18 The Ohio Journal of Science [Vol. XVI, No. 1, 



of the forms can be satisfactorily classified. The writer has in 

 course of preparation an illustrated key to the group, in which 

 figures for all of the species will be published. 



DEBARYA Wittrock. 



This genus is in many respects the most generalized of all 

 the Zygnemales. It is distinguished by three important 

 characteristics: (1) the entire contents of the gametangia enter 

 into the making of the zygospore; (2) the zygospore is formed 

 in the conjugating tube and is not cut off from the other parts 

 of the gametangia by partition walls; (3) as the gametes move 

 toward the tube during conjugation, their place is taken by a 

 secretion of cellulose, which renders the gametangia solid and 

 highly refractive. This secretion also occurs when a vegetative 

 cell forms an aplanospore. 



Debarya glyptosperma Wittrock. 



This species has been recorded for America. It is not 

 uncommon in Massachusetts and has also been found in 

 Minnesota and Florida. In P. B.-A. No. 808 from Boswell, 

 California is a somewhat smaller variety with blue spores 

 associated with Zyg?iema peliosporum Wittr. The spores are 

 common in the material and the vegetative cells and filaments 

 occasional. Following is a diagnosis for this variety: 



Var. formosa nov. var. Cellulis vegetativis 7.5-9^ latis; 

 zygosporis 24-30^ x 30-42^i, caeruleis; ceterum ut in typo. 



Vegetative cells 7.5-9^i in diameter, zygospores 24-30/x x 30-42/x 

 steel blue, otherwise like the type. 



Debarya americana nov. sp. 



Cellulis vegetativis 9-12/z x 27-120/x, ad dissepimenta con- 

 strictis; chromatophoris cum pyrenoidibus 2; cellulis fructi- 

 feris 10-14/x x 75-180^; zygosporis ovoideis vel quadrato- 

 ovoideis, 20-40/^ x 30-40 jjl, angulis rotundatis, productis, vel 

 retusis; parthenosporis 15-20^ x 20-30/x, oblique ellipticis, cum 

 polls retusis; mesosporio subtiliter et irregulariter verrucoso, 

 maturitate luteo-brunneo. 



Vegetative cells 9-12)U x 27-120/^ constricted at the end walls, 

 chromatophore with two pyrenoids; fertile cells 10-14/^ x 75-180^; 

 zygospores ovoid or quadrately ovoid, 20-40/^ x 30-4(V, with 

 angles rounded, produced, or retuse; parthcnospores 15-20/i- 



