Nov., 1915] Notes on the Zygnemales 27 



S. diluta Wood. 



I first came across this species in Mr. Bullard's collection 

 from the pond west of Winter Pond, Winchester, Mass. On 

 going over Wood's description, its identity with 5. diluta is 

 unmistakable. The position, color and form of the spore, and 

 the shape of the fertile cells is perfectly represented in Wood's 

 figure. The dimensions also correspond. Wolle is responsible 

 for confusing this species with 6*. nitida (Dillw.) Link, but a 

 glance at Wood's figure is sufficient to show that it is very 

 different from that species. The P. B. A. specimen No. 513 

 (labelled S. nitida) from Bridgeport, Conn., belongs here. Miss 

 Grace Stone also sent me a collection of this species from near 

 New York City. In the U. S. National Herbarium is another 

 specimen from Bois Sabbi, Louisiana, April 7th, 1891, (A. B. 

 Langlois). Recently the species has been collected at Donnel- 

 son, Illinois, by Mr. Frank Harris. 



The vegetative cells are usually shorter than in S. nitida, 

 the spores are ovoid, not ellipsoid, and the spore wall is verru- 

 cose, or reticulate-verrucose, chestnut brown in color. In herb. 

 E. N. T. Coll. No. 2900. 



S. crassa Kutzing. 



Var. formosa nov. var. Varietas gracilis, cellulis vegetativis 

 80-95m X 80-270yu; zygosporis 88-100^ x 120-150^ x 70-90^; cet- 

 erum ut in typo. 



A small variety, vegetative cells 80-95/1 x 80-270^: zygo- 

 spores 88-100/1 X 120-150m X 70-90m; otherwise similar to the 

 type. Type in herb. E. N. T. Coll. No. 1939. This variety 

 occurs in a pond east of Ashmore, 111. 



S. submaxima Transeau. 



This species which was described from Illinois has been 

 found with nearly the same dimensions in the collections from 

 Middlesex Fells, and South Peabody Station, Mass., sent me 

 by Mr. Chas. Bullard. 



S. micropunctata nov. sp. 



CelluHs vegetativis 30-36/i x 120-300/t, dissepimentis planis, 

 chromatophoris singulis anfractibus arctis 3-7; cellulis fructi- 

 feris modo binis vel quaternis inter cellulas vegetativas dis- 

 tributis, modo continuis, altero latere (in quo conjugatio 



