MIDDLE DEVONIAN COAL IN ILLINOIS 



19 



TABLE 3 - OCCURRENCE OF PLANT MICROFOSSILS IN THE THREE MACERATIONS 

 STUDIED AND DISTRIBUTION (IN PERCENT) OF PLANT MICROFOSSILS IN MACERATION 1510. 



Spore taxa 



Macerations 



1510 



1548 



1589 



Punctatisporites solidus 



+ 

 + 



+ 

 + 



7 



14 



+ 



8 



21 



2 



13 



+ 



5 

 10 



+ 

 + 



16 



+ 

 + 

 + 

 + 



4 



+ 



+ 

 X 

 X 



X 



X* 



X 



X 



X 

 X 



X 



X 



X 

 X 

 X 



X 



+ 



X 



X 

 X 



X 

 X 



P. glaber 

 P. cf. irrasus 

 P. aerarius 

 JP. sp. 

 Calamospora atava 



Retusotriletes cf. simplex 



R. tenerimedium 



R. obscurus 



R. striatus 



R.. sp. 



Apiculatasporites wapsipiniconensis 



A. davenportensis 

 A. dewittensis 

 Acanthotriletes cf. polyganius 



A. uncatus 

 Emphanisporites rotatus 



Lycospora pseudomagnif ica 



Lycospora sp. 



Spelaeotriletes sp. 



Spinozonotriletes cf. tuberculatus 



S. cf. naumovii 



S_. sp. 



Archaeozonotriletes cf. purus 



A_. sp. 

 Rhabdosporites langi 



Ancyrospora sp. 



Retialetes sp. 



Tasmanites huronensis 



Leiosphaeridia 



Veryhachium octoaster 



algae (?) 



+ = 



less than .1 percent 

 percent not determined 



yielded the largest diversity, whereas the assemblage with the poorest preserva- 

 tion and the least number of spores was found in maceration 15 89 of Sample no. 3. 

 Specimens of Acanthotriletes and Apicu lata s porite s show considerable corrosion 

 and are sometimes difficult to distinguish from the circular bodies classified as 

 algae (?). These latter forms were plentiful in all three macerations. A frequency 

 distribution of the taxa in maceration 1510 reveals that Apiculatasporites , which 

 accounts for 31 percent of the spore flora, is the dominant genus followed by 

 Retusotriletes , with 21 percent, and Spinozonotriletes , with 16 percent. Lyco- 

 spora (10 percent), Emphanisporites (5 percent), and Rhabdosporites (4 percent) 

 are well represented. 



