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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: Undercliff, 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. 18798: 65. 5.5. 1879. Not C. minor Klebs. 
Cells 3-6 بر‎ in diameter, 2-12 times as long, usually very little 
if at all inflated ` chromatophores small, numerous (ai, 25, f. 4-6). 
Exsıc.: Phyc. Bor. Am. C. dombycina f. minor Wille, 62r 
A, B. Bridgeport, Conn. (I. Holden).(?) 
Usually growing mixed with T. dombycinum. 
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. dombycinum 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 (pl. 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. För- 
hand. 1879°: 65. pl. r4. f. 89. p. p. 1879 ; ibid. 1881°: 21. ۶۰ 
