PLATE 16 



All specimens photographed with transmitted light. Color of filter, when 

 used, indicated. 



Seed membranes p. 67 



Figure 



1. Seed membrane? Length 3455 /j,. Maceration 625B slide 15, Willis 

 Coal, Gallatin County, Illinois. Scale indicated below figure, (xl5). 



2. Inner thick membrane enclosed in thin membrane, partially torn 

 away from apical region. Length 2540^. Maceration 811 slide 4, "Di- 

 vide" Coal, Jefferson County, Illinois. Scale indicated below figure, 



(X15). 



Miscellaneous plant microfossils from Illinois coals p. 68 



3. Resin bleb with spinose "stalk." Total length 835 [i. Maceration 

 599B slide 4, Rock Island (No. 1) Coal, Fulton County, Illinois. Same 

 scale as figure 4, (X50). 



4. Cuticle showing arrangement of stomata in parallel rows. Maceration 

 608 slide 2, Murphysboro Coal, Jackson County, Illinois. Red filter, 

 scale indicated below figure, (x50). 



5. Pitted cuticle. Maceration 631 slide 3, Willis (?) Coal, Gallatin County, 

 Illinois. Same scale as figure 9, (x40). 



6. Cuticle. Openings up to 46 ^ in diameter. Maceration 918 slide 1, Pope 

 Creek Coal, Mercer County, Illinois. Red filter, same scale as figure 

 9, (x40). 



7. Characteristic cuticle of the Reynoldsburg Coal. Cuticle has dome cells 

 with cuticular crests. Maceration 618 slide 5, Reynoldsburg Coal, 

 Johnson County, Illinois. Scale indicated below figure, (x25). 



8. Wood fragment with medullary rays. Pit mouths up to 10 ^ in length. 

 Maceration 525B slide 6, Wiley Coal, Fulton County, Illinois. Same 

 scale as figure 9. (x40). 



9. Fusinized wood fragment. Maceration 906 slide 6, "Makanda" Coal, 

 Jackson County, Illinois. Scale indicated to right of figure, (x40). 



Membranes of animal (?) origin p. 68 



10. More or less round openings up to 66 ^ in diameter. Membrane as a 

 whole ornamented with closely spaced depressions up to 10^ in di- 

 ameter. Maceration 798 slide 7, lowest coal in diamond drill core, 

 Caseyville Group, Wabash County, Illinois. Same scale as figure 9, 

 (x40). 



11. Membrane similar in pattern to that shown above, but thinner and 

 with smaller openings and depressions. Maceration 914 slide 7, Tarter 

 Coal, Mercer County, Illinois. Same scale as figure 9, (x40). 



[135] 



