EARLY PENNSYLVANIA FLORA FROM WEST-CENTRAL ILLINOIS 



35 



TABLE 6— MEASUREMENTS OF PLATYSPERMIC SEEDS OBSERVED 

 IN THE SPENCER FARM FLORA 











Nucellus 



Overall 



Sarcotesta 









Accession 



width 



length 



width 



length 



width 









no. 



(mm) 



(mm) 



(mm) 



(mm) 



(mm) 









416365 



12 



9 



26 



20 



7 





Sp. 



A < 



416361 



12 



12 



33 



25 



10 









416463 



14 

 20 



13 



25 



30 



40 



— 



J 

 S 



416468 



5 



Sp. 



B «< 



416469 



16 



22? 



22? 



40? 



3 



CO 







416364 



14? 

 11 



11 



16? 

 17 



19 



— 





416462 



3 





Sp. 



C < 



416494 



11 

 8 



12 

 8 



16 

 9 



18 

 15 



2 









416610 



0.5 





Sp. 



A < 



416467 



11 



10 



13 



23 



1 



CO 







416522 



5 



7.5 



6 



12 



0.5 



&t 







^_ 



5 



5 



6 



7 







416134 



0.5 









416362 



5 



6 



6 



7.5 



0.5 







Sp. 



B < 



416611 



5 



4.5 



6 



7 



0.5 









416300 



6 



7 



— 



— 



— 









416363 



4.5 



6 



— 



— 



— 



en 



O 



CD -H 







416465 



12 



13 









h a) < 







416612 



12 



10 









rH a 

 .CD 3 







416360 



11 



9 









•H 







416489 



9 



9 



















(sclerotesta ?) separates the nucellus from the wing, or sarcotesta. 

 This species is similar to Cardiocarpus dilatatus Lesquereux (l88U, p. 

 806-807, pi. 110, fig. 2); in our specimens, however, the sarcotesta ap- 

 pears to possess a more acute point. In their overall shape and large 

 size, our specimens are similar to Cardiocarpon akroni Read (19^6, p. 22. 

 pi. 2, fig. 5), although the latter is slightly larger and the form of 

 the apex is not clear. 



Text fig. 12 - Fossil seeds occurring in the Spencer Farm Flora. A, Holcospermum sp, 

 B, Samaropsis sp. A. C, Samaropsis sp. B. D, Samaropsis sp. C. E, Cordaicarpus 

 sp. A. F, Cordaicarpus sp. B. G, H, lEremopteris. I, iMariopteris . Bar scales 

 are 5 mm long. 



