ii8 ZYGNEMATACEAE 



Descriptions ok Species 



1. Temnogametum uleanum (Mobius) Wille 1909. Pflanzen- 



familien, 'Nachtrage zum 1 Teil, 2 abt., p. 13, Fig. 3. 

 Mobius. Hedwigia. 34, p. 175, PI. 2, Figs. i-io. 1895. 



Vegetative cells io-12/x x 60-120/x, with an axile chromatophore 

 with about 4 pyrenoids, cell sap purple; cells elongating to 20-25 diam- 

 eters at time of conjugation; conjugation usually lateral, sometimes 

 scalariform; gametangia 20-30 /a long; zygospores by lateral conjuga- 

 tion obliquely ovoid, 20-40^1 x 40-60 /x; zygospores by scalariform con- 

 jugation quadrangular with truncate angles, 25-40 ju. x 30-50 m; spore 

 walls transparent and smooth. Aplanospores rare but present. (PI. XX, 

 Figs. 1-4.) 



Brazil, near Itajahi, March, 1894 (E. Ule Coll.). 



2. Temnogametum heterosporum W. & G. S. West 1897. ]our. 



Bot. 35, p. 37, PL 370, Figs. 5-9. 



Vegetative cells i^-iyiJ- x 90-200^1; chromatophores with 2-6 pyre- 

 noids, color of cell sap unknown; conjugation scalariform and lateral; 

 gametangia 22-40 jw in length; zygospores by scalariform conjugation 

 quadrangular with concave sides, 39-50 /a x 48-59 m; zygospores by lat- 

 eral conjugation obliquely ovoid, 20-26 ^ x 61-67 ju spore wall smooth, 

 transparent. (PI. XX, Fig. 10.) 



Africa, Angola, Morro de Lopollo, February, i860 (Welwitsch Coll.). 



3. Temnogametum transeaui Prescott 1947. Ohio Jour. Sci. 47, 



p. 132. 



Vegetative cells 14-20^ x 100-400^, with a narrow, axial chroma- 

 tophore with 2-4 pyrenoids in a row; conjugation lateral and scalar- 

 iform; gametangia, 20-22 m x 20-30;", at the ends of vegetative cells; 

 zygospores by lateral conjugation obliquely ovoid, 35-42 yu. x 80-100 /x; 

 zygospores by scalariform conjugation, 40-50 iu, x 45-60 /x; median wall 

 smooth, orange-brown at maturity. (PI. XX, Figs. 5-6.) 



Ecuador, volcano Cotopaxi, hanging bog at 14,000 feet. 



4. Temnogametum thaxteri Transeau 1932. Ohio Jour. Sci. 32, 



p. 489, PI. I, Figs. 14-20. 

 Vegetative cells 39-45 /^ x 220-360 m; chromatophore broad with 

 30-120 pyrenoids scattered throughout; conjugation scalariform; gam- 

 etangia 36-90 /x long; zygospores c|uadrangular-ovoid, 60-75;^ x 90-120 /u, 

 occasionally in pairs which are somewhat longer and narrower; lateral 

 walls concave; aplanospores tumid, about 60 m x 75 m- (PI- XX, Figs. 



7-9-) 



Trinidad, Cumuto Station, April 10, 1913 (Thaxter Coll.). 

 The cell sap in this species is purple. 



