508 StJBANTARCTiC ISLANDS OP NEW ZEALAND. [Marine Algae. 



Rhodoglossum, J. Agardh, 1876. 

 Distribution. — Australasia, Kerguelen Land, California, and south-west America. 



Rhodoglossum latissimum (Harvey), J. Agardh (?). 



Halymenia latissima, Hook. f. & Harv., Fl. Antarct., vol. i, p. 189, 1847. 

 Rhodoglossum latissimum, J. Ag., Epicr. Florid., p. 187, 1876 (?). 



Enderby Island ; J. C. S. ! Hooker. Campbell Island ; Hooker. 



In Engler and Prantl's " Pflanzenfamilien," this genus is submerged in Iridaea ; 

 but, as Setchell and Gardner(i) point out, it is sufficiently distinct in the structure 

 and position of the sorus to be kept apart. Unfortunately, it is doubtful whether 

 the plant now known from New Zealand and California as R. latissimum, J. Ag., is 

 that originally described by Harvey as Halymenia latissima. Amongst the plants 

 collected by Mr. J. Crosby Smith at Enderby Island are two specimens which seem 

 to me to agree well with Harvey's original description and with the figure given in 

 the " Flora Antarctica," tab. 73, fig. i ; but this plant, though a Rhodoglossum, 

 must, I think, be regarded as distinct from Rhodoglossum latissimum, J. Ag. In 

 R. latissimum, J. Ag., of the mainland the sori are minute, almost punctiform 

 (" Sorisque sphaerosporarum punctiformibus per totam fere superficiem sparis": 

 J. Ag., Epicr., loc. cit.). In the Auckland Island specimen the sori, though superficial, 

 and containing the cruciate tetraspores of the genus, are elliptical in outline, from 

 2 mm. to 3 mm. in length, and sometimes become confluent. The tetraspores them- 

 selves are long and narrow. The plant also in its length (50-60 cm.), cuneate base, 

 and lanceolate segments, agrees better with Harvey's Halymenia latissima than with 

 the R. latissima of J. Ag., in which the segments are generally shorter and broader, 

 and often ovate in outline. It is quite possible that it may be found on a com- 

 parison of the New Zealand and Californian forms with that of the southern islands 

 that R. latissima, J. Ag., is distinct from H. latissima, Harvey, in which case, of 

 course, a new specific name will have to be found for the former. 



Rhodophyllis, Kiitzing, 1846. 

 Distribution. — Most temperate seas. 



Rhodophyllis bifida (Turn.), Kiitzing. 



Fucus bifidus. Turn., Hist. Fuc, iii, p. 45, 1811. Rhodophyllis bifida, Kiitz., 

 Spec. Alg., p. 786, 1849; Hook. f. & Harv., Handb. N.Z, Flora, p. 693, 1864. 



Lord Auckland Group ; d'Urville. (North Atlantic and Mediterranean.) 

 It may be doubted whether this northern species has been found in the southern 

 islands. It was reported by d'Urville, but has not since been collected, and is not, 

 I believe, definitely known from New Zealand or from the southern seas. 



Rhodophyllis acanthocarpa (Harv.), J. Ag. 



Callophyllis acanthocarpa, Harv., Fl. Nov. Zel., ii, p. 251, 1855 ; J. Ag., Epicr. 

 Florid., p. 364, 1876. 



* Auckland Islands ; R. M. L. (New Zealand.) (Identified by A. Gepp.) 



(1) " Algae of North-western America," p. 300, 1902. 



