Download PDF

66 ZYGNEMATACEAE
igan, GDlorado, and Utah. Also in Canada from western Ontario to Nova
Scotia. Probably occurs throughout the northern and western provinces.
Reported from all the continents.
In terrestrial forms the cell sap may be purple, the cells somewhat
smaller, and the walls thick, lamellate, and colored yellow or brown. In a
collection from Kwangtung, China, the sporangia had a distinct outer pectic
layer.
2. Zygogonium mirabile (W. & G. S. West) Transeau 1933. Ohio
Jour. Sci. 33, p. 158. Jour. Bot. 35, p. 39. 1897.
Vegetative cells 12-13.5^ x 18-50^1; chromatophores 2, rather indis-
tinct, each with a central pyrenoid; conjugation scalariform; zygospores
formed in the enlarged conjugating tubes, which are walled ofT from
the original cells; sporangium ovoid with prominent equatorial suture;
spores filling the sporangium, ovoid, 13.5-17/i. x 19-32^1., smooth, but
possibly immature in the one known collection. (PI. X, Figs. 17-19.)
Portuguese West Africa, Huilla, April, i860 (Welwitsch Coll.).
3. Zygogonium pectosum Taft 1944. Ohio Jour. Sci. 44, p. 238.
Vegetative cells 9-12 /a x 12-108 /x, with 2 pillow-shaped chromatophores,
sometimes elongate with flat ends; conjugation scalariform and
lateral; zygospores formed in the greatly enlarged tubes; zygospores
globose or subglobose (15-) 20-25/1 x 18-25/1, with a smooth, slate-blue
wall; aplanospores cylindric-ovoid, 9-10/1 x 12-16/1, also slate-blue;
sporangium outer wall a 2-4/1 layer of pectic compound. During conjugation
the cells elongate and the walls change to pectic compounds
and become greatly thickened. (PI. XI, Figs. 1-3.)
1940.
United States: Louisiana, near Hornbeck on wet seepage slopes, April,
4. Zygogonium hansgirgii (Schmidle) Transeau 1933. Ohio
Jour. Sci. 33, p. 159. Hedivigia. 39, p. 160. 1900 (as Zygnema
hansgirgii).
Vegetative cells 8-12/1 x 30-60/1, irregular; filaments short; conjugation
unknown; aplanospore variable, ovoid, about the same diam-
eter as the cells; median wall brown, with small angular protuberances
(vcrrucose). (PI. XI, Figs. 4-6.)
India, Igatpuri, 1895.
5. Zygogonium talguppense Iyengar 1932. Rev. Algolog. 6,
pp. 263-74.
Filaments forming a thick felt on soil, increasing in width up-
wards, often branching below; lower cells of the filament 12-16/1 x
30-60 /t, the upper 17-20/1 x 30-90/1; conjugation unknown; apian-