ROCCELLA.] ROCCELLEI. 183 



p. 81, ed. 3, p. 74. Lichen Iioc<^eIIa Eng. Bot, t. 211, is true Eoccella 

 tinctoria DC. (minor), but the figure is drawn from an exotic speci- 

 men. — Brit. Exs.: Mudd, n. 48; Larb. Ca3sar. n. 11; Lich. Hb. 

 n. 122 ; Cromb. n, 14. 



States with the branches more elongate and scarcely sorediiferous have 

 been confounded with R. tincforia, whose range, ho\\-ever, does not extend 

 so far north as our islands. It diliers in its smaller .size ( 1-3 inches in 

 height), the less opaque thai] us, which is more thinly branched and sore- 

 diiferous (not farinaceous) on the surftice, as also in the smaller lecideine 

 apothecia. It is very rarely fertile in Great Britain. The spermogones, 

 which are occasionally present in our specimens, have the sterigmata 

 slender and the spermatia arcuate, 0,013-10 mm. long, scarcely 0,001 mm. 

 thick. Our fig. 37 shows that the p-lobulose or ellipsoid gonidia are 

 simple, or two or more concatenate. The papill?eform cells of the cortex 

 are sprinkled with the powder (granulations) of the pigmentary matter. 



Huh. On rocks, rarely on walls in maritime localities. — Distr. Not un- 

 common in the Channel Islands and in S.England; extremely rare in 

 S.W. Scotland. — B. M. : St. Brelade's Bay, La Moye and Noirmont, 

 Island of Jersey ; Petit-Bot Bay, Island of Guerasey. Godshill Church 

 and Bembridge, Isle of Wight ; Portland Island, Dorsetshire ; liolt Head, 

 Lyumouth, and Valley of Rocks, Lynton, Devonshire ; Tintagel Castle, 

 Lamorna Cove, Pentire and St. Minver, Cornwall ; St. Mary's, Scilly 

 Islands. Millport, Cumbrae Island, Frith of Clyde. 



Form tenuior Xyl. ex Leight. Lich. Fl. ed. 3 (1879) p. 74. — 

 Thallus somewhat elongate, very slender, much branched towards 

 the apices. Apothecia not seen. — Eoccella fuciformis (errore) f. 

 tenuior Cromb. Grevillea, xv. p. 47. 



Differs from the type in the more slender, elongate, and apically 

 branched thallus. It is plentifully sorediate, but apparently never fertile. 



Hab. On rocks in maritime situations. — Distr. Local and scarce in the 

 Channel Islands. — B. M. : La Moye, Island of Jersey. 



2. R. fuciformis DC. Fl. Fr. ii. (1805) p. 335.— Thallus com- 

 pressed, much branched, glaucous-wliite or glaucous-brown, often 

 sorediiferous; branches dichotomously laciniate (CaCl— , soredia 

 -|-reddi.sh, medulla I + bluish). Apothecia moderate, superficial, 

 lecanorine, black, pruinose, the thulline margin at length nearly 

 excluded ; spores fusiform or oblongo-fusiforra, 0,02U-30 mm. long, 

 0,004-6 mm. thick. — Gray, Xat. Arr. i. p. 426 : Sm. Eng. Fl. v. 

 p. 222; Tavl. in Mack. Fl. Hib. ii. p. 83; Mudd, Man. p. 76, t. 1. 

 f. 18 ; Cromb. Lich. Brit. p. 23 ; Leight. Lich. Fl. p. 82, ed. 3, 

 p. 74, Lichen fuciformis Linn. Sp. PL (1753) p. 1614; Dicks. 

 Crypt, fasc. iii. p. 17 ; AVith. Arr. ed. 3, iv. p. 51 ; Eng. Bot. t. 728. 

 Lichenoides fuci forme tinctorium, cornicidis lonqiorihus et acutioribiis 

 Dill. Muse. 168, t. 23. f. 6\.—Brit. Exs. : Leight. u. 171 ; Larb. 

 Caesar, n. 12; Lich. Hb. n. 123; Cromb. nos. 15, 125. 



From E. phi/copsis, with wliich in this country it is usually found asso- 

 ciated, this differs in its conipre.-sed, broader, generally longer thallus, 

 and in the fructification. It varies considerably in size, occa>ionally 



