86 LECANO-LECIDEEI [lECIDEA 



Hah. On schistose rocks in mountainous districts. — Distr. Local 

 and scarce in N. England, the N. Grampians, Scotland, and in W. 

 Ireland ; no douht to be detected elsewhere. — B. M. Alston, Cumber- 

 land ; Morrone, Braemar, Aberdeenshire ; near Letterfrack, Conne- 

 mara, Galway. 



Var. y Mosigii Nyl. Lich. Scand. p. 230 (1861).— Thallus 

 chestnut- or greyish-brown, smoothish. Apothecia moderate or 

 somewhat large, innate, plane, thinly margined, pruinose, the 

 margin often flexuose and naked. — f. Mosigii Leight. Lich. Fl. 

 p. 288 ; ed. 3, p. 294 ; f. deusta Leight. Lich. Fl. p. 289 ; ed. 3, 

 I. G. L. fumosa var. Mosigii Ach. Lich. Univ. p. 157 (1810) ; 

 var. /3 deusta Mudd Man. p. 211 (1861) (non Fries). 



Exsicc. Leight. n. 240 pro parte. 



Differs chiefly in the pruinose apothecia which are either somewhat 

 scattered or crowded and at times confluent. The thallus is limited 

 by the hypothaUus, which is also occasionally more or less visible 

 between the areolae. 



Sab. On granitic and schistose rocks in maritime and mountainous 

 districts. — IHstr. Only here and there in Great Britain ; rare in S. 

 and W. Ireland (Connemara, Galway, fide Leight.) ; not found with, 

 certainty in the Channel Islands. — B. M. Eoughton, Cornwall; N. 

 Derbyshire ; Dolgelly, Merioneth ; The Wrekin, Shropshire ; near 

 Ayton, Cleveland, Yorkshire ; Achosragan Hill, Appin, Argyll ; Craig 

 CaUiach, Perthshire ; near Portlethen, Kincardineshire ; Morrone, 

 Braemar, Aberdeenshire ; near Bantry, Cork. 



149. L. nigrogrisea Nyl. in Flora Lxii. p. 357 (1879). — 

 Thallus indeterminate, moderate or thinnish, granulate-areolate, 

 greyish ; the areolae subconvex, somewhat shining (K — , CaCl — , 

 medulla I — ). Apothecia at first plane and thinly margined, 

 then somewhat convex and almost immarginate, black ; epithecium 

 and perithecium blackish ; hypothecium brown ; spores ellipsoid- 

 oblong, 0,007-11 mm. long, 0,004—5 mm. thick; hymenial 

 gelatine bluish, the asci at length tawny-wine-coloured, with 

 iodine. — Cromb. in GrevDlea viii. p. 113. 



Distinguished from all states of L. fuscoatra by the absence of 

 any thaUine reactions and the smaller spores. In the specimen 

 seen, the apothecia are Soruewhat crowded. The spermogones, 

 occasionally present, have the spermatia straight, 0,0(J6-^ mm, long, 

 0,0006 mm. thick. 



Hah. On a mica-schist wall in an upland district. — B. M. Craig 

 Tulloch, Blair Athole, Perthshire (the only locality). 



150. L. macula Tayl. in Mackay Fl. Hib. ii. p. 115 (1836) ; 

 Nyl. in Flora lxii. p. 361 (1879). — Thallus determinate, thin, 

 areolate-rimose, smooth, the areolae minute, concave, then somewhat 

 plane, more or less scattered, pale- or olive-greyish (K — , CaCl — ) ; 

 hypothallus very thin, black. Apothecia minute, innate, plane, 

 margined, black, the margin slightly prominent ; paraphyses 

 concrete ; epithecium bluish-brown ; hypothecium brown ; spores 



