Ser. Melanospermeve. Fam. Dktyotea. 



Plate CCCXLI. 



ZONARIA PARVULA, Grev. 



Gen. Char. Root < coated with woolly fibres. Frond flat, ribless, fan- 

 shaped, entire or variously cleft, marked with concentric lines ; the 

 cells of the surface radiating. Fructification, roundish or irregular, 

 scattered sori, bursting through the cuticle of both surfaces of the 

 frond, consisting, at maturity, of numerous spores, nestling among 

 jointed threads. Zonaria {Ag.), — from faw/, a girdle or zone ; be- 

 cause the frond is usually transversely banded. 



Zokaki a parvula ; frond procumbent, attached by fibres issuing from its 

 lower surface, membranaceous, suborbicular, variously lobed ; lobes 

 free, rounded, scarcely marked with concentric lines. 



Zonaria parvula, Grev. Crypt. Ft. t. 360. J. Ag.Sp.Alg. vol. i. p. 107. 

 Harv. Man. ed. 2. p. 38. 



Padina parvula, Grev. Alg. Brit. p. 63. Hook. Br. Ft. vol. ii. p. 282. Harv. 

 Man. ed. 1. p. 31. 



Padina reptans, Crouau. 



Padinella parvula, Aresch. Pug. vol. ii. p. 260. t. ix. f. 1-3. 



Aglaiozonia parvula, Zanard. Sag. p. 38. Kiitz. Sp. Alg. p. 566. 



Aglaiozonia reptans, Kiitz. I. c. 



Hab. On stones and nullipores near low-water mark, and especially on 

 nullipore banks in 4-15 fathoms water. Perennial? Summer. Dis- 

 covered by Miss Cutler, on sandstone tidal rocks near Sidmouth. 

 Miltown Malbay, near low- water . mark ; and Roundstone, on the 

 nullipore bank, W. II. II. Bute, Rev. D. Landslorovgh. Probably 

 all round the coast, in deep water. 



Geogr. Distr. British and French Atlantic coasts. Baltic Sea. Adriatic. 



Descr. Boot? Fronds procumbent, spreading over the rocks or surface of the 

 nullipore in circular patches, like a lichen, closely attached by means of 

 numerous fibrils or rootlets which issue from all parts of the Lower 4 surface ; 

 when young roundish, and slightly lobed, the lobes rounded ; as the plant 

 advances the lobes become elongate, somewhat linear, from a quarter to 

 half an inch in width, simple or subdichotomously divided, with rounded 

 axils; apices always rounded, and broader than the inferior portion of the 

 lobe, thus affecting a fan-shaped form. Margin somewhat wavy, free from 

 the rock. Substance membranaceous, brittle, and not adhering to p'aper. 

 Surface reticulated with small cells, which are arranged in Blightl) radiating 

 longitudinal lines, the cells at the base of the lobe being small and close- 



VOL. III. ■' n 



