PLATE 9 



All specimens photographed with transmitted light, unless otherwise indi- 

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



Triletes superbus Bartlett p. 31 



Figure 



1. Fragment of flange 1175^ in width. Maceration 906 slide 3, "Ma- 

 kanda" Coal, Jackson County, Illinois. Same scale as figure 2, (x40). 



2. Typically fenestrate flange showing delicate nature of some of the 

 flange elements. Width 1180>. Maceration 906KOH slide 3, "Ma- 

 kanda" Coal, Jackson County, Illinois. Red filter, scale indicated below 

 figure, (X40). 



Triletes brasserti Stach and Zerndt p. 35 



3. Tetrad. Maceration 604A slide 4, Tarter Coal, Fulton County, Illinois. 

 Reflected light, scale indicated below figure, (xlO). 



4a. Characteristic proximo-distal compression. Total diameter 1710 [x. 

 Maceration 604A slide 3, Tarter Coal, Fulton County, Illinois. Re- 

 flected light, same scale as figure 5, (x20). 



4b. Same spore. Distal view showing granulose to spongy appearance of 

 distal surface of flange. Reflected light, same scale as figure 5, (x20). 



5. Lateral compression. Part of contact surface, flange, and distal coat 

 lorn away showing thickness of flange at its juncture with trilete rays. 

 Maceration 604A slide 3, Tarter Coal, Fulton County, Illinois. Re- 

 flected light, scale indicated below figure, (x20). 



6. Proximo-distal compression with pleated flange. Total diameter 1795 p. 

 Maceration 625B slide 1, Willis Coal, Gallatin County, Illinois. Re- 

 flected light, same scale as figure 5, (x20). 



7. Small example, immature (?). Maximum dimension 990^. Maceration 

 625B slide 2, Willis Coal, Gallatin County, Illinois. Reflected light, 

 same scale as figure 5, (x20). 



8a. Oblique compression of small example with part of flange attached. 

 Inner membrane distinctly ornamented. Total diameter 925 /x. Macera- 

 tion 625 Ai slide 13, Willis Coal, Gallatin County, Illinois. Red filter, 

 scale indicated below figure, (x50). 



8b. Same spore. Detail of inner membrane. Red filter, scale indicated be- 

 low figure, (xlOO). 



9. Corner of flange torn from spore body. Distal margin of contact with 

 spore body shows as dark medial band. Width at corner 490 jx. Mac- 

 eration 625 B slide 7, Willis Coal, Gallatin County, Illinois. Red filter, 

 same scale as figure 8b, (xlOO). 

 10. Detail of flange showing imbricating platelike nature of the distal 

 surface of the solid, nonfenestrate flange. Maceration 625B slide 6, 

 Willis Coal, Gallatin County, Illinois. Red filter, same scale as figure 

 8b, (xlOO). 



[ 120 



