v; CRYPTONEMIACEJi. igi 



5, Chrtsymenia ? (Cryptarachne ?) acanthoclada ; stem somewhat distended, 

 (laxly cellular with a dense fibro-cellular axis) divaricately much branched, irre- 

 gularly decompound ; branches distichous, slender, much attenuated, widely spread- 

 ing, zig-zag, alternately decompound, aculeate with short, sub-distichous, spine-like, 

 subulate, acute, divaricated ramuli. (Tab. XXV.) 



Hab. Thrown up from deep water. Key West, very rare, TF. H. H. (v. v.) 



Boot a spreading disc. Frond solitary (?) rising with a stipes half an inch, then 

 branching, either forked, trifurcate or laterally decompound, the main branches in- 

 crassated, two to three lines in diameter, simple or forked, set with numerous lateral 

 branches, which are much more slender, alternately-decompound, and very much 

 attenuated at the points, sometimes drawn out almost into setaceous cirrhi. All parts 

 of the frond are distichous and divaricate ; the secondary branches strikingly zig- 

 zag or bent alternately from side to side. Raimdl thorn-like, one to two lines lono-, 

 acute, patent. Colour, a deep lake-red when fresh, brownish when dry. Substance 

 between cartilaginous and gelatinous. It shrinks much and closely adheres to 

 paper in drying. Fruit unknown. 



The fruit of this remarkable plant being unknown, its genus is still doubtful, but 

 it seems to me to have many points in common with our Ch. ramosissima, and I do 

 not think it placed fixr from its affinities in the present genus. The perfectly dis- 

 tichous branching and gelatinous substance are worthy of attention in determining 

 its relationship. 



Plate XXV. Chrtsymenia ? acanthoclada ; the natural size. Fig. 2, transverse 

 section of a bi'anch ; viagnljied. 



Sect. 3. Botrtocladia, J. Ag. ; stem filiform, solid, branching, beset with inflated, 



pear-shaped ramidi. 



6. Chrysymenia uvaria, J. Ag. ; frond cylindrical, solid, dichotomous or irregu- 

 larly much branched ; branches filiform, beset with scattered or imbricated, inflated, 

 ohovate ramuli ; conccptacles depressed, hemisphei'oidal. -/. Ag. Sp. Alg. 2, p. 214. 

 Gastroclonium uvaria, Kiitz. Sp. Alg. p. 805. (Tab. XX. B.) 



Hab. Thrown up from deep water. Key West, common, W. H. H. (26), (v. v.) 



Fronds tufted, six to twelve inches long or more, the larger specimens as thick as 

 crow-quills, the smaller as thick as sparrow quills, cylindrical, solid, firmly carti- 

 laginous, rigid, irregularly much branched, the lower branches sub- dichotomous. 

 Sometimes the upper branches are bushy with a profusion of rod-like or tendril- 

 like lesser branches. The stems and larger branches of old specimens are generally 

 bare, or furnished with a few impei-fectly developed ramuli, but all the younger 

 branches, and the whole frond in young specimens, are thickly covered with quad- 

 rifarious, obovate, inflated, glossy ramuli. On these ramuli the depressed conceptacles 



