ROCCELLA. ] ROCCELLEI. 183 
p- 81, ed. 3, p.74. Lichen Roccella Eng. Bot. t. 211, is true Roceella 
tanctoria DC. (minor), but the figure is drawn from an exotic speci- 
men.— Brit. Kvs.: Mudd, n. 48; Larb. Cesar. n. 11; Lich. Hb. 
n. 122; Cromb. n. 14. 
States with the branches more elongate and scarcely sorediiferous have 
been confounded with ZR. tixctoria, whose range, however, does not extend 
so far north as our islands. It differs in its smaller size (1-8 inches in 
height), the less opaque thallus, which is more thinly branched and sore- 
diiferous (not farinaceous) on the surface, 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, 0,013-16 mm. long, scarcely 0,001 mm. 
thick. Our fig. 87 shows that the globulose or ellipsoid gonidia are 
simple, or two or more concatenate. The papilleform cells of the cortex 
are sprinkled with the powder (granulations) of the pigmentary matter. 
Hab. On rocks, rarely on walls in maritime localities— Distr. Not un- 
common in the Channel Islands and in 8. 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 Guernsey. Godshill Church 
and Bembridge, Isle of Wight; Portland Island, Dursetshire ; Bolt Head, 
Lynmouth, 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 Nyl. ex Leight. Lich. Fl. ed. 3 (1879) p. 74.— 
Thallus somewhat elongate, very slender, much branched towards 
the apices. Apothecia not seen.—Roccella 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.—Dist7. 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-white or glaucous-brown, often 
sorediiferous ; branches dichotomously laciniate (Ca Cl—, soredia 
+reddish, medulla I+bluish). Apothecia moderate, superficial, 
lecanorine, black, pruinose, the thalline margin at length nearly 
excluded ; spores fusiform or oblongo-fusiform, 0,020-30 mm. long, 
0,004-6 mm. thick.—Gray, Nat. Arr. i. p. 426; Sm. Eng. Fl. v. 
p- 222; Tayl. in Mack. FI. 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. fase. iii. p. 17; With. Arr, ed. 3, iv. p.51; Eng. Bot. t. 728. 
Lichenoides fuciforme tinctorium, corniculis lonqiorihus et acutioribus 
Dill. Muse. 168, t. 23. f. 61.—Brit. Evs.: Leight. n. 171; Larb. 
Cesar. n. 12; Lich. Hb. n. 123; Cromb. nos. 15, 125. 
From 2. phycopsis, with which in this country it is usually found asso- 
ciated, this differs in its compressed, broader, generally longer thallus, 
and in the fructitication, It varies considerably in size, occasionally 
