Ser. GONGYLOSPEKMEJ:. ( 15 ) Fam. rhodymeniace^. 



Plate LXXI. 

 RHODOPHYLLIS BIFIDA.— Kiitz. 



Gen. Chak. — Frond flat, membranaceous, cellular, without veins or midrib, much 

 divided. Fructiiication of two kinds, on distinct plants : 1. Convex tubercles 

 (coccidia). Laving a thick cellular pericarp, and inclosing a spherical mass of 

 minute roundish or ovate spores, fixed by central placenta ; 2. Tetraspores, zonate, 

 roundish ovate, forming cloud-like sori in the upper segments. Name from poSou, 

 "a rose" perhaps, and cpvWov, "a leaf," from the rosy colour of the leaves or 

 fronds. 



Rhodophyllis bifida. — Frond delicate, membranous, flattened even 

 from the base, dichotomously divided into many linear or obcuneate 

 segments, their apices obtuse ; tubercles almost spherical, sessile. 



Rhodophyllis bifida. — Kiitz. Bot. Zeit. 1847, p. 23; /. G. Agardh, Sp. Gen. Alg. 

 vol. ii. p. 388. 



Rhodymenia bifida. — Grev. Alg. Brit. p. 85 ; Ilooh. Br. Fl. vol. ii, p. 289 ; 

 Wyatt. Alg. Damn. No. 66 ; Endl. 3rd Suppl. p. 51 ; Harv. in Maclc. 

 Fl. Eib. pai-t 3, p. 194 ; Harv. P. B. plate 32 ; Earv. Man. p. 124 ; 

 Harv. Syn. p. 103 ; Atlas, plate 40, fig. 183. 



Delesseria bifida. — Lamour. Ess. p. 37. 



Sph.s;rococcus bifidus. — Ag. Sp. Alg, vol. i. p. 299 ; Syst. p, 231 ; Kiitz. Phyc. 

 Gen. p. 410. 



Focus bifidus. — Goodw. tfc Woodw.Linn. Trans, vol. iii. p. 159, t. 17, f. 1 ; Sm. E. 

 Bot. t. 773 ; Turn. Syn. p. 165 ; Turn. Hist. t. 154. 



Var. /3. ciliata. — Frond opaque, dull red, narrow and much divided ; 

 margins fringed with leafy cilia. 



Rhodymenia bifida, )8 ciliata. — Harv. P. B. plate 32, fig. 3 ; Harv. Man. p. 124. 



Var. y. incrassafa. — Frond brownish red, broad ; segments cuneate, ciliata 



at the margin. 



Rhodymenia bifida, y incrassata. — Harv. P. B. descp. plate 32. 



Hab. — On rocks in the sea and on Algae. Annual. Summer. Not uncommon on the 

 southern shores of England and south and west of Ireland. Rare in Scotland. Ardrossan ; 

 Saltcoats ; Kilbride {Mev. Dr. Landsborough). 



Geogr. Dist.— Atlantic shores of Europe ; Mediterranean Sea. 



Description. — Root, a flattened disc, "accompanied by fibres." Fronds 

 tufted, stem scarcely any, flat, immediately expanding into a roundish 

 much-divided frond ; segments erecto-patent or divaricate, one to three 



