DEVELOPMENT OF PALEOBOTANY IN THE ILLINOIS BASIN 59 



DARRAH, W. C, 194 la, The coenopterid ferns in American coal balls: Am. Midland (P,b) 

 Naturalist, v. 25, no. 2, p. 233-269. 



DARRAH, W. C, 194 lb, Studies of American coal balls: Am. Jour. Sci., v. 239, no. (P,b) 

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DARRAH, W. C, 1969, A critical review of the Upper Pennsylvanian floras of eastern (P,c,b) 

 United States with notes on the Mazon Creek flora of Illinois: Privately- 

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DAVIS, BILL, and G. A. LEISMAN, 1962, Further observations on Sporocarpon and allied (P,b) 

 genera: Torrey Bot. Club Bull., v. 89, no. 2, p. 97-IO9. 



DAWSON, G. M. , I885, Boulder-clays. On the microscopic structure of certain boulder (D,Pl,s) 

 clays and the organisms contained in them: Chicago Acad. Sci. Bull., v. 

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DEEVERS, C. L. , 1937, Structure of Paleozoic seeds of the Trigonocarpales: Bot. (P,b) 

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DELEVORYAS, THEODORE, 1955a, The Medullosae — structure and relationships: Palaeon- (P,b) 

 tographica, Abt. B, v. 97, nos. 3, 6, p. 114-167. 



DELEVORYAS, THEODORE, 1955b, A Palaeostachya from the Pennsylvanian of Kansas: Am. (P,b,s) 

 Jour. Botany, v. 42, no. 6, p. 481-488. 



DELEVORYAS, THEODORE, 1956, The shoot apex of Callistophyton poroxyloides : Univ. (P,b) 

 Michigan Mus. Paleontology Contrib., v. 12, no. 15, p. 285-299. 



DELEVORYAS, THEODORE, 1957, Anatomy of Sigillaria approximata : Am. Jour. Botany, (P,b) 

 v. 44, no. 8, p. 654-660. 



DELEVORYAS, THEODORE, 1958, A fossil stem apex from the Pennsylvanian of Illinois: (P,b) 

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DELEVORYAS, THEODORE, 1964a, A probable pteridosperm microsporangiate fructification (P,c,s) 

 from the Pennsylvanian of Illinois: Palaeontology, v. 7, pt. 1, p. 6O-63. 



DELEVORYAS, THEODORE, 1964b, Ontogenetic studies of fossil plants: Phytomorphology, (P,b) 

 v. 14, no. 2, p. 299-314. 



DELEVORYAS, THEODORE, I967, Further remarks on the ontogeny of certain Carbonifer- (P,b) 

 ous plants: Phytomorphology, v. 17, nos. 1, 2, 3, 4, p. 330-336. 



DELEVORYAS, THEODORE, and E. J. MORGAN, 1952, Tubicaulis multiscalarif ormis— a new 

 American coenopterid: Am. Jour. Botany, v. 39, no. 3, p. 160-166. 



DELEVORYAS , THEODORE , and E. J. MORGAN, 1954a, A further investigation of the mor- (P,b) 

 phology of Anachoropteris clavata : Am. Jour. Botany, v. 41, no. 3, 

 p. 192-198. 



DELEVORYAS, THEODORE, and E. J. MORGAN, 1954b, A new pteridosperm from Upper Pennsyl- (P,b) 

 vailian deposits of North America: Palaeontographica, Abt. B, v. 96, nos. 

 1, 2, p. 12-23. 



DELEVORYAS, THEODORE, and E. J. MORGAN, 1954c, Observations on petiolar branching (P,b) 

 and foliage of an American Botryopteris : Am. Midland Naturalist, v. 52, 

 p. 37^-387. 



DENNIS, R. L. , 1968a, A developmental study of roots of presumed seed fern origin (P,b) 

 from the upper Pennsylvanian of Illinois: Illinois Acad. Sci. Trans. 

 (1968), v. 61, no. 2, p. 146-156. 



DENNIS, R. L., 1968b, Rhabdoxylon americanum sp. nov., a structurally simple fern- (P,b) 

 like plant from the upper Pennsylvanian of Illinois: Am. Jour. Botany, 

 v. 55, P. 989-995. 



