Nov., 1915] Notes on the Zygnemales 29 



subinflatis; tubo conjugationis ex cellula mascula emisso; 

 zygosporis lenticularibus vel globoso-lenticularibus, 80-120/x x 

 110-195^1, membrana media scrobiculis obsita, brunnea. 



Vegetative cells 75-100/x x 210-360ju, end walls plane, 7-10 

 chromatophores, either straight, or spiral making .1-.5 turns; 

 fertile cells inflated or subinflated; conjugating tube formed by 

 the male cell; zygospores lenticular or globose-lenticular 

 80-120// X 110-195/1, median wall brown, pitted. Type in herb. 

 E. N. T. Coll. No. 2661, 2665. Coffeen, Illinois. 



This is one of the most remarkable forms described in this 

 genus. It combines large size, the lenticular spore form, and 

 the habit of forming the conjugating tube entirely by the male 

 cell. The conjugating tube has walls heavier than those of any 

 known species. Conjugation is both lateral and scalariform, 

 and occurs between scattered cells, very rarely continuous for 

 6-8 cells. In the fruiting condition the filaments form a mesh- 

 work which suggests the specific name. It has thus far been 

 found only in the Path Pond, north of Coffeen, Illinois. 



S. protecta Wood. 



A study of American specimens of this species from Massa- 

 chusetts, Connecticut, New Jersey, Michigan and Illinois, 

 shows that like S. Grevilleana there are always some cells with 

 two chromatophores. I have twice found this species producing 

 aplanospores. 



S. tenuissima (Hass.) Kiitz var. rugosa Transeau. 



P. B.-A. specimen No. 456, Easton's Pt., Newport, R. I., 

 belongs to this variety rather than the type, as shown by the 

 scrobiculate spore wall. In Mr. Bullard's collection there are 

 also specimens of the variety from Pennannock, N. J., and from 

 Spy Pond, Lake St., Arlington, Mass. 



S. Farlowii nov. sp. 



Cellulis vegetativis 24-30// x 70-180//, dissepimentis repli- 

 catis; chromatophoris singulis, rarius duobus, anfractibus 

 arctis 2.5-6; cellulis fructiferis inflatis (ad 39-60/t) ; zygosporis 

 ellipticis, polls plus minus acuminatis, 32-45// x 48-93/i, mem- 

 brana media glabra, lutea. 



Vegetative cells 24-30// x 70-180//, end walls replicate; 1 

 (rarely 2) chromatophore making 2.5-6 turns; fertile cells 



