512 SUBANTAECTIC ISLANDS OF NEW ZEALAND. [Marine Algae. 



Hypoglossum, 1843. 



Hypoglossum crassinervium (?) (Mont.), Kiitz. 



Delesseria crassinervia, Mont., Voy. au Pole sud, Bot., i, p. 164, tab. 8, fig. 1, 

 1845 ; Hook. f. & Harv., Fl. Antarct., vol. i, p. 184, 1847. Hypoglossum 

 crassinervium, Kiitz., Sp. Alg., p. 876, 1849. Delesseria crassinervia, Laing, 

 Trans. N.Z. Inst., vol. xxix, p. 447, 1896, and vol. xxxiv, p. 347, 1902. 



Campbell Island ; Hooker, J. C. S. ! Auckland Islands ; Hooker. New Zealand ; 

 R. M. L. (The plants from Fuegia and Kerguelen Land described under this name 

 are probably distinct species — vide J. Ag., Epicr. Florid., p. 486 : Delesseria fJiyllo- 

 fhora and note thereon.) 



A fragment of a plant very similar to the one described by me (Trans. N.Z. 

 Inst., vol. xxix, p. 447) was brought by Mr. J. Crosby Smith from Campbell Island. 

 It differs in certain points, which may be of varietal or even specific importance, 

 but, for the present at least, both plants may be considered as one species. The 

 costa is much broader than in the New Zealand form of the plant, being 4-5 mm. in 

 breadth, while in the local form it is only 2-3 mm. ; the wings of the pinnae are also 

 much better developed in the Campbell Island form, whilst its ultimate pinnules are 

 much shorter and less numerous than in the mainland variety. These may possibly 

 be differences due to the different ages of the plants and to varying local con- 

 ditions. My previous description {loc. cit.) of the sori is inaccurate, and I would 

 like to amend it now. The tetraspores are arranged in narrow bands along both 

 sides of the costae of the pinnae and pinnules in both the Campbell Island and New 

 Zealand forms. I am not at all satisfied that my plant is the same as Montague's 

 species, which will perhaps never be definitely re-identified, but, as I have already 

 described it under the specific name crassinervia, it will be well to retain this until 

 the various forms and stages have been more fully collected and more closely ex- 

 amined, and the genus redetermined. {Vide Plate XXI, figs. 1, 2.) 



ScHizoNEURA, J. Agardh, 1898. 

 Distribution. — Subantarctic Ocean. 



Schizoneura dichotoma. 



Delesseria dichotoma. Hook. f. & Harv., Fl. Antarct., vol. i, p. 184, tab. 71, 

 fig. 2, 1847 ; J. Ag., Epicr. Florid., p. 480, 1876. Schizoneura dichotoma, 

 J. Ag., Sp. Alg,, vol. iii, pt. iii, p. 168, 1898. 



Auckland and Campbell Islands ; Hooker. (Foveaux Strait, Kerguelen Land, 

 St. Paul Island.) 



Fam. EHODOMELACEAE. 

 Heterosiphonia, Montague, 1842. 

 Distribution. — Almost all seas. 



Heterosiphonia Berkley!, Montague. 



Heterosiphonia Berkleyi, Mont., Voy. au Pole sud, Bot., i, p. 137, tab. v, 

 fig. 1, 1845. Dasya Berlleyi, J. Ag., Sp. Alg., ii, p. 1179, 1852 ; Hook. f. & 



