190 ALG^E RHODOSPERME.E. [Furcellaria. 



34. POLYIDES. Ag. Polyides. 



Frond cylindrical, dichotomous; root scutate. Fruct.: naked 

 spongy warts, composed of radiating filaments, among which 

 are imbedded clusters of wedge-shaped seeds. Grev. Name ; 

 woXt;, many, and idea, form or appearance ; not at all appli- 

 cable. It is to be regretted that Dr. Greville's excellent 

 name, Spongiocarpus, not having the claim of priority, can- 

 not be adopted. 

 1. P. rotundus, Grev. Cylindrical Polyides. Grev. Alg. 



t. 11. Hook. Br. Fl. v. ii.p. 284. P. lumbricalis. Ag. Fu- 



cus rotundus, E. Eot. t. 1738. 



Sea coasts, not rare. Fronds 4 6 inches high, dark purple, several 

 times dichotomous j the axils obtuse. 



TRIBE XI. FURCELLARIEjE. 



Marine plants, of a dull dark purplish colour, of a carnose 

 substance and cellular structure. Frond cylindrical, dichoto- 

 mous ; the central part closely cellular ; the circumference com- 

 posed of radiating simple filaments. Root creeping. Fructifi- 

 cation : terminal pod-like indehiscent receptacles, within which is 

 imbedded, beneath the outer coat, a stratum of dark red-brown 

 seeds. Very similar to the preceding family in habit, but de- 

 cidedly differing in structure and in the fructification. 



35. FURCELLARIA. Lamour. Furcellaria. 



Frond cartilaginous, cylindrical, dichotomous. Root creeping. 

 Fruct. : terminal, elongated, pod-like receptacles, containing 

 a stratum of dark, oblong, pear-shaped seeds in the circum- 

 ference. Grev. Name ; furcula or furcilla, a little fork ; 

 from the forked frond. 



1. F. fastigiata, Lamour. Fastigiate Furcellaria. Grev. 

 Alg. t. 11. Hook. Br. Fl. v. ii. p. 283 Fucus lumbricalis. 

 Turn. Hist. t. 6. E. Bot. t. 894. 



Rocky shores, common. Frond 6 8 inches long-, purplish-brown, 

 dichotomous ; axils acute. 



TRIBE XII. FLORIDE^E. 



Plants marine, of a purplish-red or fine rose colour, of a 

 coriaceous, cartilaginous or membranaceous substance and eel- 



