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ZYGNEMATACEAE
10. MouGEOTiA DROUETii Transcau 1938. Amer. Jour. Bot. 25,
p. 524, Fig. I.
Vegetative cells 14-18 ju. x 72-1 80 m, with 4 to 8 pyrenoids in a single
row; conjugation scalariform; zygospores globose in the enormously
enlarged tube and extending into the gametangia, 32-37 /a x 33-42 /x;
spore wall smooth, yellow-brown, obscured by the granular membranous
residue left after conjugation. (PI. I, Fig. 10.)
South America, Brazil, state of Ceara, Fortaleza (Drouet Coll.).
11. MouGEOTiA KERGUELENSis Kricgcf 1941. Rabeuhorst's Krypt-
ogamenflora. 13 (2), p. 134.
Vegetative cells about i2ai x 48-96^; chromatophore with several
pyrenoids in a single row; conjugation scalariform; zygospores in the
conjugating tubes, sometimes extending slightly into the gametangia,
about 27 /x in diameter; spore wall smooth, dark blue. (PI. XIV, Fig. i.)
Kerguelen Islands, South Indian Ocean (Werth Coll.).
12. MouGEOTiA MALTAE Skuja 1 926. Acta Horti Bot. Univ. Lat-
viensis. 1, p. 109, Fig. i.
Vegetative cells 17-22/Li x 60-1 20 (-200) i^; chromatophore nearly
as long as the cell, with 4-8 pyrenoids in a single row; conjugation
scalariform; zygospores formed wholly in the conjugating tube, glo-
bose ( ^50-) 32-35 (-40) u in diameter; spore wall blue, smooth, surrounded
by a gelatinous layer 4-6^1 in diameter. (PI. XIV, Fig. 2.)
Latvia, Usma Lake.
13. MouGEOTiA REiNscHii Tfanseau 1934. Trans. Amer. Micros.
Sac. 53, p. 224.
Vegetative cells 15-24^1. in diameter; chromatophore with 4-8 pyre-
noids in a single row; conjugation lateral, very rarely scalariform;
zygospores quadrately ovoid, 24-30 /a x 26-32 m; spore wall brown,
smooth. (PI. XIV, Fig. 3.)
United States: Illinois; Ohio.
Germany; Poland; Czechoslovakia; lava.
In a collection from Fayettevillc, Ohio, May 8, 1934, several spores
resulting from scalariform conjugation were found among the hundreds
resulting from lateral conjugation. Formerly classified as Mougeotia gracilis
(Reinsch) Czurda.
14. Mougeotia sphaerocarpa Wolle 1887. Freshwater Algae of
the United States, p. 227, PI. 146, Figs. 1-2.
Vegetative cells 19-24/i x 60-1 20 (-240) m; chromatophore platelike,
with 4-16 pyrenoids in an irregular row; conjugation scalariform;
zygospores formed in the greatly enlarged conjugating tubes and ex-