Myxonema 207 



12. Myxonema stagnatile sp. nov. 



Floccose, floating ; filaments somewhat elongated, bearing at 

 widely separated intervals, solitary or opposite branchlets, which 

 are short, thorn-like, often curved, tapering to a sharp point or 

 attenuate into a long seta ; cells 8-1 1 fx in diameter, 1-3 times as 

 long (occasionally one or two cells above the point of branching, 

 each a length of 6 times the diameter) ; branchlets 7-9 ft in di- 

 ameter at the base {pi. j6,f. 1, 2). 



Floating in confervoid masses in pools and ponds. 



Massachusetts : Melrose, April, 1901 (553), May, 1902 (676). 



New York : Williamsbridge, April (292). 



This form resembles Stigeoclonium protensum as represented 

 by Thuret and some others, but most authors describe that species 

 as larger and having long drawn out branches, a characterization 

 which corresponds more closely to Dillwyn's species. 



13. Myxonema subsecundum (Kiitz.) 



Conferva subsecunda Kiitz. Alg. Dec. 14.6. 1836. 



Stigeoclonium sudsecundum "Kutz. Phyc. Gen. 253. 1843 ; Spec. 

 Alg. 352. 1849; Tab - ph y c - 3 : P l > T -f- 2 - l8 53- Rabenh. Flor. 

 Eur. Alg. 3: 376. 1868. Wolle, F. W. Alg. 112. //. pp. 

 f. 2. 1887. (?) * 



Filaments elongated, about 16 ft (12-18//) in diameter; very 

 sparsely branched below, branches never opposite ; cells cylin- 

 drical, very slightly constricted at the dissepiments, 3-10 times 

 as long as the diameter ; some branches elongated with cells of the 

 same character as those of the main filament, others shorter with 

 cells 2-3 times the diameter ; branches attenuated toward the apex 



0* 36 f. 3). 



Pleasantville, New Jersey, May 15, 1891 (F. S. Collins). 

 " Collected by H. W. Ravenel in rice field ditches, South Caro- 

 lina." F. Wolle. 



Doubtful Forms 



Stigeoclonium nudiusculum Kiitz. Tab. Phyc. 3 : 4. pi. 15. 

 f. 2. pi. 16. f. 1. 1853. Rabenh. Flor. Eur. Alg. 3 : 380. 1868. 

 Wolle, F. W. Alg. 113. pi. 98. f. /, 2. 1887. 



Dxaparnaldia nudinscula Kiitz. Phyc. Germ. 231. 1845. 



