496 YALONIACEAE. 



Terminating the stipe or each of its branches is a plane elliptic or ovate net- 

 work of opposite or substellate cohering branches and branchlets. The plant 

 is easily distinguished from Anadyomene by its long slender stalk and by the 

 less solid or more lacunose network. In this Struvea the vacant spaces among 

 the united branchlets occupy an area that is in the aggregate fully equal to 

 that occupied by the branchlets themselves, while in Anadyomene the mem- 

 brane is very nearly solid and continuous. 



Boodlea struveoides M. A. Howe, sp. nov. Thallus weakly stipitate, the 

 stipe simple or dichotomous, 5-30 mm. (1-4 cells) long, 200-450 At in diameter, 

 its cells 4-40 times as long as broad; branches variously disposed, often 

 mostly opposite and developing in a single plane, their branchlets cohering 

 frequently by tentacula and forming a flat uniaxial frond often 1 cm. long 

 and wide (4-16 meshes wide), these fronds, in turn, cohering with others of 

 their kind and forming dense spongy confervoid cushions 2-4 cm. in diameter; 

 or, branches subpalmate, palmately subdistichous, subverticillate, or emerging 

 irregularly and in all directions; cells of the main axes 150-320 /t in diameter, 

 mostly 2-5 times as long as broad, becoming scarcely longer than broad above; 

 branches and branchlets numerous, patent or divaricate, the ultimate cells GO- 

 SO /i in diameter, 2-4 times as long as broad, often recurved. 



On rocks in about 3 dm. of water, Harrington Sound (type, Howe 131, 

 in herb. N. Y. Bot. Gard.). 



This species is somewhat intermediate between Boodlea siamensis Reinb. 

 and Struvea anastomosans (Harv.) Piccone, but can not be accurately identi- 

 fied with either. Its nearest relatives are doubtless the East Indian B. 

 siamensis Eeinb. and B. paradoxa Eeinb., from both of which it apparently 

 differs in the development of a weak stipe (sometimes as much as 3 cm. long) 

 and in the commonly more Struvea-like development of its upper parts. It is 

 also more rigid and somewhat coarser in all its parts than B. siamensis, a type 

 duplicate of which has been compared with it. The frequent irregular develop- 

 ment of the branches in all planes makes the plant a Boodlea rather than a 

 Struvea. Of the Bermudian algae, this plant is perhaps most likely to be 

 confused with small pulvinate Cladophoras or with Cladophoropsis mem- 

 hranacea, but examination with a hand-lens or attempts to disentangle the 

 mats disclose the cohesions of the branchlets and the net-like meshes of the 

 Boodlea. Apparently endemic. 



Family CLADOPHORACEAE. 



Cladophoropsis membranacea (Ag.) Bjzirg. occurs on rocks near the low- 

 water mark, on roots of mangroves, and in pools, forming bright green attached 

 cushions or loose irregular detached clumps. In structure it resembles a 

 Cladopliora, but the branches are, usually at least, without a septum at the 

 base. (Phyc. Bor.-Am. 1866.) 



Cladophora fuliginosa Kiitz. Somewhat similar to Cladophoropsis mem- 

 hranacea and possibly a derivative of it, is the composite organism described 

 and figured by Harvey as Blodgettia confervoides, which occurs in Bermuda 

 in similar places, though often in more agitated water. This turns blackish 

 on being killed and is often blackish when found growing. There is present 



