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i66 ZYGNEMATACEAE<br />
34-38^1 X 58-68 /x; median spore wall yellow to yellow-brown; scrobic-<br />
ulate. (PI. XXIV, Fig. 17; PI. XXV, Figs. &-y.)<br />
United States: Utah; Wisconsin; Illinois; Kentucky; Michigan; Ohio;<br />
Mississippi.<br />
Austria.<br />
Differs from S. varians in the scrobiculate median spore wall.<br />
58. Spirogyra aphanosculpta Skuja 1937. Hedwigia. 77, p. 55.<br />
Vegetative cells 32-38/a x 50-119/1, with plane end walls; i chromatophore,<br />
making i to 4 turns; conjugation scalariform; tubes formed<br />
by both gameiangia; female gametangia 43-150/1 in length, cylindric<br />
or inflated on the conjugating side; sterile cells sometimes inflated;<br />
zygospores ellipsoid to cylindric-ellipsoid, 31-40/1 x 43-81 /t; median<br />
spore wall yellow-brown, punctate with angular and irregular pits.<br />
(PI. XXV, Fig. 8.)<br />
United States: New Hampshire, Hanover (Blum Coll.).<br />
Greece, Taygetus; Africa, Cape Colony (Stephens Coll.).<br />
59. Spirogyra kaffirita Transeau 1934. Tm?2s. Amer. Micros.<br />
Soc. 53, p. 228, Fig. 59.<br />
Vegetative cells 39-45/1 x 65-140/1, with plane end walls; i chromatophore;<br />
conjugation scalariform; tubes formed by both gametangia;<br />
fertile cells inflated on the inner side; zygospores ellipsoid, 32-40,1 x<br />
45-6o(-75) p-'y median spore wall yellow, shallow-granulate, reticulate.<br />
(PI. XXV, Fig. II.)<br />
Africa, Cape Colony (Stephens Coll.).<br />
60. Spirogyra tuberculata Lagerheim 1896. Wittrock and Nord-<br />
stedt Algae Exsiccatae, No. 1379.<br />
Vegetative cells 35-37 /^ x 70-165/1, with plane end walls; i chromatophore;<br />
conjugation scalariform; tubes formed by both gametangia;<br />
fertile cells inflated on both sides; zygospores ellipsoid with rounded<br />
ends, 30-38/1 x 50-67 /j.; median spore wall yellow, irregularly verrucose.<br />
Sweden, Uppsala.<br />
The inflation of the fertile cells and the smaller dimensions distinguish<br />
this species from S. australensis.<br />
61. Spirogyra daedalea Lagerheim 1888. Nuova Notarisia, p. 592.<br />
Vegetative cells 33-36/1 x 180-330/1, with plane end walls; i chro-<br />
matophore, making 2 to 3.5 turns; conjugation scalariform; tubes<br />
formed by both gametangia; fertile cells cylindric or enlarged to 36-45/1,<br />
and shortened; zygospores ellipsoid, 30-40/1 x 50-96/1; median spore<br />
wall yellow-brown, very irregularly corrugate. (PI. XXV, Figs. 9-10.)<br />
United States: Iowa.