LECAN'ORA.] LECANO-LEClDtE;. 42'-i 



thinly pruinose (epithecium CaCl — ); thethalline margin undulate, 

 at length nearly obliterated : spores ellipsoid, 0,011-13 mm, long, 

 0,006-7 mm. thick ; epithecium granulose, brown ; hymenial 

 gelatine bluish, the thecae violet with iodine. — Lcight. Lich. Fl. 

 p. 216, ed. 3, p. 205. — Lecanora glaucoma var. suhcarnea Mudd, 

 Man. p. 153; Cromb. Lich. Brit. p. 50. Led di^a suhcarnea Sm. 

 Eng. Fl, V. p. 184. Lichen subcarneus Sw. Yet. Ak. Handl. 1791, 

 p. 126. Liclun pallescens With. Arr. ed. 3, iv. p. 2, pro parte. 



Usually regarded as a variety of the preceding species, but, among 

 other characters, at once diifers in the reaction of the epithecium. The 

 thallus in entire specimens is subradiate at the circumference, but is 

 usually widely expauded. The apothecia are numerous, and occasionally 

 become substipitate. 



Ilab. On rocks in maritime and upland mountainous districts. — Distr, 

 Local in the Channel Islands, X. Wales, N. England, on the Grampians, 

 and in X.E. Scotland. — B. M. : Boulay Bay, Inland of Jersey: Island of 

 Alderney. Barmouth. Merionethshire : Keighley and Ayton, Cleveland, 

 Yorkshire. Craig TuUoch, Blair Athole, Perthshire ; near Porlelhen, 

 Kincardineshire ; Morroue, Braemar, Aberdeenshire. 



102. L. fuscescens Xyl. Flora, 1872, p. 552, nota 1. — Thallus 

 subdeterminate, thinly granulose, whitish or greyish (K4- yellowish, 

 CaCl — ); hypothallus thin, brownish-black. Apothecia small or 

 submoderate, adnate or adnato-sessile, plane, thinly margined, pale- 

 brown or blackish, internally whitish ; paraphyses submoderate, 

 blackish or brownish at the clavate apices ; spores globular or sub- 

 globose, 0,006-9 mm. long, (',0uo-7 mm. thick ; hymenial gelatine 

 bluish, the thecfe at length wine-coloured or tawny-reddish with 

 iodine. — Cromb. Journ. Bot, 1S75, p, 140 : Leight. Lich. Fl. ed. 3, 

 p. 200. — Lecidea fuscascens Scmm. Suppl. Fl. Lapp. (1826j p. 161. 



Formerly regarded by authors as a Lecidea (Biatora), this, as pointed 

 out by Xy lander /. c, is in reality a Lecanora with gonidia intruded in 

 the margin of the apothecia. In a young state these are truly lecanorine, 

 though afterwards they become convex and immargiuate so as to appear 

 biatoroid. In the British specimens, which are well fertile, the thallus 

 is rather scattered, with the hypothallus predominant. According to 

 Th. M. Fries (Lich. Scand. p. 461) the spermatia are •' long, acicular, 

 curved.'' 



Hab. On trunks of birch in a mountainous district. — Di-^fr. Only 

 sparingly on one of the X'. Grampians, Scotland. — B. M. : Morroue, 

 Braemar, Aberdeenshire. 



c. Thallus uniform, K — . 



103, L. -ambrina Xyl. Bull. Soc. Bot. t. xiii. (1866) p. 369.— 

 Thallus subefFuse, thinnish, granulato-unequal, sordid-greenish or 

 grevish(K — , CaCl — ). Apothecia somewhat small, plane, umbrine- 

 browii, at times slightly cajsio-sufFused ; the thalliue margin thin, 

 whitish, subcrenulate ; spores 0,U08-12 mm. long, 0,0'J5-6 mm. 

 thick ; paraphyses thickish, jointed, brownish at the clavate apices ; 



