38 



lustrated spores from a sphenopsid cone, 

 Litostrobus iowensis Mamay, 1954, that are 

 analogous to Reticulatis pontes. 



Reticulatis pontes reticulatus (Ibrahim) 

 Ibrahim, 1933 



The single specimen of Reticulatis pontes 

 reticulatus found in maceration 1175-1 is very 

 similar to the holotype illustrated by Ibrahim 

 (1933) and by Potonie and Kremp (1955, 

 fig. 310). 



Reticulatis pontes sp. 1 

 Plate 6, figure 5 



The spore is radial, trilete, and subcircular 

 in outline, and has an irregular margin. The 

 rays are straight and extend to the margin of 

 the coarsely reticulate spore coat. Polar areas 

 are darker and thicker than the rest of the 

 spore coat. The muri are sinuous, 3 to 4.5 /x 

 wide and about 3 /x high. Eighteen muri ex- 

 tend beyond the spore margin. Lacunae are 

 15 to 20 /x wide. Reticulatis pontes sp. 1 is 

 similar to R. reticulatus, but the former has 

 longer rays and more numerous muri. 



Figured specimen. — Negative 5945; Trivoli 

 Gyclothem, maceration 1175-1, slide 10, co- 

 ordinates, 136.2 X 39.1; size, 81.0 by 79.4 /*. 



Reticulatis pontes sp. 2 

 Plate 6, figure 6 



The spores are subcircular in outline. No 

 haptotypic features were observed. The re- 

 ticulate spore coat has muri 2 to 3 xi wide, 

 and lacunae about 4.5 /x in diameter. 



Figured specimen. — Negative 6024; Trivoli 

 Cyclothem, maceration 1175-D, slide 8, co- 

 ordinates, 122.4 x 39.4; size, 52.3 by 48.7 /x. 

 This species was also found in maceration 

 1175-C. 



Genus Rhizomaspora Wilson, 1962 



Type species. — Rhizomaspora radiata Wil- 

 son, 1962. 



Affinity. — Unknown. 



Rhizomaspora cf. radiata Wilson, 1962 

 Plate 6, figure 7 



The pollen grain is bilateral and bisaccate. 

 The body, subcircular in outline, is covered 



with ribs radiating outward from the polar 

 region to the body margin. The bladders are 

 externally levigate and internally reticulate 

 (lacunae 1 to 2 /x in diameter) . The speci- 

 men observed in this study is considerably 

 smaller than the specimens of Rhizomaspora 

 radiata (140 to 170 xt long) described by 

 Wilson (1962, p. 20). 



Figured specimen. — Negative 5812; Fithian 

 Cyclothem, maceration 1170-G, slide 8, co- 

 ordinates, 125.2 X 41.5; size, total 93.7 by 

 60.8 fx, body 44.4 by 42.2 /x. 



Genus Savitrisporites? Bhardwaj, 1955 



Type species. — Savitrisporites triangulus 

 Bhardwaj, 1955. 



Affinity. — Unknown. 



Savitrisporites? sp. 1 

 Plate 6, figure 8 



The spore is radial, trilete, and has an ir- 

 regular, triangular outline. Corners opposite 

 the rays are slightly thickened. The rays are 

 distinct and extend to the inner margin of 

 the well defined, thickened, equatorial zone, 

 which is 6 to 7 xi wide. The distal surface 

 of the spore coat is covered with low spines 

 that are joined to form an irregular re- 

 ticulum. 



Figured specimen. — Negative 5897; Trivoli 

 Cyclothem, maceration 1175-P, slide 8, co- 

 ordinates, 142.0 x 51.2; size, 62.7 by 60.8 /x. 



Genus Secarisporites Neves, 1961 

 Plate 6, figures 9-12 



Type species. — Secarisporites lobatus Neves, 

 1961. 



Affinity. — Unknown. 



Secarisporites crenatus sp. nov. 

 Plate 6, figures 9-12 



Diagnosis. — The spores are radial, trilete, 

 roundly triangular to subcircular in outline, 

 and in good proximal-distal orientation. The 

 distinct trilete rays and commissure are torn, 

 contorted, and extend as far as the inner 

 margin of the thickened equatorial zone or 

 occasionally part way into it. The poorly de- 



