, 



