Marine Algae.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 495 



Cladophora pacifica, Kiitzing. 



Conferva facifica, Mont,, Voy. au Pole sud., Bot., i, p. 7, 1845. Cladophora 

 'pacifica, Kiitz., Sp. Alg., p. 419, 1849. 



Auckland Islands ; d'Urville, R. M. L. (Kerguelen, Falklands.) (Identified by 

 A. Gepp.) 



The South African C. virgata, Kiitz., Sp. Alg., p. 388, is also recorded by d'Urville 

 from Auckland Islands, but has not since been collected. 



Rhizoclonium, Kiitzing, 1843. 

 Distribution. — All seas. 



Rhizoclonium Hookeri, Kiitzing. 



Rhizoclonium Hookeri, Kiitz., Sp. Alg., p. 383, 1849. R. ambiguum (?), Kiitz., 

 Sp. Alg., p. 387, 1849. Conferva ambigua (?), Harv., Lond. Journ., p. 295, 

 1845 ; Hook. f. & Harv., Fl. Antarct., vol. ii, p. 494, 1847. 



* The Snares ; J. C. S. * Enderby Island ; J. C. S. Monument Harbour, 

 * Campbell Island ; J. C. S. (New Zealand, Kerguelen Land, Tierra del Fuego.) 



This is the same plant as one that I collected at the mouth of the Kaikorai, 

 near Dunedin, some years ago, and forwarded to Major Reinbold for identification. 

 He returned it as Rhizoclonium Hookeri, Kg. (= R. africanum. Kg., = (?) R. am- 

 biguum. Hooker). Rhizoclonium ambiguum was collected by Sir James Ross's 

 expedition at Kerguelen Land, and is figured in the " Flora Antarctica," tab. cxci, 

 and scarcely seems to be different from the plant under discussion. A Rhizoclonium 

 from Tierra del Fuego has also been identified as R. ambiguum{^). Recently the 

 numerous and badly discriminated species of Rhizoclonium have been subjected to a 

 careful revision by S. Stockmayer(2). Mr. Stockmayer reduces the large number 

 of species described to five. R. Hookeri is retained, but not R. ambiguum. Un- 

 fortunately, I have not yet a copy of Stockmayer's paper, but presume that R. 

 ambiguum has become a synonym for R. Hookeri. 



The only other species yet recorded from New Zealand is Rhizoclonium hierogly- 

 phicum, Kiitz. f. waikitensis, F. Hauck., from the Waikato River. A few notes on 

 the form obtained during the " Hinemoa " trip may be useful. Rhizoclonium Hookeri, 

 Kiitz. : A small tufted filamentous alga, sending up long unbranched filaments 

 from a creeping rhizome, which gives ofi a few usually colourless unicellular rhizoids, 

 narrower than the filaments. Occasionally, however, a slight stream of endochrome 

 is seen passing into the rhizoids. The chromatophores in each cell become waisted 

 like an hour-glass before division. They are of a deep olive-green. Dissepiments 

 between the cells are only faintly visible in the glycerine-prepared specimens, and 

 not visible at all where the cells are young, or have only recently divided. In the 

 centre of the branches the cells are about one and a half to twice as long as broad. 

 (Plate XXIV, figs. 5, 6.) 



(^) " Mission scientifique dii Cap Horn, Alques," Hariot, p. 18, 1886. 



(^) " Ueber die Algengattung Rhizoclonium," S. Stockmayer. K. K. Zoologiscli-botanischen 

 Gesellschaft, Wien, 1890. 



