Marine Algae.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 513 



Harv., Handb. N.Z. Flora, p. 673. Heterosiphonia Berhleyi, Falk, " Die 

 Rhodomelaceen," 1901. 



Auckland Islands ; Hooker, Hombron. (Magellan Straits, Falkland Islands, 

 Marion Island, Kerguelen Land, South Georgia.) 



Laurencia, Lamouroux, 1813. 

 Distribution. — Nearly all seas. 



Laurencia pinnatifida, Lamouroux. 



Laurencia finnatifida, Lam., Ess. sur Thalassophytes, p. 48, 1813 ; Hook, f. & 

 Harv., Fl. Antarct., vol. i, p. 184, 1847. 



Auckland Islands ; Hooker. (North Atlantic, North Pacific, South Africa, 

 Magellan Straits.) 



"to^ 



Laurencia perforata, f. tenuissima (?), Montague. 



Laurencia perforata, Mont., Fl. Can., p. 155 ; J. Ag., Spec. Alg., vol. ii, pt. iii, 

 p. 748, 1852. 



* Antipodes Island ; Dr. Cockayne. (Identified by Major Reinbold.) 



A doubtful species, of which Major Reinbold writes, " Laurencia f resembles in 

 habit and ramification L. perforata, Mont, (syn., L. vaga, decumhens, radicans, Kg. 

 Tab. Phyc, xv, tab. 49-51). I should regard it [as] a very thin form of this species 

 (200-100 fl thick), L. perforata, f. tenuissimia (if not a new species ??)." 



Agardh's description of L. perforata {loc. cit.) is as follows : Genus Laurencia, 

 section 3 — " Fronde tereti subvage ramosa ; sterile caespites depressos intricatos- 

 pannosos formante, fertile pinnato-ramosa, ramis suboppositis. L. perforata pur- 

 purea, fronde tereti filiformi quoquoversum et vage intricato-ramosa, ramis recurvis 

 radicantibus sursum ranulos seriatos secundos emittentibus, ramulis clavates, fruc- 

 tiferis." 



Laurencia caespitosa, Lamouroux, is also reported by Hooker from Auckland 

 Islands, but has not been recently collected, and its occurrence there may be con- 

 sidered doubtful, as it seems to be confined to the warmer waters of the Atlantic. 



PoLYSiPHONiA, Greville. 

 Distribution. — All seas. 



Polysiphonia decipiens, MontagnBo 



Polysiphonia decipiens, Mont., Voy. au Pole sud, Bot., i, p. 131, 1845 ; Hook. 

 f. & Harv., Fl. Antarct., vol. i, p. 184, 1847. 



Auckland Islands ; Hombron, Hooker. (New Zealand.) 



This is a little-known species. The plant described by Agardh as P. decipiens 

 is P. aterrima. Hook. f. & Harv. {vide under P. aterrima Falkenberg, " Die Rhodo- 

 melaceen," p. 126). 

 34— S. 



