234 ZYGNEMATACEAE 



cncd and rcilexcd; receptive gametangia inflated up to 135/^; zygo- 

 spores ellipsoid, 75-105^1. x 95-1 35 Ml median spore wall yellow and 

 smooth. 



United States: Florida. Original collection by John Donnell Smith, 

 March, 1878, in southwest part of the peninsula; again collected by L. H. 

 Tiffany in the same region in April, 1933. 



South Africa, Cape Town (E. L. Stephens Coll.). 



5. SiROGONiuM PSEUDOFLORIDANUM (Prcscott) Tfanscau 1944. 



Ohio Jour. Set. 44, p. 243. Farlowia. 1, pp. 360-61, Fig. i. 

 1944. 

 Vegetative cells 51-60 jn x 150-275/^, each with 4 to 5 chromato- 

 phores; straight, or making up to 1.5 turns in the cell; receptive gam- 

 etangia somewhat inflated; zygospores eUipsoid, 63-70JU. x 100-120^; 

 median wall brown, finely corrugate and granulate. (PI. XL, Fig. 6.) 

 United States: Wisconsin, Vilas County. 



6. SiROGONiuM CEYLANicuM Wittrock 1889. WittFock and Nord- 



stedt Algae Exsiccatae, No. 358. 



Vegetative cells 69-75 /a ^ 1 40-300 /x; 7 chromatophores, nearly 

 straight; conjugation direct between reflexed gametangia; receptive 

 gametangia inflated, 120-165/^ x 135-300/1; zygospores ellipsoid, 100- 

 iiOju. X 135-195/i.; median spore wall thick, yellow-brown with minute 

 shallow depressions that have no distinct edges but are easily seen 

 when viewed edgewise. 



Ceylon. 



7. SiROGONiuM vENTERSicuM Transcau 1934. Trans. Amer. 



Micros. Soc. 53, p, 229. 



Vegetative cells 65-72 /j. x i i 0-250 /x; 5 to 8 chromatophores, straight, 

 or making i turn; conjugation direct; receptive gametangia inflated to 

 ioo-140/i; spores mostly ellipsoid, rarely somewhat ovoid, 80-90/x x 

 133-152/4; median spore wall brown, densely and irregularly verrucose. 

 (PI. XL, Fig. 7.) 



South Africa, Transvaal, Ventersdorp. 



8. SiROGONiuM MELANospoRUM (Randhawa) Transeau 1944. 



Ohio Jour. Sci. 44, p. 243. Proc. Indiaji Acad. Sci. 8, 

 p. 364. 1938. 



Vegetative cells 70-90/1 x 140-260 /x, each with 6 to 9 nearly 

 straight chromatophores; conjugation direct; receptive gametangia in- 

 flated up to 120-166 /x; zygospores usually ellipsoid, go-iio/i x 140-160 /t; 

 median spore wall brown to black, verrucose. (Pi. XL, Fig. 8.) 



