Ser. CnLOROsPERMEiE. Fam. Siphonacea. 



Plate XLI. 



CODIUM MAMILLOSUM, Raw. 



Gen. Char. Frond sponge-like, composed of a plexus of unicellular, 

 branching filaments, filled with green, semifluid endochrome. Fruc- 

 tification : lateral sporangia borne on the peripheric rainuli, and con- 

 taining innumerable zoospores. — Codium {Stackh.), from kcoSlov, the 

 skin of an animal. 



From spongiamorpha, e plexu filorum unicellidorum ramosorum conflata ; endo- 

 chromate Icetevirente, grumoso. Fruct., sporangia propria, lateralia, ex ra- 

 mtdis periphericis enata, zoosporas indefimtas foventia. 



Codium mamillosnm ; frond nearly spherical, solid, fixed by a point only ; 



interior filaments densely interwoven ; the peripheric ramuli very 



thick, inflato-cylindrical, their apices forming superficial prominences 



like mamillse ; when dry, glistening. 



C. mamillosum ; fronde globosa solida puncto affixa ; filis interioribus densis- 

 si?ne intertextis arachnoideis gelatina subsolida obcallatis ; periphericis maximis 

 infiato-cylindraceis, eorum apicibus mamillceformibus ad superjiciem frondis 

 directis, siccitate sericeo-nitentibus. 



CoDirM maniillosuni, Harv. in Trans. R. I. Acad. v. 22. p. 565 ; Alg. Amir. 

 Exsic. n. 578. 



Hab. Cast ashore from deep water. Fremantle, and King George's Sound, 

 W.H.H., G. Clifton. 



Geogr. Distr. Western Australia. 



Descr. Root a mere point of fixture. Frond spherical, egg-shaped or kidney- 

 shaped, very dense and solid. When cut across, the central portion is seen 

 to be formed of innumerable, very slender, branching, interwoven, thread- 

 like filaments, set in and surrounded by a rather firm but slimy jelly; and 

 the exterior portion, or peripheric stratum, of very thick, inflated, bright- 

 green, bag-like ramuli, which rise from the slender internal filaments, and 

 are continuous with them at the base. The centre of the frond therefore 

 may be regarded as composed of interwoven rootlets, of which the peripheric 

 ramuli are the true fronds, the sphere being a compound body formed of a 

 colony of unicellular Algae. The membrane is very tough and fine, and 

 when dry has a vitreous or satiny lustre. The endochrome is bright-green, 

 thickish, and fills the ramuli. No fruit has been observed. When dry the 

 frond does not adhere to paper. 



This curious plant is in all essential characters a Codium, but 



