PLATE 4 



All specimens photographed with transmitted light, unless otherwise indi- 

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



Triletes globosus Arnold var. (A) p. 43 



Figure 



1. Proximo-distal compression. Radiating ridges vaguely developed on 

 contact areas. Diameter 480 /x. Maceration 810 slide 12, coal in the 

 Hardinsburg Formation, Crittenden County, Kentucky. Reflected 

 light, scale indicated below figure, (x50). 



2. Characteristic proximo-distal compression. Diameter 495 /x. Macera- 

 tion 810 slide 2, coal in the Hardinsburg Formation, Crittenden 

 County, Kentucky. Red filter, same scale as figure 6, (xlOO). 



3. Maximum spine development observed. Spines up to 22 /x in length. 

 Maceration 810 slide 7, coal in the Hardinsburg Formation, Critten- 

 den County, Kentucky. Green filter, scale indicated below figure, 



(X150). 



Triletes globosus Arnold var. (B) p. 44 



4. Lateral half of spore showing spinose contact area and lips. Total 

 length 420^. Maceration 798 slide 12B, lowest coal in diamond drill 

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

 as figure 6, (xlOO). 



5. Proximo-distal compression. Maximum dimension 570 /x. Maceration 

 798 slide 3, lowest coal in diamond drill core, Caseyville Group, Wa- 

 bash County, Illinois. Reflected light, same scale as figure 1, (x50). 



6. Proximo-distal compression. Characteristic development of distal 

 ornamentation and flange. Maximum diameter 555 /x. Maceration 798 

 slide 11, lowest coal in diamond drill core, Caseyville Group, Wabash 

 County, Illinois. Red filter, scale indicated below figure, (xlOO). 



7. Proximo-distal compression, apparently abraded. Maximum dimen- 

 sion 470 ix. Maceration 796 slide 7, coal in Caseyville Group, Wabash 

 County, Illinois. Red filter, same scale as figure 6, (xlOO). 



8. Detail of spines. Maceration 798 slide 2RMK, lowest coal in diamond 

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

 scale as figure 3, (xl50). 



9. Extreme development of distal ornamentation. Spines up to 57 /x in 

 length. Maceration 798 slide 1RMK, lowest coal in diamond drill core, 

 Caseyville Group, Wabash County, Illinois. Green filter, same scale as 

 figure 3, (xl50). 



10. Same spore. More or less solid flange, folded over in part, up to 53 /x 

 in width. Green filter, same scale as figure 3, (xl50). 



Triletes globosus Arnold var. (C) p. 45 



11. Characteristic proximo-distal compression. Maximum diameter 685^. 

 Maceration 631 slide 1, Willis (?) Coal, Gallatin County, Illinois. Re- 

 flected light, same scale as figure 1, (x50). 



12. Detail of ornamentation. Tubercles up to 23^ in diameter. Macera- 

 tion 625A 1} slide 14, Willis Coal, Gallatin County, Illinois. Red filter, 

 same scale as figure 3, (xl50). 



[in] 



