A NEW SPECIES AND A NEW VARIETY OF ALG^ 

 FROM ONEIDA LAKE 



By Dr. E. N. Transeau 

 Ohio State University, Columbus, Ohio 



Mougeotia americana nov. sp. Plate A. 



Cellulis vegetativis 4 microns x 40-120 microns; cellulis 

 conjugatis geniculatis; zygosporis inter 4 cellulis sitis, 

 irregulariter quadratus, cum lateribus vel concavis vel 

 tumidis, angulis productis, 13-24 microns x 18-32 microns; 

 mesosporio hyalino leevo; aplanosporis oblique ellipticis, 

 polis truncatis, 10-14 microns x 20-20 microns. 



Vegetative cells 4 microns x 40-120 microns; conjugating 

 cells slightly or strongly geniculate ; zygospore adjoined by 

 four cells, irregularly quadrate with concave or convex 

 sides, the space between the zygospore and the sporangium 

 walls being filled with (cellulose), 13-24 microns x 18-32 

 microns, wall smooth, transparent, aplanospores obliquely 

 elliptical, ends truncate at the middle of very long genu- 

 flexed vegetative cells, 10-14 micror.s x 20-26 microns. 



Field No. 929, southwest side of Lower South Bay, 

 Oneida Lake, N. Y. Clay bottom, water 4 feet deep. July 

 20, 1916. Collector F. C. Baker. Plate A. Mougeotia 

 americana nov. sp. 



CEdogonium crassum longum nov. var. 



Var. oogoniis oosporisque comparate ad cellulas vegetativas 

 longioribus ; ceterum ut in type. 



Variety with elongated oogonia and oospores; otherwise 

 similar to the type. 



Diam. veg. cells, female plant 40-52 microns, length 100-240 microns 

 Diam. " " male plant 36-44 " " 100-180 " 



Diam. oogonia 68-84 " " 120-180 " 



Diam. oospore 66-So " " 100-125 " 



Diam. antheridia 34-40 " " 8-14 



Field No. 816, third bay, north side Short Point Bay, 

 Oneida Lake, N. Y. Black mud bottom, water y/2 feet 

 deep. July 17, 1916. Collector F. C. Baker. 



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