68 



ILLINOIS STATE GEOLOGICAL SURVEY 



(macerations 136, 153), "Merom" (macera- 

 tion 146), "Watson" (maceration 148), "Di- 

 vide" (maceration 811), "Woodbury" 

 (maceration 703) , and "Bogota" (macera- 

 tion 133) Coals. Out of twelve instances in 

 which the coal was sampled in two or more 

 portions, these seed membranes are present 

 only, or are more abundant, in the lower 

 samples of ten of the coals. 



Both resin rodlets and resin blebs are 

 common in some coal beds, generally but 

 not necessarily most abundant in those sam- 

 ples containing abundant Monoletes pre- 

 pollen. Resin blebs may be isodiametric to 

 lenticular, but do not generally show the 

 "stalk" illustrated in figure 3. Resin blebs 

 are easily mistaken for Monoletes prepollen 

 under low power binocular microscope. 



Miscellaneous Plant Microfossils 

 Plate 16, figures 3-9 



At least half of the maceration residue of 

 the Reynoldsburg Coal contains a distinc- 

 tive type of cuticle (pi. 16, fig. 7) . The 

 cuticles are especially reminiscent of the 

 Lepidodendron cuticle illustrated by Bart- 

 lett (1929, especially pis. XIX, XX, XXI) . 

 He describes small cuticular crests, several 

 of which may occur within a single cell out- 

 line as in the case of the areolar dome cells 

 (pi. 16, fig. 7) , and other crests up to thirty 

 times as long as a single cell. Athough 

 most abundant in the Reynoldsburg Coal 

 (maceration 618), this type of cuticle also 

 has been seen in the lowest Caseyville coal 

 in a diamond drill core (maceration 798) , 

 in "Makanda" (maceration 142) , Rock Is- 

 land (No. 1) (maceration 929) , and Col- 

 chester (No. 2) (maceration 603A) Coals. 

 It also occurs in the Pinnick (maceration 

 150) and Cannelton (maceration 780) 

 Coals in Indiana. 



The cuticle illustrated in figure 4 on 

 plate 16 shows an arrangement of stoma ta 

 in parallel rows. This arrangement has 

 been noted in cuticles from several samples 

 of Murphysboro Coal. Cuticular fragments 

 such as are illustrated by figures 5 and 6 on 

 plate 16 also occur in Tradewater Coals. 

 The original cells were radially arranged 

 around the circular openings, becoming 

 more regularly six-sided away from the 

 openings. 



Many macerations contain vascular frag- 

 ments showing various types of structures 

 (pi. 16, figs. 8, 9) . Medullary rays are illus- 

 trated by figure 8 on plate 16. The pit 

 mouths on this fragment are narrow, about 

 1 /a in length, and crossed. 



Animal (?) Membranes 



Plate 16, figures 10,11 



Membranes that may be animal in origin 

 occur in several coals, such as the coal in 

 the Bethel (Mooretown) Formation, the 

 Tarter, and the lowest Caseyville age coal 



Text fig. 6. — Macerated coal samples examined for 

 this report came from the counties shaded above. 



