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2o8
ZYGNEMATACEAE
chromatophore, making 3 to 8 turns in the cell; reproduction by zygo-
spores and aplanospores; conjugation lateral and scalariform; tubes
formed by both gametangia; receptive gametangia more or less cylin-
drically inflated up to 51
ju toward the middle; zygospores ellipsoid to
cylindric-ellipsoid, 34-48/1 x ioo-130/x; median wall smooth, chestnut
brown; aplanospores similar, ]"• 34-44 x 60-90 /a. (PI. XXXVI, Figs.
10-13.)
United States: Several localities near Boston, Massachusetts (Bollard
Coll.); Illinois, Coles County near Lerna.
Original collection from Disko, Greenland, August 7, 1871, by T. M.
Fries. Identity of American material verified by Rosenvinge. Cell walls of
this species are unusually light-refractive and appear brighter and better
defined than those of other species of the genus— probably due to a larger
proportion of cellulose in the walls.
219. Spirocyra quadrata (Hassall) Petit 1874. Bull. soc. hot. de
France. 21, p. 41, PI. i, Fig. 2.
Vegetative cells 24-30 /a x 70-^500 /j., with replicate end walls; 1 chromatophore,
making 1.5 to 6 turns in the cell; reproduction by zygo-
spores and aplanospores; conjugation scalariform and lateral; tubes
formed by both gametangia; receptive gametangia cylindrically inflated
toward the middle up to 60 m; zygospores ellipsoid to cylindric-ellipsoid,
33-44/1 X 50-82 /t; median wall smooth, brown; aplanospores similar
but smaller. (PI. XXXVI, Figs. 14-16.)
United States: All states from Iowa to Massachusetts.
Widely distributed in Europe, and in northern and southern China.
The form with 2 chromatophores in most cells (var. bijasciata Kirchncr
1878) has been found in Illinois, also in Clark County, Kentucky (Mclnteer
Coll.).
220. Spirogyra fritschiana Czurda 1932. Siisswasserflora Mittel-
europa. 9, p. 156. Trans. Roy. Soc. S. Africa. 18, p. 50,
Fig. 14A-B (as S. protecta var. inflata).
Vegetative cells 17-24/1 x 80-260 /t, with replicate end walls; i chromatophore;
conjugation lateral and scalariform; tubes formed by both
gametangia; fertile cells inflated toward the middle; zygospores eUip-
soid, 35-40/1 X 55-64 /x; median spore wall brown, coarsely punctate.
(PI. XXXVI, Figs. 19-20.)
South Africa, Kimberley.
221. Spirogyra goetzei Schmidle 1902. Engler's Bat. Jahrb. 30,
p. 251, PI. 4, Fig. 8.
Vegetative cells 22-25/1 x 160-^20/1, with replicate end walls; i
chromatophore, making 4 to 9 turns in the cell; conjugation scalar-