118 LECANO-IECIDEEI [bIATOKINA 



thin, unequal, pale or whitish (K — , CaCl— ), often evanescent. 

 Apothecia small, at first plane, with thin white epithaUine 

 margin, then convex and immarginate, pale-brown, sordid- or 

 pale-reddish, colourless within ; paraphyses concrete, pale at the 

 apices ; hypothecium colourless; spores 8-16 in the ascus, oblong 

 or oblong-fusiform, 1-2-septate, 0,009-16 nun. long, 0,004-5 mm. 

 thick; hymenial gelatine bluish then wine-red or violet with 

 iodine. — Lecidea cyrtella Ach. Meth. p. 67 (1803); S. F. Gray 

 Nat. Arr. i. p. 471 ; Cromb. Lich. Brit p. 72 ; Laght. lach. Fl. 

 p. 318 ; ed. 3, p. 341. L. atumala Ach. Syn. p. 38 (1814) pro 

 parte ; Hook, in Sm. Engl. Fl. v. p. 182 pro parte. Lichen 

 cyrtellus Sm. Engl. Bot. t. 21.5.5 (1810). 

 Exsicc. Larb. Idch. Hb. n. 173. 



Referred sometimes to Lecania (Lecanoracece) on account of the 

 thin epithaUine margin which disappears soon, the species becoming 

 wholly biatorine. The spores are usually of the 1-septate type of 

 Biatorina, though in the same apothecia there are to be found 

 2-septate spores like those of Bilimbia. 



Hob. On the bark of trees. — IHstr. Not unfrequent throughout 

 the British Isles. — B. M. Laimceston, Cornwall; Shanklin, I. of 

 Wight; CocHngton, Devon; Henfield, Sussex; Hadleigh Woods, 

 Southend, Essex ; Farmington and near Cirencester, Gloucestershire ; 

 Thame Park, Oxfordshire ; Malvern, Worcestershire ; Ayton, Cleveland, 

 Yorkshire ; Glen Falloch, Perthshire ; Riverstone, near Cork ; Mount 

 Shannon and Tervoe, Limerick ; Dromoland, Clare. 



15. B. Griffithii Massal. Rio. Lich. p. 134 (1852) pro parte; 

 Mudd Man. p. 176. — ThaUus effuse, thin, unequal or subgranular 

 and wrinkled, whitish or greyish-white (K + yellow, CaCl — ), 

 occasionally nearly obsolete. Apothecia small or submoderate, 

 adnate, plane, at length slightly convex, margined, brownish- 

 flesh-coloured, dull-brown or blackish, the margin thin, pale ; 

 paraphyses more or less discrete, dark or yellowish at the apices ; 

 hypothecium colourless ; spores fusiform or oblong, thinly 1- 

 septate, 0,010-20 mm. long, 0,035-45 mm. thick; hymenial 

 gelatine deep-blue then more or less sordid-wine-coloured with 

 iodine.— iicAen Griffithii Sm. Engl. Bot. t. 1735 (1807). Lecidea 

 Griffithii Hook, in Sm. Engl. Fl. v. p. 177 (1833); Tayl. in 

 Mackay Fl. Hib. ii. p. 120; Cromb. in Grevillea xxii. p. 11 (incl. 

 f. limitata Cromb.). L. tricolor Nyl. Lich. Scand. p. 207 (1861) 

 (non With, vide Grevillea xii. p. 60) ; Cromb. Lich. Brit p. 72 ; 

 Leight. Lich. Fl. p. 321 ; ed. 3, p. 337. Biatora mixta Fr. in 

 Yet. Acad. Handl. 1822, p. 267. 



Exsicc. Bohl. n. 119 ; Mudd n. 155 ; Leight. n. 60 (as Biatora 

 mixta) ; Larb. Lich. Hb. nos. 268, 345. 



The original specimens were collected by Griffith and preserved- 

 hi Withering's herbarium labelled Lichen comeus. Withering's 

 description and figure of L. comeus do not agree with these specimens 

 (see p. 9), as was pointed out by Smith (Engl. Bot. 1. 1735), who 



