518 SUBANTARCTIC ISLANDS OT NEW ZEALAND. [Marine Algae. 



They are densely tufted, 1-2 cm. high, and much branched. In dried specimens 

 the thallus is dull brown in colour. The pinnae are themselves irregularly pinnately 

 and occasionally dichotomously branched. In the Stewart Island specimens, from 

 towards the upper ends of each cell of the pinnae spring two ultimate distichous 

 pinnules of limited growth. In the Snares specimens the ultimate pinnules are less 

 regularly arranged. Perhaps the most common and characteristic arrangement is 

 for them to be in alternate pairs. Two joint-cells in succession give rise to a pinnule 

 on the same side ; then the two cells above them give rise to a pair of pinnules on 

 the opposite side. This arrangement, however, is by no means the only one, though 

 perhaps the most common. Occasionally joint-cells may be found without pinnules ; 

 and at other times three pinnules will spring out in succession from one side of the 

 pinna ; or sometimes a cell will give rise to a pair of pinnae, as in the Stewart Island 

 specimens. I have seen as many as four pinnules in succession on one side without 

 corresponding ones on the other side. 



The tetraspores are the same as those of the Stewart Island specimens, and 

 similarly placed. 



Pleonosporium, Naegeli, 1861. 

 Distribution. — Northern and southern extra -tropical seas. 



Pleonosporium hirtum (Hook. f. & Harv.), R. M. L. 



Callithamnion hirtum (partim), Hook. f. & Harv., Fl. Antarct., vol. i, p. 192, 

 tab. 78, fig. 2, 1847. Pleonosporium hirtum, Laing, " New Zealand Species 

 of Ceramiaceae," Trans. N.Z. Inst., vol. xxxvii, p. 393, 1905. 



Auckland Islands ; Hooker. (New Zealand.) 



If, as I think probable, Harvey confused several species under the name 

 C. hirtum, it may be doubted which of these is represented by the plant collected 

 by Hooker at the Auckland Islands. As, however, in New Zealand at least, P. 

 hirtum is much more common than the others {Spongoclonium sp.), the Auckland 

 Island plant is perhaps this species. Indeed, the figure in the " Flora Antarctica " 

 almost certainly represents P. hirtum, or the very closely allied P. Brounianum, 

 rather than a Spongoclonium. 



Euptilota, Kiitzing, 1847. 

 Distribution. — South temperate and subantarctic seas. 



Euptilota formosissima (Mont.), Kiitz. 



Ptilota formosissima, Mont., Voy. au Pole sud, Bot., i, p. 98, tab. 9, fig. 3, 1845 ; 

 Hook. f. & Harv., Fl. Antarct., vol. i, p. 190, tab. 77, 1847. Euptilota 

 formosissima, Kiitz, Sp. Alg., p. 671, 1849. Ptilota formosissima, Hook, 

 f. & Harv., Handb. N.Z. Flora, p. 708, 1864. 



* The Snares ; R. M. L. Auckland Islands ; d'Urville, Hooker, J. C. S. ! 

 R. M. L. (New Zealand.) 



