SPIROGYRA 203 



199. Spirogyra undulisepta Randhawa 1938. Proc. Indian Acad. 



Set. 8, p. 352. 



Vegetative cells 13-18 ju. x 96-154 /t with semireplicate end walls; i 

 chromatophore, making 3 to 5 turns; conjugation scalariform; tubes 

 formed by both gametangia; receptive gametangia inflated in the mid- 

 dle up to 30-42 /a; zygospores ellipsoid, 20-30 m x 40-53 m; median spore 

 wall yellow-brown, with an undulate outer surface. (PI. XXXV, Fig. 4.) 



India, Fyzabad, Upper Punjab, February 8, 1937. 



SPECIES WITH REPLICATE END WALLS 



200. Spirogyra tenuissima (Hassall) Kiitzing 1849. Species Al- 



garum, p. 437. 



Vegetative cells 8-13, a x 40-250^1, with replicate end walls; i chro- 

 matophore, making 3 to 6 turns; conjugation lateral and scalariform; 

 tubes formed by both cells; fertile cells greatly inflated or enlarged 

 toward the middle; zygospores and aplanospores ellipsoid, 25-32 /tx x 

 40-70 iu.; median spore wall yellow, smooth. (PI. XXXV, Figs. 5-6,) 



United States: Abundant in the eastern half in early spring. 



Canada; Europe; Asia; South America; Africa; Australia; New Zealand. 



Highly variable in dimensions within the above limits, also in the 

 angles formed by laterally conjugating cells. Several species and varieties 

 have been described which are not listed here. If these variants are recog- 

 nized, many more can be separated on equally good grounds. The same 

 statement holds for the next species, S. inflata. 



Found hybridizing with S. weberi at Belding, Michigan. Spores in cells 

 of S. weberi filaments were ovoid, in the S. tenuissima filaments, ellipsoid. 



201. Spirogyra inflata (Vaucher) Kiitzing 1843. Phycologia 



Generalis, p. 279. 

 Vegetative cells 15-20/^ x 45-230 /x, with repHcate end walls; i chro- 

 matophore, making 2.5 to 6 turns; conjugation lateral and scalariform; 

 tubes formed by both gametangia; fertile cells inflated to 35-48 /x.; zygo- 

 spores and aplanospores ellipsoid, 27-36 /x x 50-76 /x; median spore wall 

 yellow, smooth. (PI. XXXV, Figs. 7-8.) 



United States: From Minnesota and Louisiana eastward to the Atlantic 

 coast. 



Southern and eastern Canada; Europe; Asia; Africa. 



202. Spirogyra cylindrica Czurda 1932. Siisswasserfiora Mittel- 



europa. 9, p. 150. 



Vegetative cells i3-i6ft x I40-350a<., with replicate end walls; i 

 chromatophore, making 2.5 to 6 turns in the cell; conjugation lateral 



