V. SPH^ROCOCCOIDE.'E. Ill 



9. Gracilaria caudata, J. Ag. ; " frond terete, thick, carnoso-corneous, elon- 

 gated and laterally ramulose ; branches below dicliotomo-ramulose, above prolono-ed, 

 nearly naked, segments acuminate ; conceptacles hemispherical, scattered over the 

 whole frond." J. Ag. Sp. Alg. 2, ;j. 598. 



Hab. Gulf of Mexico, J. Agardh. 



Unknown to me. 



10. Gracilaria? Blodgettii ; frond cartilagineo-membranous, irregularly dichoto- 

 mous or alternately decompound, filiform, the axils rounded ; branches and ramuli 

 very much attenuated at the base, acute ; fructification unknown. 



Hab. Key West, Dr. Blodgett. (v. s. in Herb. T.C.D.) 



Frond five or six inches long, as thick as sparrow's quill, cylindrical or subcom- 

 pressed, not much attenuated upwards, irregularly much branched, the branches 

 and their divisions either alternate or secund, here and there forked, but not 

 regularly dichotomous. All the branches and their minor divisions and the ramuli, 

 which are few and scattered, taper very much to the base and are attenuated to an 

 acute point ; the lesser ramuli are spindle-shaped. No fruit has been detected. A 

 cross section shows a lax medullary stratum, formed of a few very large, dis- 

 tended, thin-walled, irregularly polygonal cells, with some smaller but similar 

 external cells ; and a periphery of veiy minute, vertically subseriate, coloured 

 cellules. Substance rather rigid wlien dry. Colour faded in all the specimens yet seen. 



A curious plant of doubtful affinity. The ramuli taper to the base fully as 

 much as in a CJwndria, but there is no articulated polysiphonous axis. The 

 structure is not very difi^erent from that of other Gracilarice, and the habit is 

 sufficiently like. I have seen no specimens but those received from Dr. Blodgett, 

 to whom this species is inscribed. 



YHI. CORALLOPSIS. Grev. 



Frcmd subterete, succulent, articulato-constrictcd ; branches proliferous from the 

 constriction, composed of two strata of cells ; the inner of very large, oblong cells, 

 smaller toward the circumference ; the outer of minute, coloured cellules in a sul)- 

 simple row. Conceptacles on the primary branches, hemispherical, inflated with a 

 thick pericarp at length opening by a pore, containing on an elevated basal placenta 

 densely tufted, fastigiate spore-threads radiating to all sides ; spores obovate, formed 

 in the upper articulations. Tetrasporcs unknown. 



