404 Rev. "W. A. Leighton on new British Lichens. 



Lecidea Caradocensis, Leight. Thallus cartilaginous, dull 

 grey-greenish olive, rimoso-areolate, granulato-verrucose ; scales 

 convex, crimped or wrinkled ; apothecia dull black, sessile on 

 the areolae, more or less imbedded; sporidia elliptico-fusiform, 

 3-septate, hyaline. 



Lecidea Caradocensis, Leight. Lich, Brit. Exs. 160! (1854); Nylander, 

 Prodr. Lichen, p. 137 (1857); Enum. Lich. p. 126 (1858). 



Discovered by me in 1854, in great abundance, growing with 

 Lecidea ostreata, Hoffm., on oak palings surrounding the south 

 and west bases of Caer Caradoc, Shropshire. Aymestry !, Here- 

 fordshire (1864), Rev. J. F. Crouch. North side of Gopsall 

 Wood !, near Twycross, Leicestershire (1864), Rev. A. Bloxam. 



Thallus cartilaginous, moderately thick, forming often large, 

 diffused, irregular patches, of a pale grey-greenish olive-colour, 

 rimoso-areolate, consisting of minute, adnate, roundish, convex, 

 smooth scales, rounded or more or less minutely crenulate at the 

 margins, densely crowded and aggregated closely together, so 

 as to present a crimped or wrinkled granulato-verrucose appear- 

 nnce, generally smooth, but, when rubbed, becoming somewhat 

 pulverulent. Apothecia sessile on the areolae, often appearing 

 more or less deeply imbedded, by reason of the thalline scales 

 forming a prominent crimped border around them, very small, 

 numerous, single, pr more frequently crowded, confluent, and 

 difformed. Disk flattish, of a dull brownish-black colour. 

 Margin thin, irregular, and very flexuose, slightly prominent, 

 and more or less incurved, of the same colour as the disk. 

 Paraphyses closely conglutinated into a brown mass. Hypothec 

 cium dark brown. Asci inconspicuous. Sporidia minute, ellip- 

 tico-fusiform, 3-septate, hyaline, the number not ascertained. 



Plate IX. fig. 6. Vertical section of apothecium and thallus. 

 fig. 7. Sporidia, magnified 1200 times linear, 

 fig. 10. L. Caradocensis, natural size. 



Lecidea Friesii, Ach. Thallus cartilaginous, brownish olive, 

 diffuse, glebuloso-squamulose ; scales convexo-gibbous, smooth 

 and polished ; apothecia black, prominently sessile on the scales ; 

 sporidia ellipsoid, simple, hyaline. 



Lecidea Friesii, Ach. in Liliebl. Sv. Fl. p. 610 (1816); Nyl. Scand. p. 243 



(1861). 

 myrmecina, Fr. in Vet. Ak. Handl. p. 257 (1822) ; Lich. Eur. p. 344 



(1831); S. V. S. p. 114 (1846); Exs. 28; Nyl. Prodr. p. 136(1857); 



Enum. p. 126 (1858); 

 Psora Caradocensis, Mudd (non Leight.), Mudd, Man. p. 169, t. 3. f. 61 



(excl. syn.)(1861); Exs. 142! 



On old oak-trees and stumps. Farndale ! Stogdale ! Kildale I 

 Baysdale ! (in the latter locality mixed with Lecidea ostreata, 

 Hoffm.) ; all in Cleveland, Yorkshire ; Mr. W. Mudd. 



