Illinois State Geological Survey 



Report of Investigations No. 91 — Plate 3 



Lycospora 



I Laevigato-sp|)rites 

 Granulati-sporites | poO/^ 



20. 



Reinschospora i 

 =1 Denso-sporites3Q'o 

 Triquitrites | 

 =1 Prtyosporites 

 Raistrickia I 



3 Reticulati- 



30^ 



Punctati -spontes | | 

 1 + Cirratriradites 



40Q^ 

 I 50,0^ 

 sporites 



I mm. 



700y^ 



Approximate Size -Range 

 WITHIN "Spore" genera 



2 mm. 



1000/^ 



Fforinites J 

 Endosporiies 



Calamospora 



40 



'/^ 



Alisporites | 

 =1 Alati- sporites 



3 mm. 



200(>^ 



bOyu 

 60/. 



Tasmanites 



Monoletes 



75^ 



\00yu, 150^200/^300/^ 



Parasporites 

 Zonalo-sporitfes 



4 mm. 



6mnx 



Triletes 



10 mm. 



I (abortive) I 



I II (fertile) | 



Cystosporites 



