PLATE 8 



All specimens photographed with transmitted light, unless otherwise indi- 

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



Triletes rotatus Bartlett p. 32 



Figure 



1 . Detail of flange showing short, thornlike projections on rim of flange. 

 Maceration 910 slide 2, coal in Cascyville Group, Pope County, Illinois. 

 Red filter, scale indicated below figure, (XlOO). 



2. Broken proximo-distal compression. Maximum dimension 1465 fi. 

 Maceration 910 slide 2, coal in Caseyville Group, Pope County, Illi- 

 nois. Red filter, scale indicated below figure, (x40). 



Triletes ramosus Arnold p. 33 



3a. Proximal view. Contact areas ornamented with scattered tubercles. 

 Total diameter 1590 u. Maceration 625A 2 slide 2, Willis Coal, Gallatin 

 County, Illinois. Reflected light, scale indicated below figure, (x20). 



3b. Same spore. Distal view showing ornamentation over entire distal sur- 

 face. Reflected light, scale indicated above figure, (x20). 



4a. Proximo-distal compression. Flange elements closely spaced. Maximum 

 dimension 1600^. Maceration 625Aj slide 12, Willis Coal, Gallatin 

 County, Illinois. Red filter, same scale as figure 2, (x40). 



4b. Same spore. Detail of marginal projections of flange. Red filter, same 

 scale as figure 1, (X100). 



5. Oblique compression. Flange elements not as closely spaced as on spore 

 shown in figure 4. Maximum dimension 1600^. Maceration 625Aj slide 

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

 figure 2, (x40). 



G. Detail of flange with longer marginal projections. Projections up to 

 103 ,u in length. Maceration 626 slide 4, Rock Island (No. 1) Coal, 

 Henry County, Illinois. Red filter, same scale as figure 1, (X100). 



Triletes superbus Bartlett p. 31 



7. Rare example of laterally compressed specimen. Thin processes present 

 on contact areas, apparently absent on distal surface. Maceration 

 625Aj slide 4, Willis Coal, Gallatin County, Illinois. Reflected light, 

 same scale as figures 3a, 3b, (x20). 



8. Distal view of proximo-distal compression showing completely orna- 

 mented distal surface. Most of flange broken away. Spore body di- 

 ameter 1830 fi. Maceration 906 slide 1, "Makanda" Coal, Jackson 

 County, Illinois. Reflected light, same scale as figures 3a, 3b, (x20). 



[119 



