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SPIROGYRA 171<br />
formed by both gametangia; fertile cells cylindrlc; zygospores broadly<br />
ellipsoid, 57-58 /x x 69-71 /x; median spore wall smooth.<br />
South Africa, Angola, July, 1854.<br />
78. Spirogyra parvispora Wood 1869. Proc. Amer. Phil. Soc. H,<br />
p. 139. 1872. Smithson. Contribu. Knowledge. 19, p. 169,<br />
PI. 15, Fig. 7.<br />
Vegetative cells about y^p- x 150-300 ft, with plane end walls; 4<br />
chromatophores, making 1.5 turns; conjugation scalariform; tubes<br />
formed by both gametangia; fertile cells not inflated; spores ellipsoid,<br />
ft 50 X 75-100 /(a; median spore wall brown, smooth. (PL XXVI, Fig. 16.)<br />
United States: Florida.<br />
79. Spirogyra turfosa Gay 1884. Essai Monogr. Conjug., p. 187,<br />
PI. 4, Fig. 3.<br />
Vegetative cells 68-78^1 x 68-350^4, with plane end walls; 3-4 chro-<br />
matophores, making 1.5 to 4 turns; fertile cells cylindric; conjugation<br />
scalariform; tubes formed by both gametangia; zygospores ellipsoid,<br />
pointed, 65-78/11, x 120-140^4; median spore wall smooth, yellow. (PI.<br />
XXVI, Fig. 17.)<br />
United States: Kansas; Mississippi; Alabama.<br />
Galicia.<br />
In the 3 collections from the United States this species was associated<br />
with 5. rivularis, which it resembles in all characteristics except size. It<br />
would be interesting to know the relative chromosome complements of these<br />
2 species. It might be a mutation from S. rivularis due to a single gene<br />
change.<br />
80. Spirogyra nitida (Dillwyn) Link 1833. Handbttch, Pt. 3,<br />
p. 262.<br />
Vegetative cells 70-80 ft x 90-300 ft, with plane end walls; 3-5 chromatophores,<br />
making .5 to 1.5 turns; conjugation scalariform; tubes<br />
formed by both gametangia; fertile cells cyUndric or enlarged; zygospores<br />
eUipsoid, rarely somewhat ovoid, 60-76 ft x 90-177 ft; median<br />
spore wall brown, smooth. (PI. XXVII, Figs. 1-2.)<br />
United States: Many records from Iowa and Wisconsin to Massachu-<br />
setts, south to Mississippi and Florida.<br />
Europe; India; Australia; China; South Africa.<br />
This species consists of many overlapping forms that differ only slightly<br />
in dimensions, hence the spread in cell diameters. Near Starkville, Mississippi,<br />
I found this species hybridizing with S. crassa. In the undrained pond<br />
there were also the resulting hybrid segregates.<br />
81. Spirogyra hymerae Britton & Smith 1942. Ohio Jour. Sci.<br />
42, p. 70.