SPIROGYRA 211 



tubes formed by both gametangia; sterile cells more or less cylindrically 

 inflated up to 45 /x; fertile cells enlarged; zygospores ellipsoid, 25-35 /j- ^ 

 48-86jU.; median spore wall smooth, yellow at maturity. (PI. XXXVII, 

 Fig- 9-) 



China, Szechwan, November to January, 1933-34. 



230. Spirogyra croasdaleae Blum 1943. Amer. Jour. Bot. 30, 



p. 783, Figs. 6-8. 



Vegetative cells 17-25 /x x 120-300 /«., with replicate end walls; i 

 chromatophore, making 4 to 8 turns in the cell; conjugation scalar- 

 iform; tubes formed by the male gametangia; fertile cells much inflated 

 on the conjugating side; zygospores eUipsoid, 26-33 /x x 46-62 /x; median 

 wall yellow, smooth. (PI. XXXVII, Fig. 14.) 



United States: Massachusetts, Naushon Island, July 20, 1942. 



231. Spirogyra lamellosa Jao 1935. Sinensia. 6, p. 605, PI. 9, 



Fig. 99. 



Vegetative cells 29-32 iu. x 188-280 /a, with replicate end walls; i 

 chromatophore, making 4 to 6 turns in the cell; conjugation scalar- 

 iform; tubes narrow and long (32-96 /".), formed by both gametangia; 

 fertile cells cylindric or enlarged; zygospores ellipsoid to cylindric- 

 ellipsoid, 32-42 /a x 80-102 /a; outer wall colorless, lamellate, 3-4/"- in 

 thickness; median wall smooth, yellow at maturity, (PL XXXVII, 

 Fig. 16.) 



China, Szechwan, December, 1933. 



The conjugating tubes are similar to those of Numbers 243, 245, and 

 264. 



232. Spirogyra laxa Kiitzing 1849. Species Algarum, p. 438. 



Tabulae phycologicae. 5, PL 30, Fig. 5. 



Vegetative cells 30-36 /a x 120-320 as with replicate end walls; i 

 chromatophore, making 3 to 5 turns; conjugation lateral and scalar- 

 iform; tubes formed by both gametangia; fertile cells cylindric; zygo- 

 spores ellipsoid, with more or less pointed ends, 30-33 /x x 60-82/^1; me- 

 dian spore wall yellow, smooth. 



United States: Iowa; Michigan; Indiana. 



Nova Scotia (Hughes Coll.); Europe. 



233. Spirogyra tjibodensis Faber 1912. Ann. ]ard. Bot. Buiten- 



zorg. 26, p. 265. 



Vegetative cells 45-50 /x x 80-130 /i, with repHcate end walls; i chro- 

 matophore, making about 4 turns; reproduction by zygospores and 

 aplanospores; conjugation scalariform; tubes formed by both gam- 



