Tribonema 185 



New York: Central Park, May (128) ; Van Cortlandt Park, 

 April (347); Bronx Park, June (605, 626C) ; New Rochelle, No- 

 vember (519). 



New Jersey: UnderclifT, April (526); Englewood, May 

 (430); Closter, October (499) ; Hudson Heights, May (435C). 



North Carolina : Salem, as Conferva sordida (Schweinitz). 



ib. Tribonema bombycinum forma tenue nom. nov. 



Conferva bombycina forma minor Wille, Ofvers. Vet.-Akad. 

 Forhand. 1879 5 : 65. p.p. 1879. Not C. minor Klebs. 



Cells 3-6 1 ti in diameter, 2-12 times as long, usually very little 

 if at all inflated ; chromatophores small, numerous {pi. 25, f 4-6). 



Exsic: Phyc. Bor. Am. C bombycina f. minor Wille, 621 

 A, B. Bridgeport, Conn. (I. Holden).(?) 



Usually growing mixed with T. bombycinum. 



New York: Botanical Garden, April (341); Van Cortlandt 

 Park, April (347), May (418). 



New Jersey : Closter, October (499A) ; Hudson Heights 



(435B). 



From the fact that this form or aggregation of forms is gener- 

 ally found associated with T. bombycinum and at times appears to 

 pass into the latter, it is to be suspected that it is simply a growth 

 stage of that species. Since, however, the evidence for this view 

 does not amount to actual proof, the present disposition is used as 

 a matter of convenience in designating the small forms. 



A form, which, when collected, appeared to be identical with 

 Conferva glacialoides Wolle, developed, after a few days, into a 

 condition corresponding to T. bombycinum f. tenue {pi. 25, f. 4, 5). 



It is unfortunate that Wille's name cannot be retained for this 

 series of forms for which it is well suited from the lack of definite 

 characters associated with it. Because Klebs made a new species 

 out of material identified by Professor Wille as belonging to his 

 Conferva bombycina f. minor, there is necessity for the new form 

 name proposed above. 



2. Tribonema minus (Wille) 

 Conferva bombycina forma minor Wille, Ofvers. Vet. Akad. For- 

 hand. 1879 5 : 65. pi. 14. f. 89. p.p. 1879 ; Mid. 1881 8 : 21. //. 



