Plate L. 



Fig. 224. PEYSSONELIA DUBYL 



Colour. Brownish-red. 

 Substance. Membranaceous. 



Character of Frond. A thin, incrusting expansion, at first simple and circular; after- 

 wards cut into divisions {lobes); attached to whatever it grows upon by 

 the whole of its under surface, which throws out woolly rootlets. Upper 

 surface marked by rings of hues (concentric zones). 



Measurement. From 1 to 2 inches across. 



Fructification. Only one kind known. Tetraspores hidden among radiating threads 



in wart-like prominences. 

 Habitat. North of Ireland and west of Scotland. Probably in many places. On 



old shells, stones, &c., on scallop-banks in from ten to fifteen feet water. 



Not uncommon. 



Fig. 225. GIGAKTINA ACICULARIS. 



Colour. A dull purple-red; darker when dry. 

 Substance. Oristly. 



Character of Frond. Cylindrical; wiry; irregularly branched; tufted; of much the 

 same thickness throughout, all but the tips, which are remarkably pointed. 

 Stems curved or wavy; simple or forked. Branches curved and re-curved; 

 wavy; wide-spreading in all directions; once or twice re-branched. Branch- 

 lets short, distant; either alternate, opposite, or forked; oftenest secund. 

 Eoot fibrous. 



Measurement. From 2 to 4 inches long. 



Fructification. Only one kind observed. Clusters of spores in globose capsules; 



sessile on the branchlets; often several together. 

 Habitat. South coast of England. Jersey. Belfast. On rocks near low-water 



mark. Eare. 



For other Gigartinas refer back to Plate XLIY. Fig. 201 ; Plate XLIII. Fig. 

 197; and Plate XLII. Fig. 194. 



Fig. 226. GINANNIA FURCELLATA. 



Colour. Sometimes a pale pinky, sometimes a dull red, becoming deeper in drying. 

 Substance. Membranaceous; fleshy; tender. 



Character of Frond. Cylindrical; the thickness of a goose-quill throughout; re- 

 peatedly and regularly forked (dichotomous) from a very short taper stem; 

 forming a circle when spread. Occasional specimens, midribbed; or some- 

 times constricted here and there as if jointed. Tips obtuse; broken ones 

 sometimes throwing out fresh frondlets. (See figure.) Eoot a disc. 



Measurement. From 2 to 6 inches long. Diameter of branches varying greatly 

 up to half an inch. 



Fructification. Only one kind known. Globular masses of spores, immersed in the 



frond. Showing through, when held up to the light. 

 Habitat. Eastern and southern shores of England. Ireland, all round; and very 



fine; Scilly. On rocks, &c. from low-water mark to eight or ten fathoms' 



depth. Eare. 



Now Scinaia furcellata. 

 25 * E 



