PLATE 12 



All specimens photographed with transmitted light, unless otherwise indi- 

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



Cystosporites giganteus (Zerndt) Schopf p. 52 



FlCURE 



1. Abortive spore. Maximum dimension 720 ll- Maceration 908 slide 2, 

 Battery Rock Coal, Pope County, Illinois. Reflected light, scale indi- 

 cated below figure, (x40). 



2. Apical portion of fertile spore. Abortive spore also present. Maceration 

 824 slide 2, Colchester (No. 2) Coal, Schuyler County, Illinois. Re- 

 flected light, same scale as figure 1, (x40). 



3. Detail of spore coat from middle region of fertile spore. Maximum de- 

 velopment of fibrous meshlike coat observed. Maceration 824 slide 3, 

 Colchester (No. 2) Coal, Schuyler County, Illinois. Same scale as fig- 

 ures 9b, 9c, (X150). 



4. Lateral compression of small fertile spore with distal appendage. 

 Maceration 523A slide 1, Babylon Coal, Fulton County, Illinois. Re- 

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



Cystosporites varius (Wicher) Dijkstra p. 51 



5. Lateral compression of larger abortive (?) spore. Total length 1180/4. 

 Maceration 604A slide 1, Tarter Coal, Fulton County, Illinois. Re- 

 flected light, scale indicated below figure, (x30). 



6. Proximo-distal compression of small abortive spore with prominent 

 three-lobed apical cushion. Maximum dimension 530 p. Maceration 824 

 slide 2, Colchester (No. 2) Coal, Schuyler County, Illinois. Reflected 

 light, scale indicated below figure, (x50). 



7. Detail of apical region of large abortive (?) spore. Apical cushion torn 

 away revealing open trilete suture. Maceration 625B slide 14, Willis 

 Coal, Gallatin County, Illinois. Scale indicated below figure, (xlOO). 



8. Detail of spore coat from middle region of fertile spore. Fibrous struc- 

 ture not as well developed as is usual for these spores. Maceration 824 

 slide 8, Colchester (No. 2) Coal, Schuyler County, Illinois. Same scale 

 as figures 9b, 9c, (xl50). 



Cystosporites breretonensis Schopf p. 50 



9a. Fertile and abortive spores, both possessing apical cushions and a re- 

 ticulate-appearing pattern on the spore coat. Length of fertile spore 

 3390 fi. Maceration 611 slide 1, Colchester (No. 2) Coal, Grundy Coun- 

 ty, Illinois. Scale indicated below figure, (xl5). 

 9b. Same specimen. Detail of spore coat of fertile spore in apical region 

 showing the reticulate-appearing pattern. Scale indicated below figure, 

 (X150). 

 9c. Same specimen. Detail of spore coat of abortive spore showing some- 

 what coarser reticulate pattern. Scale indicated above figure, (xl50). 



10. Abortive spore showing granulose outline of apical cushion and reticu- 

 late-appearing coat Total length 1030 it. Maceration 825 slide 3, Col- 

 chester (No. 2) Coal, Schuyler County, Illinois. Red filter, same scale 

 as figure 5, (x30). 



11. Distal view of abortive spore. Closely spaced, low prominences cause 

 the reticulate appearance of the coat. Maximum dimension 665 fx. 

 Maceration 583 slide 1, Harrisburg (No. 5) Coal, Wabash County, Illi- 

 nois. Reflected light, same scale as figure 6, (x50). 



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