20O ZYGNEMATACEAE 



187. Spirckiyra esthonica (Skuja) Czurda 1932. Siisswasserfiora 



Mitteleiiropa. 9, p. 180, Fig. 191. Acta Horti Bot. Unit/. 

 Latuiensis. 3, p. 109 (as S. punctata var. esthonica). 

 Vegetative cells 27-33^0. x 90-360 /a, with plane end walls; i chro- 

 matophore, making 3 to 9 turns in the cell; conjugation scalariform; 

 tubes formed largely by the male gametangia; receptive gametangia 

 inflated up to 60 /x; gametangia usually separated by sterile cells; zygo- 

 spores ellipsoid, 39-50M x 64-115/it; median wall irregularly corrugate 

 with minute punctations between the ridges. (PI. XXXIV, Figs. 2-3.) 

 Estonia, July, 1927. 



188. Spirogyra suomiana Transeau 1934. Ohio Jour. Sci. 34, 



p. 420. Hirn, Karl E. Acta Soc. pro Fauna et Flora Fen- 

 nica. 11 (10), p. 10, PL i, Fig. 3. 1895. 

 Vegetative cells 33-40 m x 100-240 /a, with plane end walls; i chro- 

 matophore, making several turns in the cell; conjugation scalariform; 

 tubes formed by the male gametangia; receptive gametangia inflated to 

 58-73 /x; gametangia separated by much longer sterile cells; zygospores 

 ovoid, 45-53 A^ X 75-90 /m; median wall golden yellow, coarsely punctate. 

 (PI. XXXIV, Fig. 4.) 



Finnish Lapland; China, Tsingtao (Li Coll.); Manchuria. 



189. Spirogyra punctiformis Transeau 1914. Amer. ]our. Bot. 



1, p. 294. 



Vegetative cells ly-Tpi*. x 120-390^1, with plane end walls; i or 2 

 chromatophores, making 3 to 6 turns; conjugation scalariform; con- 

 jugating tubes usually produced by the male gametangia; fertile cells 

 in pairs or singly between vegetative cells, inflated to 45-50 a^; zygo- 

 spores ovoid, 40-48 /x X 60-iiOiLi; median spore wall yellow, punctate. 

 (PI. XXXIV, Figs. 5-6.) 



United States: Iowa; Illinois. 



190. Spirogyra reflexa Transeau 1915. Ohio Jour. Sci. 16, p. 28. 

 Vegetative cells 30-44 a^ x 120-300^1, with plane end walls; i chro- 



matophore, making 3 to 8 turns; conjugation scalariform; tubes formed 

 by the male gametangia; fertile cells inflated or enlarged and strongly 

 reflexed, single or in groups of 2 or 4; zygospores and aplanospores 

 ellipsoid, 44-64/j. x 90-150/^-; median spore wall yellow-brown, smooth. 

 (PI. XXXIV, Figs. 7-8.) 



United States: Illinois; Michigan; Indiana; Mississippi. 



191. Spirogyra micropunctata Transeau 1915. Ohio Jour. Sci. 



16, p. 27. 

 Vegetative cells 30-36/x x 120-300^, with plane end walls; i chro- 



