PLATE 10 



All specimens photographed with transmitted light, unless otherwise indi- 

 cated. Color of filter, when used, also indicated. 



Triletes triangulatus Zerndt (sensu Dijkstra) p. 38 



Figure 

 la. Proximo-distal compression showing coarse distal reticulation. Total 



diameter 740 p. Maceration 798 slide 12 A, lowest coal in diamond drill 



core, Caseyville Group, Wabash County, Illinois. Red filter, same scale 



as figures 3, 4a, (X50). 

 lb. Same spore. Detail of ornamentation. Red filter, same scale as figure 



2b, (xl 00). 

 2a. Proximo-distal compression showing distal reticulation of a slightly 



different aspect. Total diameter 625 /*. Maceration 798 slide 15, lowest 



coal in diamond drill core, Caseyville Group, Wabash County, Illi- 

 nois. Red filter, same scale as figures 3, 4a, (x50). 

 2b. Same spore. Detail of ornamentation. Red filter, scale indicated below 



figure, (X100). 

 3. Distal view showing fine reticulation. Maceration 588 slide 2, Babylon 



Coal, Fulton County, Illinois. Reflected light, scale indicated below 



figure, (X50). 

 4a. Proximal view. Maximum dimension 685 /n. Maceration 604A slide 6, 



Tarter Coal, Fulton County, Illinois. Reflected light, scale indicated 



above figure, (x50). 

 4b. Same spore. Distal view. Reflected light, same scale as figures 3, 4a, 



(X50). 



5. Distal ornamentation in focus. Maximum dimension 595 fi. Macera- 

 tion 550 slide 2, Murphysboro Coal, Jackson County, Illinois. Red 

 filter, same scale as figures 3, 4a, (x50). 



6. Proximo-distal compression showing reticulations on flange. Macera- 

 tion 603B slide 4, Colchester (No. 2) Coal, Fulton County, Illinois. 

 Green filter, same scale as figures 3, 4a, (X50). 



7. Lateral compression showing lips, coarse distal reticulation, and ir- 

 regularly developed proximal reticulation. Maximum dimension 810^. 

 Maceration 603C slide 2, Colchester (No. 2) Coal, Fulton County, Illi- 

 nois. Red filter, same scale as figures 3, 4a, (x50). 



8. Lateral compression showing fine proximal and coarse distal reticula- 

 tions. Maceration 799B slide 1, Murphysboro Coal, Jackson County, 

 Illinois. Red filter, same scale as figures 3, 4a, (x50). 



9. Proximo-distal compression of denuded example. Inner membrane 

 characteristically ornamented. Diameter 540^. Maceration 603B slide 

 4, Colchester (No. 2) Coal, Fulton County, Illinois. Red filter, scale 

 indicated above figure, (x75). 



10. Proximal ornamentation in focus. Total diameter 680 jx. Maceration 

 599B slide 7, Rock Island (No. 1) Coal, Fulton County, Illinois. Red 

 filter, same scale as figures 3, 4a, (x50). 



Triletes ? saturnipunctatus n. sp p. 48 



11. Slightly oblique compression. Holotype. Diameter 433^. Maceration 

 916 slide 5, Pope Creek Coal, Mercer County, Illinois. Red filter, same 

 scale as figure 2b, (xl00). 



123] 



