EARLY PENNSYLVANIAN FLORA FROM WEST-CENTRAL ILLINOIS 31 



especially specimen USNM 15025 from Tracy City, Tennessee, which was 

 identified by Lesquereux. However, the figures of S. cheathami in Les- 

 quereux (l88U) and D. White (19^3) do not compare well with our material. 



The foliage of Eusphenopteris morrowensis occurs with a small 

 seed (Lagenospermum - Nudospermum) and a Telangiopsis-li~ke male fructi- 

 fication on the same bedding planes. An organic connection between the 

 foliage and either of the fructifications could not be established in 

 any specimen, but the association suggests the possibility of a natural 

 connection. The same association of foliage and fructifications has 

 been observed in other species of Eusphenopteris (Amerom, 1975 9 fig. 7). 



There are observable similarities between the foliage of Eus- 

 phenopteris morrowensis and the reconstructed foliage of Schopfiastrum 

 decussatum (Stidd and Phillips, 1973). Even though sizes and shapes of 

 the pinnules are somewhat different, the two plants are alike in three 

 other, more important aspects. The venation pattern is identical. 

 Glands in both forms are in the same position on the lamina. The inter- 

 rupted transverse striations (= transverse inner cortical plates) are 

 present. For instance, the transverse striation is visible in the axis 

 shown in plate 11, figure 1. 



Lagenospermum sp. 

 Text fig. 11C, D; pi. 12, figs. 5, 6 



Description . — Ellipsoidal seeds, 6.25 mm long, 3.38 mm diameter. 

 Faint ridges (probably eight in all) extend along the length of the 

 seed. 



Discussion . — Three small ellipsoidal seeds are intimately as- 

 sociated with a pinna of Eusphenopteris morrowensis (specimen ISM kl6^22) 

 One of the seeds is located immediately to the left of the pinna rachis 

 and at the base of a pinnule. It is possible but not certain that it 

 is organically attached to the rachis. Two seeds are to the right of 

 the rachis, one seed partially overlapping the other and both lying upon 

 the laminar portion of the pinnule. They do not appear to be attached 

 to the frond. An isolated fourth seed agrees in all characteristics 

 with the other three. 



The form genus Lagenospermum was established for small ellip- 

 soidal seeds that appear externally similar to seeds belonging to the 

 petrifaction genus Lagenostoma but that do not preserve the morphologic 

 characteristics necessary to justify their inclusion in that genus. The 

 generic name Nudospermum has also been used for similar seeds. Nudosper- 

 mum has been considered to be the seed of Lyginopterideae as well as 

 Eusphenopterideae (data summarized by Amerom, 1975, fig. 7). The seeds 

 in the Spencer Farm Flora are only slightly larger than Nudospermum kid- 

 stoni and are therefore very similar to a seed that has been linked to 

 the genus Eusphenopteris . 



Text fig. 11 - Fossil plants from the Spencer Farm Flora. A, B, Eusphenopteris mor- 

 rowensis. C, Lagenospermum sp. shoving indications of several ribs. D, L. sp. 

 occurring with E. morrowensis. E, F, two interpretations of Telangiopsis sp. Bar 

 scales are 5 mm long, except where noted. 



