PLATE 5 



All specimens photographed with transmitted light, unless otherwise indi- 

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



Triletes globosus Arnold p. 42 



Figure 



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

 on contact areas. Diameter 545 /a. Maceration 618 slide 2, Reynoldsburg 

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

 figure, (X50). 



2. Detail of rather stout spines. Maceration 909 slide 9, Battery Rock 

 Coal, Pope County, Illinois. Red filter, same scale as figures 3, 5, 

 (X150). 



3. Detail of spines. Maceration 618 slide 6, Reynoldsburg Coal, Johnson 

 County, Illinois. Red filter, scale indicated below figure, (xl50). 



4. Fragment showing lips, torn apical prominence, and ornamentation 

 of contact area and distal surface. Maceration 909 slide 5, Battery 

 Rock Coal, Pope County, Illinois. Red filter, scale indicated below 

 figure, (xlOO). 



5. Deeply cleft spines up to 41 ^ in length. Maceration 906 slide 5, 

 "Makanda" Coal, Jackson County, Illinois. Green filter, scale indicated 

 above figure, (X150). 



6. Detail of ornamentation. Maceration 929 slide 6, Rock Island (No. 1) 

 Coal, McDonough County, Illinois. Green filter, same scale as figures 

 3, 5, (X150). 



Triletes cf. T. hirsutus (Loose) Schopf, Wilson, and Ben tall p. 45 



7. Detail of characteristic ornamentation. Maceration 929 slide 6, Rock 

 Island (No. 1) Coal, McDonough County, Illinois. Green filter, same 

 scale as figures 3, 5, (xl50). 



Triletes splendidus (Zerndt) Schopf, Wilson, and Bentall p. 27 



8. Broken lateral compression showing pyramidal apical prominence and 

 stout distal spines. Total dimension, including spines, 1370 y^c. Macera- 

 tion 200 slide 1 XXV, in Degonia Formation, Pope County, Illinois. 

 Reflected light, same scale as figures 9a, 9b, (x30). 



Triletes praetextus Zerndt p. 46 



9a. Oblique compression showing prominent apical prominence and ridges 

 parallel to the rays. Equatorial dimension 1160yu. Maceration 587 

 slide 1, Battery Rock Coal, Hardin County, Illinois. Reflected light, 

 scale indicated below figure, (x30). 

 9b. Same spore. View of other side showing the restriction of ornamenta- 

 tion to a zone around the equator. Reflected light, scale indicated 

 above figure, (x30). 

 10. Detail of the equatorial ornamentation showing the characteristic 

 branching of the spines. Maceration 587 slide 3, Battery Rock Coal, 

 Hardin County, Illinois. Red filter, same scale as figures 3, 5, (xl50). 



112] 



