SPIROGYRA 159 



cells to globose, 28-38/1 x 50-83 /i; median spore wall yellow, smooth. 

 (PI. XXIII, Fig. 5.)" 



United States: Common throughout. 



Widely distributed in Europe, reported from East and South Africa, 

 Asia, South America, and Australia. In Kentucky (Mclnteer Coll.) this 

 species was found hybridizing with S. porticalis. 



The distinctive features of this very common species are the ovoid 

 spores and the nearly cylindric sporiferous cells. 



31. Spirogyra oltmannsii Huber-Pestalozzi 1930. "Algen aus 



dem Knysnawalde in Siidafrica." Zeitsch. f. Bot. 23, 

 p. 448. 

 Vegetative cells 23-27 /u, x 70-125 /x, with plane end walls; i chro- 

 matophore, zygospores unknown; sporangia cylindric; aplanospores 

 ovoid, 22-26/1 X 30-42 /x; median spore wall outwardly [.^] scrobiculate. 

 Described from immature specimens. (PI. XXIII, Fig. 6.) 

 South Africa. 



32. Spirogyra suecica Transeau 1934. Ohio Jour. Sci. 34, p. 420. 



(^iS*. varians var. gracilis) Borge 1923. Arl{. Bot. 6, p. 11, 

 PI. I, Fig. 2. 



Vegetative cells 26-29 /x ^ 80-175 /(-, with plane end walls; i chro- 

 matophore, making i to 4.5 turns; conjugation scalariform or rarely 

 lateral between some cells; tubes formed by both gametangia; fertile 

 cells inflated on both sides, usually more on the conjugating side, up to 

 60 /J.; zygospores usually ovoid, 32-39/1 x 38-60/1; median spore wall 

 yellow, smooth. (PI. XXIII, Fig. 7.) 



United States: Iowa; Ohio; Florida. 



Sweden; France. 



33. Spirogyra gallica Petit 1880. Les Spiro gyres des environs de 



Paris, p. 23, PI. 6, Figs. 1-3. 



Vegetative cells 72-75/1 x 1 50-500 /t, with plane end walls; i chro- 

 matophore, making 4 to 8 turns in the cell; conjugation scalariform; 

 tubes formed by both gametangia; fertile cells cylindric; zygospores 

 ovoid to ellipsoid, 62-66/1 x 90-110 /t; median spore wall yellow, smooth. 

 (PI. XXIII, Fig. 8.) 



France; Belgium; Germany. 



This is the largest of the Spirogyras with i chromatophore; differs from 

 S. condensata of about the same dimensions in the ovoid spores and the 

 much longer vegetative cells. 



34. Spirogyra lacustris Czurda 1932. Siisswasserflora Mitteleu- 



ropa. 9, p. 176, Fig. 182. 



