MARINE ALGM OF THE ' SEALAEK ' EXPEDITIOjS". 119 



Gloioderma, J. Ap^ardh. 

 1. Gloioderma (?) expansa, n. sp, (Plate 14. figs. 28, 29.) 



Thallo membranaceo, piano, verisimiliter horizontaliter expanse, margine prolifera- 

 tionibus in thallos juveniles excrescentibns. Thallo saepe anastomosante, constante 

 e strato iinico cellularum maximarum centralium, utroque latere duobus stratis 

 eellularum parvarum et uno strata cellularum mimmarum periphericarum cincto. 

 Cystocarpiis et antheridiis ignotis ; tetrasporangiis in strato corticali parum mutato 

 dispersis, cruciatis divisis. 



Saya de Malha, 53-55 fms. ; dry specimens. 



■ 



This alga seems to be new to science, and I have referred it to tlie family of the 

 Khodymeniaceae on account of its large central cells placed in one scries only. Its 



outward appearance recalls Bhodophyllis peltata^ Grun., of the Tonga Archipelago, but 

 it differs from that alga in liaving only one series of large central cells, whilst all species 

 of Hhodophyllis have two series. Amongst the PJiodymeniacea? it belongs, I think, to 

 tbe genus Gloioderma, because it has very small peripheral cells and cruciate 

 tetrasporangia scattered in the cortical layer, which is, nevertheless, very little 

 changed. 



Unfortunately I have seen neither procarps, cystocarps, nor antlieridia, and therefore 

 the generic position of the alga remains uncertain. It needs to be further investigated, 

 for it was gathered at a great depth (53-55 fms.), from which few Khodophycese are 

 known. 



By its broad, membranous, unbranched frond, which bears excrescences along its 

 margin, and sometimes, though rarely, on the frond itself, this alga is easily distinguished 

 from all other species of Gloioderma, as these have mostly a dichotomous or pinnate 

 ramification. The entirely diff'erent mode of growth of the alga from Saya de Malha, 

 and the great depth at which it was gathered, almost suggest that it may be the type of 



a new genus. 



Champia, Desvaux. 



1. Champia compiiessa, Harv. 



Harvey, Genera South African Plants, ed. 1, p. 402. 

 De Tuni, Syll. Alg. vol. iv. sect. ii. p. 561. 



Amirante, 20-25 fms. ; srriall fragment, in alcohol. 



Coetivy, reef ; dry s^iecimen. 



Distribution. Cape of Good Hope ; Ceylon ; Malay Archipelago ; Friendly Islands ; 



Australia (?) ; New Caledonia. 



2. Champia spec. 



Seychelles, Long Island, reef ; dry specimen. 



A small specimen intermingled with Gelldiopsis variabilis. The simple main axis 

 bears a few short branches, irregularly placed. Several main branches have grown 



