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GRAY, L. R., and T. N. TAYLOR, 1967a, Palynology of the Schultztown Coal in western (P,s) 

 Kentucky: Am. Micros. Soc. Trans., v. 86, no. 4, p. 502-506. 



GRAY, L. R., and T. N. TAYLOR, 1967b, Morphological variation of Ahrensisporites (P,s) 

 symetricus Alpern: Am. Micros. Soc. Trans., v. 86, no. 2, p. 21*1-217. 



GRESLEY, W. S., 1901, Possible new coal plants in coal. Part 3: Am. Geologist, (P,b) 

 v. 27, p. 6-14. 



GRIFFIN, C. D., 1952, Pollen analysis of a peat deposit in Livingston County, Illi- (Pl,s) 

 nois: Butler Univ. Bot. Studies, v. 10, papers 1-10, p. 9O-99. 



GRUGER, EBERRARD, 1970, The development of the vegetation of southern Illinois (Pl,s) 

 since Late Illinoian time (preliminary report): Revue Geographie Phys. 

 et Geologie Dynam. (2), v. 12, p. 143-148. 



GRUGER, EBERHARD, 1972, Pollen and seed studies of Wisconsinan vegetation in Illi- (Pl,s) 

 nois, U.S.A.: Geol. Soc. America Bull., v. 83, p. 2715-2734. 



GUENNEL, G. K. , 1952, Fossil spores of the Alleghenian coals in Indiana: Indiana (P,s) 

 Geol. Survey Rept. Prog., no. 4, 40 p. 



GUENNEL, G. K. , 1954, An interesting megaspore species found in Indiana Block coal: (P,s) 

 Butler Univ. Bot. Studies, v. 11, papers 8-17, p. 169-177. 



GUENNEL, G. K. , 1956, Systematic methods for Paleozoic plant microf ossils: Micro- (P,s) 

 paleontology, v. 2, no. 4, p. 393-395. 



GUENNEL, G. K. , 1958, Miospore analysis of the Pottsville coals of Indiana: Indiana (P,s) 

 Geol. Survey Bull., no. 13, 101 p. 



GUENNEL, G. K. , 1963, Devonian spores in a Middle Silurian reef: Grana Palynologica, (D,s) 

 v. 4, no. 2, p. 245-261. 



GUENNEL, G. K. , and R. C. NEAVEL, 1961, Torispora securis Balme : Spore or sporan- (P,s) 

 gial wall cell?: Micropaleontology , v. 7, no. 2, p. 207-212. 



HALL, J. W. , 1952, The phloem of Heterangium americanum : Am. Midland Naturalist, (P,b) 

 v. 47, no. 3, p. 763-768. 



HALL, J. W., 1954, The genus Stephanospermum in American coal balls: Bot. Gazette, (P,b) 

 v. 115, no. 4, p. 346-360. 



HALL, J. W., 1961, Anachoropteris involuta and its attachment to a Tubicaulis type (P,b) 

 of stem from the Pennsylvanian of Iowa: Am. Jour. Botany, v. 48, no. 8, 

 p. 731-737. 



HALL, J. W., and B. M. STIDD, 1971, Ontogeny of Vesicaspora , a late Pennsylvanian (P,b,s) 

 pollen grain: Palaeontology, v. 14, p. 431-436. 



HARMS, V. L., and G. A. LEISMAN, 1961, The anatomy and morphology of certain Cor- (P,b) 

 daites leaves: Jour. Paleontology, v. 35, no. 5» P- 1041-1064. 



HARRISON, J. A., 1961 , Coal petrography applied to coking problems: Illinois Mining 

 Inst. 69th Proc, p. 18-43. 



HENBEST, 0. J., 1933a, Plant residues of Coal No. 6: Illinois Acad. Sci. Trans. (P,s) 

 (1932), v. 25, no. 4, p. 147-149. 



HENBEST, 0. J., 1933b, A study of the floras from certain Carboniferous shales of (P,c,s) 

 Illinois: Univ. Illinois M.S. thesis [Urbana ] 23 p. 



HENBEST, 0. J., 1936, Size and ornamentation of some modern and fossil lycopod (P,s) 



spores: Illinois Acad. Sci. Trans. (1935), v. 28, p. 91-92. 



HIBBERT, F. A., and D. A. EGGERT, 1965, A new calamitalean cone from the middle (P,c,s) 

 Pennsylvanian of southern Illinois: Palaeontology, v. 8, pt. 4, p. 

 681-686. 



