ser. melanospermej:. ( 77 ) fam. dictyotej:. 



ZONAKIA PAEVULA.— G^re^. 



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 ; 

 margin fringed. Fructification: roundish or irregular, scattered son, bursting 

 through the cuticle of both surfaces of the frond, consisting, at maturity, of 

 numerous spores nestling among jointed threads."— PA?/c. Brit. Name from 

 (oovri, " a zone." 



ZoNARiA parvula. — Fronds procumbent, creeping over the rock to 

 which it is attached by numerous radicles, membranaceous, variously 

 lobed ; lobes rounded, their apices free. 



Zoj^f ARIA parvula.— Grev. Crypt. Fl. t. 360; J. Ag. Sp. Alg. vol. i. p. 107; 

 Harv. P. B. plate 341 ; Harv. Man. p. 38 ; Harv. Syn. p. 32 ; 

 Atlas, plate 13, fig. 50 ; /. G. Agardh, Sp. Gen. Alg. vol. i. p. 107. 



Padina parvula.— Grev. Alg. Brit. p. 63 ; HooTc. Br. Fl. vol. ii. p. 282 ; Harv. 

 Man. 1st edit. p. 31. 



Padina reptans. — Crouan. 



Padinella parvula. — Aresch. Pug. vol. ii. p. 260, t. 9, f. 1 — 3. 



KGhAiozomA parvula. — Zanard, Sag. p. 38; Kiliz. Sp. Alg. p. 566. 



AoLAiozoNiA reptans. — Kiitz. 1. c. 



Hab. — On stones, old shells, and Nullipores from near low-water to fifteen or twenty 

 fathoms. Perennial. Summer. Not uncommon. Loch Strangford (Dr. DicJcie). 



Geogr. Dist. — British and French Atlantic coasts ; Baltic ; Adriatic. 



Description. — Fronds procumbent, closely appressed to the rock or 

 other substance on which it grows, in patches of several inches in extent, 

 the segments frequently imbricated, or overlapping in the manner of a 

 foliaceous lichen, the whole under surface adherent by means of its small 

 fibrous radicles, except the apical margins, which are free ; the margins 

 are more or less lobed, the lobes rounded, obtuse, retuse, or emarginate, 

 frequently sinuated ; the axils, when the lobes become elongate, wide 

 and rounded. Both surfaces are smooth, the under everywhere more or 

 less covered, except at the margin, with slender rootlets, simple or dicho- 

 tomously branched, and from one to three lines in length. Structure 

 cellular, cells quadrate, arranged in linear longitudinal series, rather 

 longer than broad, the basal ones smallest. Substance membranaceous, 

 firm, scarcely adhering to the paper. Colour, a brownish olive, brown 

 when dry. 



