LAEVIGATO-SPORITES 



37 



sible that some of the names given below 

 will prove to be synonyms. On the other 

 hand a number of distinct and as yet un- 

 recorded species have been recognized in 

 the Illinois basin and elsewhere. 



The list includes genotype species of 

 four previously named genera. L. bila- 

 teralis (Loose) was the only species de- 

 scribed by Loose (1934, p. 159) under 

 the new name, Reticulato-sporites. The 

 name was credited to 'Tbrahim 1932" al- 

 though no "reticulata" was ever used by 

 that author. L. desmoinensis is the gen- 

 otype of Phaseolites Wilson and Coe 

 (1940). L. minutus (Ibrahim) was the 

 sole species given under Punctato-sporites 

 by Ibrahim (1933, p. 40). L. vulgaris 

 Ibrahim is the designated genotype of 

 Laevigato-sporites Ibrahim (1933, p. 39). 

 All of these species are evidently con- 

 generic, their chief distinction being in 

 variation of surface ornament and small 

 differences of size, none of which can be 

 regarded as of more than specific impor- 

 tance. The names Reticulato-sporites, 

 Phaseolites, and Punctato-sporites are 

 therefore regarded as synonyms of Laevi- 

 gato-sporites. All these are typically rep- 

 resented by specimens from the upper 

 part of the Westphalian B and approxi- 

 mately equivalent beds in America. 



1. Laevigato-sporites bilateralis (Loose), 

 S. W. and B., comb. nov. 



Reticulato-sporites bilateralis Loose, 

 1934, Inst. Palaobot. Arb., vol. 4, no. 3, p. 

 159, pi. 7, fig. 22. 



Note. — Reticulato-sporites is a generic name 

 published only by Loose (1934) although he 

 erroneously credited it to "Ibrahim, 1932." 



2. Laevigato-sporites cranmorensis Berry, 

 1937, Am. Midland Naturalist, vol. 18, no. 

 1, p. 157, fig. 1. 



3. Laevigato-sporites desmoinensis (Wilson 

 and Coe) S. W. and B., comb. nov. 



Phaseolites desmoinensis Wilson and 

 Coe, 1940, idem, vol. 23, no. 1, p. 183, fig. 4. 



Note. — Evidently closely related to Laevigato- 

 sporites vulgaris. 



4. Laevigato-sporites minimus (Wilson and 

 Coe) S. W. and B., comb. nov. 



Phaseolites minimus Wilson and 

 Coe, 1940, idem, vol. 23, no. 1, p. 183, fig. 5. 



5. Laevigato-sporites minutus (Ibrahim) S. 

 W. and B. comb. nov. 



Punctato-sporites minutus Ibrahim, 

 1933, Sporenformen des Aegirhorizonts, p. 

 40, pi. 5, fig. Z2>. 



6. Laevigato-sporites (?) pennovalis Berry, 

 1937, Am. Midland NaturaHst, vol. 18, no. 

 1, pp. 156-7, fig. 4. 



7. Laevigato-sporites thiessenii Kosanke, 

 1943, Am. Midland Naturalist, vol. 29, no. 

 1, p. 125, pi. 3, figs. 1, la, lb. 



Pittsburgh microspore of Thiessen, various 

 publications. See especially Thiessen and Stand, 

 1923. 



8. Laevigato-sporites (?) tuberculatus 

 (Berry), S. W. and B., comb. nov. 



Tuberculati-sporites tuberculatus Berry, 

 1937, idem, vol. 18, no. 1, p. 155, fig. 9. 



9. Laevigato-sporites vulgaris (Ibrahim) 

 Ibrahim, 1933, Sporenformen des Aegirhor- 

 izonts, pp. 39-40, pi. 2, fig. 16 ; pi. 5, figs. 2>7, 

 38, 39. 



Sporonites vulgaris Ibrahim, 1932, 

 Neues Jahrb. Beilage-Band 67, Abt. B, p. 

 448, pi. 15, fig. 16. 



Laevigato-sporites vulgaris forma minor 

 Loose, 1934, Inst. Palaobot. Arb., vol. 4, 

 no. 3, p. 158, pi. 7, fig. 12. 

 Laevigato-sporites vulgaris forma maior 

 Loose, 1934, idem, p. 158, pi. 7, fig. 6. 

 Laevigato-sporites vulgaris forma max- 

 iMus Loose, 1934, idem, p. 158, pi. 7, fig. 11. 



NOMEN EXCLUDENDE 



1. Laevigato-sporites rheaensis Berry, 1937, Am. Mid- 

 land Naturalist, vol. 18, no. 1, p. 157, fig. 13. 

 Note. — The morphology of this form is so obscure that 

 its significance cannot be ascertained. 



Genus Zonalo-sporites Ibrahim, 1933 



Symmetry. — Spores apparently bilat- 

 eral, monolete. 



Shape. — Flattened elliptical ( ?), broad- 

 ly elliptical in transverse plane. 



6^i>^.— Relatively large, 200-300 mi- 

 crons in length. 



Ornamentation. — Surface smooth to 

 minutely rugose. 



Haptotypic features. — Linear proximal 

 suture with slight angular median deflec- 

 tion, termini of arcuate ridges may be 

 weakly differentiated. 



Spore coat. — Perisporal bladder mem- 

 brane thin, enveloping spore body on all 

 sides, and in contact with it proximally 

 and distally. Body wall (exospore) rela- 

 tively thick and brownish translucent. 



Affinity. — Probably pteridospermic, 

 judging from points of similarity with 

 Monoletes which is discussed later. It 

 nevertheless is still extremely problematic 

 since it superficially seems to combine 

 features of spores of Medullosan and of 

 Cordaitean relationship. 



