ZYGNEMA 35 



54. Zygnema germanicum Czurda 1932. Susswasserflora Mittel- 



europa. 9, p. 125, Fig. 129. 



Vegetative cells 26-28 /^ x 30-36 /j.; conjugation scalariform; zygo- 

 spores in one of the gametangia; receptive gametangia greatly enlarged 

 or inflated; zygospores globose or compressed-globose, 36-38 /a x 36-45^; 

 median spore wall brown, thick, pitted; pits 6-7 ju, in diameter. (PI. V, 

 Figs. 8-9.) 



Germany; Czechoslovakia. 



55. Zygnema insigne (Hassall) Kiitzing 1849. Species Algarum, 



p. 444. 



Vegetative cells 26-32 /x x 26-60 ju; conjugation scalariform or lat- 

 eral; zygospores in one of the gametangia; receptive gametangia cyUn- 

 dric or enlarged; zygospores globose or subglobose, 27-33 /x ^ 27~35/^5 

 median spore wall yellow-brown, smooth; aplanospores 28-33 /x, ovoid 

 to cyUndric-ovoid, otherwise similar. (PI. V, Figs. 10-12.) 



United States: California to Massachusetts and New Jersey. 



Widely reported from Europe, Australia, South America, and China. 



Many of the records of this species are based on specimens with imma- 

 ture, colorless spores. These specimens should not have been named. 



56. Zygnema fanicum Li 1934. Trans. Amer. Micros. Soc. 53, 



p. 212, PI. 18, Figs. 17-19. 



Vegetative cells 28-33 /x x 28-80 /x; conjugation usually scalariform, 

 sometimes lateral; zygospores in one of the gametangia; receptive gam- 

 etangia cylindric or enlarged; zygospores globose to ovoid, 30-36 /x x 

 34-42 /a; median spore wall yellow, sharply pitted; pits 4-7 /^ in diam- 

 eter, 2-3 /x apart, each with a distinct, raised margin; aplanospores 

 similar to zygospores. (PI. V, Figs. 13-14.) 



China, Hupeh, Kiangsi, Anhwei, Szechwan, Shantung. 



57. Zygnema subfanicum Jao 1940. Sinensia. H, p, 295, PI. 4, 



Fig. I. 



Vegetative cells 24-26 /x x 30-65 /j., with 2 stellate chromatophores; 

 conjugation scalariform; spores formed in one of the gametangia; re- 

 ceptive gametangia enlarged on the conjugating side; zygospores glo- 

 bose to subglobose, 29-35 ju. in diameter; median wall pitted; pits 7-8 /x 

 in diameter, 1.8-2.7^1. apart, yellow-brown in color. (PI. V, Fig. 15.) 



China, Hunan. 



58. Zygnema transeauianum G. C. Couch 1944. Ohio Jour. Set. 



44, p. 277. 

 Vegetative cells 30-32 /x x 20-60 /x; conjugation scalariform; recep- 

 tive gametangia enlarged or slightly inflated on the conjugating side; 



