PALEOBOTANY BERRY. 



345 



7c 7d 8 9 



Fig. 16.— Fructifications of the Cycadeoidales.- 



1. Restoration of an unexpanded fructification of Cycadeoidea (after Wieland). 



2. Embryo of Cycadeoidea showing vascular bundles (after Wieland). 



3* Median longitudinal section of ovulate strobilus of Cycadeoidea (after Wieland): 



m, pith; x, xylem; p, phloem; c, cortex; a, insertion of leaf; b, bracts; s, seeds; 1, leaves; d, collar for in- 

 sertion of mierosporangiate disk. 

 4. Restoration of complete and partially expanded fructification of Cycadeoidea (after V, leland). 

 5* Section of seed and adjacent interseminal scales of Cycadeoidea turrita (after Wieland): 



is interseminal scales; s, pedicle of seed; e, embryo; r, megaspore membrane; n, nucellar sac; t, inner 

 layer of testa; p, exterior layer of testa "blow off"; m, micropylar opening and canal; b, chalaza. 

 6. Section of seed and adjacent interseminal scales of Cycadeoidea morierei (after Lignier): 



a arche^onia ?; e, pollen chamber; t and tl, inner and outer testa; o, peduncle. 

 7a b'c d Diagrammatical restoration of fructification of Cycadeoidea colossalis (after Wieland): 

 ' A transverse section above the receptacle showing the bracts (black), a petiole with vascular bundles 

 ramenta and (1-10) the wings of the microsporophylls. B, C, longitudinal section of flower showing 

 the receptacle with the small megasporophylls, the staminate disc with winged microsporophylls 

 and s-nangia, and the terminal brush of interseminal scales (indicated by the arrow m B). The 

 megasporophvlls and synangia are represented larger than the actual size. D, this shows on one 

 side the dome-like arrangement cf the microsporophylls and, on the right, a microsporophy 1 in side- 

 view. E, longitudinal section as far as the plane T surmounted by the apex of the collection of 

 microsporophylls, c; s, microsporophy 11 with synangia; A, recurved apex of microsporophyll; B, 

 bracts; D, insertion of disc; X, outer bracts riext the petiole bases. 

 8 Longitudinal section of synangium of Cycadeoidea dacotensis (after Wieland). 



9. Transverse section of a partially emergent but still folded frond of Cycadeoidea mgens deeply imbedded 

 in ramentum (after Wieland). 



