PLATE 11 



All specimens photographed with transmitted light, unless otherwise indi- 

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



Triletes ? corycilis n. sp p. 49 



Figure 



1. Lateral compression. Holotype. Suture slightly open. Length 1055 fi. 

 Maceration 798 slide 10, lowest coal in diamond drill core, Casey ville 

 Group, Wabash County, Illinois. Red filter, same scale as figure 6, 

 (X50). 



2. Lateral compression. Narrow frill shows at edges of one contact area. 

 Length 1110^. Maceration 798 slide 10, lowest coal in diamond drill 

 core, Caseyville Group, Wabash County, Illinois. Same scale as figure 

 6, (X50). 



3a. Broken lateral compression. Two contact areas show central scar. 

 Maximum dimension 1270 /x. Maceration 798 slide 10, lowest coal in 

 diamond drill core, Caseyville Group, Wabash County, Illinois. Same 

 scale as figure 6, (x50). 

 3b, 3c. Same spore. Details of contact areas. Scale indicated below figure 3c, 

 (x75). 



Cystosporites verrucosus Dijkstra p. 53 



4. Lateral compression of fertile spore with long distal appendage. Total 

 length 3420^. Maceration 825 slide 1, Colchester (No. 2) Coal, Schuyler 

 County, Illinois. Reflected light, scale indicated to right of figure, 

 (xl5). 



5. Lateral compression of fertile spore. Apical area characteristically 

 pleated. Small portion of distal appendage still attached. Maximum 

 dimension 2535^. Maceration 881 slide 1, Indiana Coal IV, Edgar 

 County, Illinois. Reflected light, scale indicated to left of figure, 

 (X15). 



6. Lateral compression of abortive spore. Part of spatulate apical promi- 

 nence torn away. Total length 700 fi. Maceration 916 slide 5, Pope 

 Creek Coal, Mercer County, Illinois. Red filter, scale indicated below 

 figure, (X50). 



7. Detail of spinose spore coat from fertile spore. Fibrous meshlike char- 

 acter of spore coat well developed. Maceration 916 slide 2, Pope Creek 

 Coal, Mercer County, Illinois. Scale indicated below figure, (xl50). 



8. Detail of spinose spore coat from fertile spore. Maceration 916 slide 2, 

 Pope Creek Coal, Mercer County, Illinois. Scale indicated above figure, 



(X150). 



Cystosporites giganteus (Zerndt) Schopf p. 52 



9. Oblique compression showing proximal view of relatively small con- 

 tact area. Maximum dimension 2600 fi. Maceration 825 slide 2, Col- 

 chester (No. 2) Coal, Schuyler County, Illinois. Same scale as figures 

 4, 5, (xl5). 



10. Lateral compression of fertile spore. Small abortive spore also present. 

 Total length 6210^. Maceration 943 slide 3, coal in the Bethel (Moore- 

 town) Formation, Hardin County, Kentucky. Scale indicated below 

 figure, (X10). 



[124 



