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234<br />
ZYGNEMATACEAE<br />
cncd and rcilexcd; receptive gametangia inflated up to 135/^; zygospores<br />
ellipsoid, 75-105^1. x 95-1 35 Ml median spore wall yellow and<br />
smooth.<br />
United States: Florida. Original collection by John Donnell Smith,<br />
March, 1878, in southwest part of the peninsula; again collected by L. H.<br />
Tiffany in the same region in April, 1933.<br />
South Africa, Cape Town (E. L. Stephens Coll.).<br />
5. SiROGONiuM PSEUDOFLORIDANUM (Prcscott) Tfanscau 1944.<br />
Ohio Jour. Set. 44, p. 243. Farlowia. 1, pp. 360-61, Fig. i.<br />
1944.<br />
Vegetative cells 51-60 jn x 150-275/^, each with 4 to 5 chromatophores;<br />
straight, or making up to 1.5 turns in the cell; receptive gam-<br />
etangia somewhat inflated; zygospores eUipsoid, 63-70JU. x 100-120^;<br />
median wall brown, finely corrugate and granulate. (PI. XL, Fig. 6.)<br />
United States: Wisconsin, Vilas County.<br />
6. SiROGONiuM CEYLANicuM Wittrock 1889. WittFock and Nord-<br />
stedt Algae Exsiccatae, No. 358.<br />
Vegetative cells 69-75 /a ^ 1 40-300 /x; 7 chromatophores, nearly<br />
straight; conjugation direct between reflexed gametangia; receptive<br />
gametangia inflated, 120-165/^ x 135-300/1; zygospores ellipsoid, 100-<br />
iiOju. X 135-195/i.; median spore wall thick, yellow-brown with minute<br />
shallow depressions that have no distinct edges but are easily seen<br />
when viewed edgewise.<br />
Ceylon.<br />
7. SiROGONiuM vENTERSicuM Transcau 1934. Trans. Amer.<br />
Micros. Soc. 53, p, 229.<br />
Vegetative cells 65-72 /j. x i i 0-250 /x; 5 to 8 chromatophores, straight,<br />
or making i turn; conjugation direct; receptive gametangia inflated to<br />
ioo-140/i; spores mostly ellipsoid, rarely somewhat ovoid, 80-90/x x<br />
133-152/4; median spore wall brown, densely and irregularly verrucose.<br />
(PI. XL, Fig. 7.)<br />
South Africa, Transvaal, Ventersdorp.<br />
8. SiROGONiuM MELANospoRUM (Randhawa) Transeau 1944.<br />
Ohio Jour. Sci. 44, p. 243. Proc. Indiaji Acad. Sci. 8,<br />
p. 364. 1938.<br />
Vegetative cells 70-90/1 x 140-260 /x, each with 6 to 9 nearly<br />
straight chromatophores; conjugation direct; receptive gametangia in-<br />
flated up to 120-166 /x; zygospores usually ellipsoid, go-iio/i x 140-160 /t;<br />
median spore wall brown to black, verrucose. (Pi. XL, Fig. 8.)