SPIROGYRA 185 



United States: Widely distributed from Colorado to the east coast. 



Germany and France; widely reported in other countries but not neces- 

 sarily this species; China and India. 



This species is frequent in streams and ponds in the northern Central 

 States, attached to underwater objects at first, later floating free. Although 

 described by Hilse in 1863, it was not reported in fruit until 1887 by WoUe. 

 Zygospores were described by Borge from the upper Rhine region in 1894. 

 These two publications establish the above description for S. fiuviatilis. 

 Under this name Czurda (1932) described two forms of different dimen- 

 sions with ellipsoid spores and 3-5 chromatophores and the tube formed by 

 the male cell. His illustration, however, has 2 chromatophores and the tubes 

 are formed by both gametangia. These plants evidently belong near S. 

 smithti (No. 116). Krieger follows Czurda's description. 



134. Spirogyra africana (Fritsch) Czurda 1932. Siisswasserflora 



Mitteleuropa. 9, p. 201. 



Vegetative cells 50-60 /a x i 50-500 /x, with plane end walls; 3 to 4 

 chromatophores, making 1.5 to 4 turns; conjugation scalariform; tubes 

 formed by both gametangia; receptive cells enlarged or inflated on both 

 sides up to 96 /x; zygospores ovoid, 60-67 /a ^ 78-90 /x; median spore wall 

 brown, irregularly and shallowly corrugate. 



Africa, Cape Colony; Guatemala (Kellerman Coll.). 



Very similar to 5. fiuviatilis, but has larger dimensions throughout. 



135. Spirogyra notabilis Taft 1944. Ohio Jour. Sci. 44, p. 238. 

 Vegetative cells y>-^JlJ^ x 92-230 /x, with plane end walls; 2, 3, or 4 



chromatophores, making i to 3 turns in the ceil; at conjugation the cell 

 walls are notably thickened; conjugation scalariform between short 

 gametangia; tubes formed by both gametangia, but more by the male; 

 receptive gametangia enlarged near the spore; zygospores ovoid, 48-57 ^tx 

 X 78-105^1; median spore wall of 2 yellow-brown layers, of which the 

 outer is conspicuously punctate, the inner, reticulate and finely 

 verrucose. 



United States: Texas, Austin, April 19, 1938. 



The layers of the median wall are distinct and are among the most 

 beautifully ornamented walls in the genus. 



136. Spirogyra grossii Schmidle 1901. Allgem. Bot. Zeitschr. 7, 



P-3- 



Vegetative cells 40-42 /a x 50-1 20 /a, with plane end walls; 3 chro- 

 matophores, making 2 to 4 turns in the cell; conjugation scalariform; 

 tubes apparently formed by the male gametangia; fertile cells inflated 

 to 64 ju.; zygospores ovoid, 43-51 ju, x 64-118 /x; median spore wall irreg- 

 ularly corrugate. (PI. XXX, Fig. 6.) 



Yugoslavia; Manchuria; India. 



