Ser. ChlorospermejE. Fam. Valoniacea. 



Plate VII. 



STRUVEA MACROPHYLLA, m 



arv. 



Gen. Char. Frond stipitate, flabelliform. Stipes rooting, unicellular and 

 monosiphonous, transversely rugulose, thinly coated with calcareous 

 matter, at maturity crowned with an oblong, midribbed open network, 

 composed of anastomosing, pinnately decompound, articulated, confer- 

 void filaments. Endochrome bright-green, thin and watery. — Struvea 

 (Soud.), in honour of H. de Struve, Ambassador from Russia to the 

 Hanseatic Towns, and a patron of Natural History. 



Frons stipitata,flaielliformis. Stipes radlcatus, monosiphonius, continuus, annu- 

 latim coustr ictus et transversim rugulosus, epidermide tenui catcarea donatus, 

 in (state majore reticulo jtabelUfonni oblonyo costato coronatus. Reticulum 

 ex Jilis confervoideis articulates distiche pinnatis anastomosantdnis evolutum. 

 Succus aquosus, viridis. 



Struvea macrophjlla ; network (4 inches long) oblong-oval, crenate, its 

 filaments many times pinnately decompound; articulations of the 

 pinnae 5-6 times, of the pinnules 3-4 times, as long as broad. 



S. macrophylla ; fiabello oblougo-ovali maximo (4 uncias longo, 2f uncias lato) 

 crenato, Jilis anastomosantibus pluries pinnatis, articulis pinnarum 5-Q-plo 

 pinnularum 3-4<-plo diametro loiujioribus. 



Struvea macrophylla, Harv. in Trans. R. I. Acad. v. 22. p. 564. 



Hab. Champion Bay, Western Australia, Mrs. Drummond, Jan. 



Geogr. Distr. As above. 



Descr. Stipes 2^-3 inches long, about 2 lines in diameter in the middle, taper- 

 ing thence to the base and the apex, with a fibrous, branching root, uni- 

 cellular, closely rugulose, transversely or annularly constricted throughout, 

 and covered with a thin coating of carbonate of lime. Flabelliform network 

 about 4 four inches long and 21 inches wide, elliptic-oblong, crenato-lobu- 

 late at the margin, composed of an oppositely branched, decompound- 

 pinnate, confervoid filament, whose branches and ramuli anastomose, leaving 

 open spaces between. The primary pinnae are about i of an inch apart, 

 erecto-patent and slightly curved upwards, and are continued, without 

 branching, from the rachis (or midrib of the net) to the margin, where they 

 are connected together by a sort of arch, forming one of the crenatures; 

 these pinnae emit at every node a pair of opposite pinnules, which are again 

 at least twice divided (but less regularly), and all the apices of contiguous 

 ramuli anastomose, so as to form a lace-like network. The filaments of the 

 network are cylindrical, their articulations much longer than the diameter ; 

 those of the principal pinnae at least five to six times, those of the smaller 

 divisions four to five, and of the ultimate ones about two to three times as 

 long as their diameter. The substance is firmly membranous and tough. 



