172 



CRYPTOGAMIA. 



sponge-like. Branches erect, from one-quarter to half an inch high, 

 spongy, like the stem, densely clothed with whorled patent leaves, 

 which are so closely imbricated that their points alone are visible. 



A very remarkable species, with the external habit of a Godium, 

 but the structure of a Gaulerpa. We have great satisfaction in affix- 

 ing to it the name of Dr. Pickering, who collected many of the Algae 

 here described, and whose ethnological writings are so well-known 

 and appreciated. 



Valonia intricata, Ag. Tonga Islands. 



Dictyosph^eria favulosa, Becaisne. Wake Island. 



Codium tomentosum, Ag. Sandwich Islands. 



Microdictyon Agardianum, Becaisne. Wilson's and Vincennes 



Islands, Paumotu Group. 

 Cladophora composita, Haw. Sandwich Islands, Oahu. 

 Cladiphora herpestica, Mont. Tongatabu. 

 Ulva latissima, Linn. Oahu, Sandwich Islands. 

 Entermorpha compressa, ifrev. Tongatabu. 



CHLORODESMIS, Harv. & Bail. Nov. Gen. 

 Gen. Char. Stipes sjyongiosus, e fills tennissimis membranaceis dermis- 

 sime intertextls composltus, apice in fila libera penicillata desinens. 

 Fila penicillata membra nacea, contlnua, dicliotoma, libera, ad axillas 

 constricta, pseudo-art icidata ; articulis succo viridi repletis. 

 Chlorodesmis comosa, Harv. & Ball. (Tab. 8, fig. 8-10.) 



Hab. Feejee Islands. [Abundant on coral-reefs at the Friendly 

 Islands. W. H. EL] 



This curious plant has the habit of a Penicillus, but is not in the 

 least calcareous. The filaments of which it is composed are all deli- 

 cately membranaceous, like those of a Bryopsis. The stipe is a quarter 

 of an inch thick, formed of matted fibres half an inch long in the speci- 

 mens, and ending in a brush-like tuft, an inch or more in length, dense 

 and fastigiate. Filaments very slender, repeatedly dichotomous, con- 

 stricted at the axils ; the constriction impervious ? dividing the thread 

 into articulated portions, which are filled with green fluid-matter. No 

 carbonate of lime in any part. It closely adheres to paper in drying. 



