Laing. — On Neiv Zealand Species of Ceramiacese. 407 



Agardh's Callithamnion confusum. He states that lie has seen 

 " supra axillas quasi in gelatina effusa globos sphaericos plurimos 

 nidulantes in quibus forsam initia antheridiorum credere licet." 

 Is it possible that he here refers to the gland-cells ? 



8. Antithamnion ternif olium, R. M. L. ( = Callithamnion terni- 

 folium, Hook, and Harv., Lond. Journ., iv., p. 272 ; Flora 

 Antarct., p. 489, tab. 189, fig. 2). Plate XXXI., fig. 2. 



Thallus erect, forming dense tufts 2-4 cm. high, attached 

 in my specimens by holdfasts to Macrocystis, rather irregularly 

 dichotomously or pinnately branched, extremely slender and 

 flaccid, the lower branches distant but becoming crowded 

 towards the tip. Ramuli di- tri- or tetra-stichous, perhaps 

 most frequently in threes, often dichotomous, flagellate, acumi- 

 nate, consisting of 12-15 cells. Tetraspores cruciate, sparse, in 

 the axils of the branches. The cystocarps are solitary and sur- 

 rounded by a large number of involucral ramuli. The cells of 

 the main stem 05-075 mm. long and Ol-OlS mm. wide, about 

 five times as long as broad ; cells of ramuli about twice as long- 

 as broad, and becoming rapidly narrower towards the long 

 acuminate almost hair-like point. 



Distribution. — On Macrocystis 'pyrifera at Timaru, in dense 

 matted tufts (R. M. L.). 



This plant has hitherto only been known from the neighbour- 

 hood of Magellan Straits. I procured specimens of it at Timaru 

 and forwarded it to Major Reinbold, who identified it provision- 

 ally with Callithamnion ternif olium, Hook, and Harv., and this 

 identification must hold unless it can be shown definitely that 

 the plant is new. The specimens are much more luxuriant than 

 those of Hooker and Harvey. Their specimens, however, were 

 dredged, and seaweeds growing in deeper water are often dwarfed. 

 The original description is so brief as to be almost insufficient 

 for purposes of identification. The plate given in the " Flora 

 Antarctica " is also not altogether satisfactory, the tetraspores 

 being shown in one place as in tetrads, whilst another figure 

 suggests cruciate division. The cystocarps are stated to be 

 terminal on the branches in the " Flora Antarctica " (loc. cit.). 

 It is not very clear what is here meant by a branch. In accord- 

 ance with the generic character the cystocarps are perhaps 

 formed at the end of the ramulus, but they are not terminal on 

 the main stem and branches, and they become so surrounded 

 by the involucral ramuli when fully developed that it is not 

 easy to determine their original position. They are not two- 

 lobed, although two are often developed close to each other. I 

 have therefore had to rely upon the vegetative characters in 

 determining the species. This agrees well with those described 



