SPIROGYRA 153 



China, Szechwan. 



The separation of the sporiferous cells is an unusual feature but also 

 occurs frequently in S. parvula. 



10. Spirogyra teodoresci Transeau 1934. Ohio Jour. Set. 34, 



p. 420. (=S. varians var. minor) Teodoresco. Beih. Bot. 

 Zentralbl. 21, abt. 2. 1907. 



Vegetative cells 24-30 iu. x 42-90 /a, with plane end walls; i chro- 

 matophore, making i to 6 turns; conjugation scalariform and lateral; 

 tubes formed by both gametangia; fertile cells strongly inflated on the 

 conjugating side; zygospores elHpsoid, 26-33 /a ^ 45~55/^5 median spore 

 wall smooth, yellow. (PI. XXI, Fig. 8.) 



United States: Iowa; Illinois; Michigan; Kentucky; New York; Massa- 

 chusetts. 



Rumania; China, Nanking, Peiping (Li Coll.). 



Probably included in many records of S. varians, from which it is 

 distinguished by its smaller dimensions throughout, 



11. Spirogyra pseudovarians Czurda 1930. Beih. Bot. Zentralbl. 



47, p. 32. 



Vegetative cells 36-^9 M x 35-75 M, with plane end walls; chromato- 

 phores i (rarely 2); conjugation scalariform; tubes formed by both 

 gametangia; fertile cells swollen, mostly on the conjugating side; zygo- 

 spores ellipsoid, 33-37 it^ x 47-57 m; outer spore wall thick, transparent, 

 scrobiculate; median spore wall reddish-brown, smooth; sterile cells 

 more or less swollen. (PI. XXI, Figs. 12-14.) 



Czechoslovakia; Austria. 



Distinguished by the heavy, transparent, shallow-scrobiculate outer wall. 



12. Spirogyra varians (Hassall) Kiitzing 1849. Species Algarum, 



p. 439. Includes S, woodsii Czurda and S. varians 

 (Kiitzing) Czurda. 



Vegetative cells (28-) 30-40 ju, x 30-120 /a, with plane end walls; i 

 chromatophore, with i to 5 turns; conjugation scalariform and lateral; 

 tubes formed by both gametangia; fertile cells usually inflated on the 

 conjugating side only, rarely on both sides; some of the sterile cells 

 usually inflated; zygospores mostly ellipsoid, usually some of them 

 ovoid and very rarely globose, 32-40 ;u, x 50-100/^; median spore wall 

 yellow, smooth; aplanospores similar. (PI. XXII, Fig. i.) 



Generally distributed in the United States, including Alaska. 



Also reported from British Columbia to Newfoundland. 



Widely distributed in Europe, Asia, Africa, and Australia. 



A highly variable species, but usually readily identified by the combi- 



