186 Ulothricaceae 



p. /. 36-40; pi. 10. f 55, j6. 1 88 1 ; Jahrb. vviss. Bot. 18: pi. //. 

 f 64.-68. 188;. DeToni, Syll. Alg. 1 : 216. 1889. 



Conferva minor Klebs, Fortpflanz. Alg. und Pilz. 347./*/. 2.f. 

 1-8. 1896. 



Cells generally cylindrical, sometimes very slightly swollen, 

 5-6 fj. in diameter, 2-4 or more rarely 6 times as long as broad ; 

 chromatophores 2-4 in each cell, arranged symmetrically in pairs 

 for the most part (pi. 25, f 7, 8). 



Massachusetts : Melrose, April (550A, 552B). 



Connecticut : New Preston, September (495 A). 



New York: Bronx Park, May (421), June (443C, 626B) ; 

 Staten Island, April (328). 



New Jersey : Undercliff, Bergen county, May (428), De- 

 cember (233). 



After a number of observations and cultures, the distinctness 

 of this species as defined by Klebs has been confirmed. It differs 

 markedly in the character of the chromatophores from any form 

 of Tribonema bombycinnm. 



3. Tribonema utriculosum (Kiitz.) 



Conferva utriculosaYJoXz. Alg. Dec. 114. 1836 ;* Spec. Alg. 



372. 1849; Tab. Phyc. 3: //. 44. f. 5. 1853. Roemer, Alg. 



Deutsch. pi. 5. /. 79. 1845. Wille, Ofvers. Vet. Akad. Forhand. 



1881 8 : 22. pi. 10. f 67. 1 88 1. VVolle, F. W. Alg. 140. pi. 120. 



f 14-16. 1887. DeToni, Syll. Alg. 1:217. 1889. 



C. ventricosa Kiitz. Phyc. Germ. 203. 1845. 



Filaments long and often irregularly inflated, but sometimes 

 cylindrical; cells 11-16.5// in diameter, 1)4-6 times as long ; 

 chromatophores large and often crowded : cell-wall thicker than 

 in the smaller species (_/>/. 25, f 9-1 1). 



Exsic. : Phyc. Bor. Am. 864. p. p. (sub Microspora floccosd) 

 Melrose, Mass., May 15, 1901 (F. S. Collins). 



In slow or rapid streams, frequently in the outlets of swamps. 



New York : Van Cortlandt Park, April (347), May (418). 



New Jersey: Hudson Heights, May (435C); Grantwood, 

 May (429, 573C, 579A). 



This species probably includes forms sometimes identified as 

 Conferva bombycina major ^ Wille. The original diagnosis of the lat- 



* Citation from Kiitz. Spec. Alg. 372. 



