202 CHAETOPHORACEAE 
which appears to have escaped the notice of DeToni, but rather 
than crowd it unduly into that species, it seems better to establish 
a new species. 1 
Wolle’s figure of Stzgeoclonium nudiusculum shows consider- 
able similarity to our plant; it is certainly not what it purports 
to be. 
Myxonema ventricosum was abundant at the time noted, but 
when sought for, less than a month afterward, none could be 
found. The plant is so marked a form, however, that there can 
be no doubt of its distinctness. 
6. MvxoNEMA TENUE (Ag.) Rabenh. Deutsch. Krypt. Flor. 2°: 
100. 1847 
Draparnaldia tenuis Agardh, Alg. Dec. 40. 1814; Syst. Alg. 
57. 1824; Icon. Ale Eur. ۸ 38. 1828-35. Hass. Brit. F. ۰ 
Ale 123. pl. zz. f. 2. 1845. Derb. & Sol. Ann. Sci. Nat. Bot. 
III. 14: 267. pl. 33. f. 1-6. 1850. 
Stigeoclonium tenue Kitz. Phyc. Gener. 253. 1843; Phyc. 
German. 197. 1845; Spec. Ale 353. 1849; Tab. Phyc. 3: ۰ 
3. f. 7. 1853. Rabenh. Krypt. Flor. Sachs. 1: 268. 1863; 
Flor. Eur. Alg. 3: 377. 1868. Kirchn. Krypt. Flor. Schles. 2' : 
68. 1878; Mik. Pflanz. 11. A. 7. f. rg. 1891. Hansg. Prod. 
Alg. Bohm. 1: 66. 1886. Wolle, F. W. Alg. 111. ۸ 96. f. 1r. 
1887. Cooke, Brit. F. W. Ale 189. ai 73. f. 3. 1883. De- 
Toni, Syll. Alg. 1: 197. 1889. De Wild. Flor. Alg. Belg. 44. 
1896. 
Myxothrix tenuis Trevis. Alg. Ten. Udin. 16. 1844. 
Tufts 5-10 mm. long, bright green ; filaments much branched, 
slender; main branches solitary or opposite, usually not more 
than two pairs adjacent; branchlets numerous, scattered or op- 
posite, short, erect, thorn-like, tapering to an acute point or finely 
setiferous ; cells cylindrical or siightly swollen, 7-10 nm (generally 
8 رم‎ in diameter, 1—3 times as long (sometimes longer below); 
branchlets 5-6 & in diameter at the base, cells about as long as 
the diameter (ai 32). 
In brooks and watering-troughs. 
VERMONT: St. Johnsbury, August (643). 
MASSACHUSETTS: Melrose, May 16, 1901 (F. S. Collins, 
4007). 
