520 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Marine Algae. 



Ballia, Harvey, 1843. 



Distribution. — All subantarctic seas. 



Ballia callitricha (C. Ag.), Kiitz. 



Sphacelaria callitricha, C. Ag., Syst. Alg., p. 166, 1824. Ballia Brunonia, Harv. 

 in Hook. Journ. of Bot., ii, p. 191, 1843. B. Hombroniana, Mont., Voy. au 

 Pole sud, Bot., i, p. 94, 1845, B. Brunonia, Hook. f. & Harv., Fl. Antarct., 

 vol. i, pp. 78, 182, 1847. B. callitricha, Kiitz., Sp. Alg., p. 663, 1849 ; 

 Hook. f. & Harv., Handb. N.Z, Flora, p. 710, 1864. 



* The Snares ; J. C. S. ! Auckland Islands ; Hooker and Harvey, J. C. S. ! 

 Campbell Islands ; Hooker. (Australia, Tasmania, New Zealand, Cape Horn, Falk- 

 land Islands, Kerguelen Land.) 



Ceramium, Eoth. 

 Distribution. — Abundant in all seas. 



Ceramium rubrum, C. Ag. 



Ceramium rubrum, C. Ag., Spec. Alg., ii, p. 146, 1820-27 ; Hook. f. & Harv., 

 Fl. Nov. Zel, ii, p. 256, 1855. 



Auckland Islands ; Hooker, J. C. S. ! Campbell Island ; Hooker, R. M. L. 

 (Common in all temperate seas.) 



Ceramium diaphanum, Lightfoot. 



Ceramium diaphanum, Ligbtfoot, Scot., p. 996 ; Hook. f. & Harv., Fl. Nov. Zel., 

 ii, p. 256, 1855 ; J. Ag., Epicr. Florid., p. 98, 1876. 



So many ill-defined species have been included under this caption that it may 

 well be doubted whether amongst the diaphanous forms occurring on the New Zealand 

 coast we have any which belong to C. diaphanum in the stricter sense. The distribu- 

 tion given below can only be regarded as true of C. diaphanum, as understood in a 

 wide sense. 



Auckland Islands ; Hooker. (Atlantic Ocean, Cape of Good Hope, New Zea- 

 land, Australia.) 



Ceramium aucklandicum, Kiitzing. 



Ceramium aucklandicum, Kiitz., Sp. Alg., p. 686, 1849 ; J. Ag., Anal. Algol., 

 cont. ii, p. 36, 1894. 



Auckland Islands ; Hooker, J. C. S. ! 



" Ceramium poUicare vage et crebre dichotomum ramulis superioribus gra- 

 cilibus forcipatis, forcipibus apertis ; articulis diametro aequalibus. Tetrocharpia 

 in ramis mediis numerosa nodiformia, semi-erumpentia." (Kiitz., loc. cit.) 



Amongst the specimens of Ceramium collected by Mr. Crosby Smith at Enderby 

 Island is a fragment of a plant which agrees well with Agardh's description of 

 Ceramium aucklandicum {loc. cit.). The specimen bears cystocarps. I have not seen 

 the tetraspores. The cystocarps generally replace one of the terminal segments, 

 are often in pairs, and are enclosed by one to four involucral branchlets, or by none. 

 The joint-cells are from two-thirds as long as broad to as long as broad. 



