KALLYMENIA. 149 



horizontal filaments radiate towards the membranous peri- 

 phery ; surface cellules hexagonal. Fructification : spherical 

 masses immersed in the frond, affixed to the inner coating of 

 the periphery, composed of radiating filaments, whose cells 

 are at length converted into spores. Name in honour of 

 Count G. Ginanni, author of an early work on the produc- 

 tions of the Adriatic. 



1. G. furcellata, Turn. ; frond tender, cylindrical, uni- 

 formly dichotornous, the segments obtuse. Grev. Alg. Brit, 

 p. 163; Hook. Br. Fl. ii. p. 308; Wyatt, Alg. Danm. No. 

 79 ; Harv. Phyc. Brit. t. Ixix. Ulva furcellata, E. Bot. t. 



1881. 



On rocks and stones in the sea, rare. Annual. Summer. On the East- 

 ern and Southern shores of England. All round the Irish coast, but no- 

 where common. Frond 2 6 inches long, cylindrical, from a line to 

 nearly half an inch in diameter, repeatedly and regularly dichotomous, of 

 a fine pinky red colour, and either firmly or laxly gelatinous substance. 

 Irish specimens are much larger than the English ones. Some are remark- 

 able for possessing a very distinct midrib. The branches (particularly in the 

 broader specimens) are frequently constricted, as if tied, when the frond 

 assumes a jointed appearance. In a specimen communicated by Mrs^ 

 Griffiths,t}ie apices are truncate as if broken off, with the margins thickened 

 into a disk or ring, from the centre of which spring one or two little 

 ramuli, showing an evident attempt at prolonging the frond after injury. 

 This species seems widely distributed ; I have gathered it at the Cape of 

 Good Hope, and possess specimens from New Zealand. 



XIII. KALLYMENIA. J. Ag. [Plate 19, B.] 



Frond blood-red, ribless, expanded, carnoso-membranace- 

 ous, formed internally of three strata ; the inner of interlacing 

 filaments ; the medial of large round cells ; the outer of mi- 

 nute cells, arranged in vertical strings. Fructification : 1, 

 spherical masses of spores (favellidia) semi-immersed in the 

 frond ; 2, triangularly parted, scattered tetraspores. Name 

 from xaXAoj beauty, and y/*w, a membrane. 



1. K. reniformis, Turn. ; stem short, cylindrical, simple 

 or branched, suddenly expanding into a roundish, sub-sim- 

 ple, or irregularly cleft (occasionally producing new fronds 

 at the margin), somewhat lobed frond ; favellidia and tetra- 

 spores scattered over the surface. Harv. Phyc. Brit. t. xiii. 

 Rhodomenia reniformis, Hook. Br. Fl. ii. p. 292 ; Wyatt, 

 Alg. Danm. No. 19. Irid<ea reniformis, Grev. Alg. Brit, 

 p. 160. Fucus reniformis, E. Bot. t. 2116. 



