ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 500 



TABLE 1— SPECIES FOUND IN THE SPENCER FARM FLORA IN 

 BROWN COUNTY, ILLINOIS 



LYCOPSIDS 



SPHENOPSIDS 



FERNS 



NOEGGERATHIALES 



PTERIDOSPERMS 



CORDAITALES 



PROBLKMATICA 



Page 

 6 



Lepidodendron wortheni 



Annularia cf. vernensis 

 Annular ia cf. asteris 

 Asterophyllites longifolius 

 Asterophyllites cf. equisetiformis 

 Mesocalamites cf. cistiiformis 

 Calamostachys andanensis 



Alloiopteris gracillima 

 Alloiopteris cf . quercifolia 

 Dactylotheca aspera 



Lacoea seriata 

 Palaeopteridium reussii 

 Gulpenia limburgensis 



Megalopteris dawsoni 

 Megalopteris ovata 

 Lesleya cheimarosa spec. nov. 

 Alethopteris lonchitica 

 Sphenopteris preslesensis 

 Eusphenopteris morrowensis comb 

 Lagenospermum sp . 

 Telangiopsis sp . 



Rhodeopteridium phillipsii spec 

 Holcospermum sp. 



Cordaites cf. principalis 

 Samaropsis sp . A 

 Samaropsis sp. B 

 Samaropsis sp . C 

 Cordaicarpus sp. A 

 Cordaicarpus sp. B 



cf. Mariopteris 

 cf. Eremopteris 



11 



14 



21 



33 



37 



rare in other floras. Flora similar to the Spencer Farm was first ob- 

 served in western Illinois by White (1908), who gave a preliminary list 

 including the nomen nudum "Lacoeia." White (l93l) suggested that this 

 flora grew on the limestone plains of western Illinois. Leary (1973) re- 

 ported on the systematic position and reconstruction of Lacoea. 



