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184 ZYGNEMATACEAE
130. Spirogyra minor (Schmidle) Transeau 1944. Ohio Jour. Sci.
44, p. 243. Schmidle. Hedwigia. 40, p. 46 (as S. fnalmeatia
var. minor).
Vegetative cells 55-60/Li x 150-300/^; 3 (rarely 4) chromatophores;
conjugation scalariform; tubes formed by both gamctangia; fertile cells
cylindric; zygospores ellipsoid, 50-60 /j. x 90-1 80 /a; median spore wall
irregularly reticulate, yellow-brown.
United States: Indiana (Ben Smith Coll.); Mississippi, Jackson; Texas
(Davidson Coll.).
Brazil; South Africa (Stephens Coll.); China, Szechwan (Li Coll.).
This species name occurred in two editions of my mimeographed key
to this genus where the date was given as 1925. There was no formal publication
in a journal until 1944. Between these two dates all the above
records accumulated.
131. Spirogyra brunnea Czurda 1932. Siisswasserfiora Mittel-
europa. 9, p. 197. Fritsch & Rich. Trans. Roy. Soc. S.
Africa. 18, p. 51. 1929 (as S. reinhardii var. africana).
Vegetative cells 56-71 /x x 85-280 /a, with plane end walls; 3 to 5
chromatophores, making 2 to 3 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells shortened, and slightly inflated
on both sides; zygospores ovoid, 55-66 /x x /x; 73-94 median spore wall
brown, intricately reticulate. (PI. XXX, Figs. 1-2.)
South Africa, Transvaal and Griqualand.
132. Spirogyra scripta Nygaard 1932. Trans. Roy. Soc. S. Africa.
20, p. 144, Fig. 48.
Vegetative cells 51-64/x x 220-300^^, with plane end walls; 4 to 5
chromatophores, making about 2 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells inflated to Gy-yi /x, shortened;
zygospores ellipsoid, more or less pointed, 54-60 /a x 91-107 m; median
spore wall brown, with an intricate pattern of branched, short, dark
crevices and corrugations. (PI. XXX, Figs. 3-4.)
South Africa, Transvaal.
133. Spirogyra fluviatilis Hilse 1863. In Rabenhorst's Algen Eu-
ropas, No. 1476. Flora Europaea Algarum. 3, p. 243. 1868.
Wolle. Freshwater Algae, p. 216, PI. 136, Figs. 1-3.
Vegetative cells 30-45^4 x 70-240^1, with plane end walls; 3 to 4
chromatophores, making 1.5 to 3.5 turns; conjugation scalariform;
tubes formed by both gametangia; fertile cells shortened and inflated to
70/1; zygospores ovoid, 47-85 /x x 68-1 i0)u.; median spore wall brown,
corrugate, or finely wrinkled. Remarkable branched rhizoids develop
from some of the cells. (Fl. XXX, Fig. 5.)