190 ALGJE RHODOSPERMEjE. [Furccllaria. 



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 ; 

 ■7ro\v, many, and icca, 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. rotundas, Grev. Cylindrical Polyides. Grev. Alg. 

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

 cus rqtundus, E. Bot. t. 1738. 



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

 times dichotomous ; the axils obtuse. 



Tribe XI. FURCELLARIEiE. 



Marine plants, of a dxdl 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 order 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. Fastigiaie Furcellaria. Grev. 

 Alg. £.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 1 , 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- 



