LECANORA.] LECANO-LECIDEEI. 413 



Northumberland. Killin, Perthshire; Durris, Kincardineshire ; Crathie 

 and Glen Dee, Braemar, Aberdeenshire : Rothiemurchus, Inverness-shire. 

 Carrigaline, co. Cork ; Killarney, co. Kerry. 



Form pleorytis Ach. Syn. (1814) p. 161 (excl. syn.). Thallus 

 determinate, thickish, granulate, yellow. Apothecia crowded, con- 

 colorous, the thalline margin inflexed and crenulate. Cromb. Gre- 

 villea, xviii. p. 69. Parmelia varia ft. pleorytis Ach. Meth. (1803) 

 p. 178. 



Differs chiefly, in the character of the thalline margin, which is as if 

 incised. This, however, is less visible in the young apothecia of the only 

 British specimen (fragmentary). 



Hab. On old pales in an upland district. Distr. Only very sparingly 

 in the S. Grampians, Scotland. B. M. : Lawers, Killin, Perthshire. 



116. L. conizaea Nyl. Flora, 1872, p. 249. Thallus effuse, 

 thickish, leproso-pulverulent, whitish-yellow (K + yellow, CaCl ). 

 Apothecia lecanorine, small or moderate, plane or somewhat convex, 

 pale or pale flesh-coloured, at length brownish ; the thalline margin 

 entire or flexuose, somewhat thickish, pulverulent ; spores ellipsoid, 

 0,010-14 mm. long, 0,0045 mm. thick ; hymenial gelatine bluish, 

 then tawny-yellow with iodine. Cromb. Trans. Essex Field Club. 

 iv. p. 64. Lecanora varia var. coniza>a Cromb. Lich. Brit. p. 52 ; 

 Leight. Lich. Fl. p. 193. Lecanora expalhns var. (3. conizcea Ach. 

 Lich. Univ. (1810) p. 374. Lecanora lutesc-ens Leight. Lich. Fl. 

 ed. 3, p. 184 pro parte. Lecanora sarcopis subsp. homopis (non Nyl.) 

 Cromb. Journ. Bot. 1873, p. 133. Lecidea farinaria Borr. Eng. 

 Bot. Suppl. t. 2727. Brit. Exs. : Croaib. n. 163 ; Leight. n. 378. 



Well distinguished from L. varia by the paler, leprose thallus and the 

 pulverulent margin of the apothecia. In a young state the thallus is 

 thinnish, but subsequently becomes rather thick and spreads extensively. 

 The apothecia are numerous when present (for the plant is often sterile), 

 and become dark-brown and flexuose in age. 



Hab. On old pales, chiefly oak, in lowland and upland districts. Distr. 

 Local in S., Central, W. and N. England, but abundant where it occurs. 

 B. M. : Albourne, Sussex ; Finchley, Middlesex ; Reigate, Surrey ; 

 Epping Forest, Essex ; Elstree, Herts ; Penshurst, Kent ; Gopsall Park, 

 Leicestershire ; Stableford, Shropshire ; Urpeth Valley, Durham ; Asby, 

 Cumberland. 



117. L. conizseoid.es Nyl. ex Cromb. Journ. Bot. 1885, p. 195. 

 Thallus effuse, somewhat thickish, leprose or subleprose, pale- or 

 whitish-yellow (Kf+ yellowish, CaCl ). Apothecia lecanorine, 

 submoderate, innato-sessile, pale-yellow or livid-brownish ; the thai- 

 line margin persistent, crenulate and often inflexed ; spores oblong, 

 0,009-11 mm. long, 0,005-7 mm. thick; hymenial gelatine bluish, 

 then sordid with iodine. 



Intermediate between L, varia and L. conizcea, to which latter the 

 thallus is almost similar, though the spores are more turgid. From L. 



