XXXVI] 



CYCADEOIDEA 



383 



sporophylls are the only appendages, but over the greater part 

 of the receptacle they are intermixed with a smaller number of 

 similar appendages which bear a single terminal orthotropous 

 ovule (fig. 514, s). Each ovule-bearing organ or megasporophyll 

 (seed-stalk) is surrounded by 5 6 interseminal scales, and the 

 narrow cylindrical micropylar tubes are readily distinguished 



FIG. 515. Cycadeoidea sp. Surface-view of a young ovulate strobilus showing 

 the swollen ends of interseminal scales grouped about the circular micropyles. 

 (After Wieland; x 10.) 



from the sterile sporophylls in surface-view (figs. 516, 564). The 

 seeds appear to be exalbuminous and the embryo is dicotyledonous 

 (figs. 516, 521, 523) 1 . The seeds are very small in comparison 

 with those of living Cycads. The structure of the megasporo- 

 phylls, both sterile and fertile, is described in more detail in the 

 account of Cycadeoidea Morierei and other forms. Fig. 516 repre- 

 sents a longitudinal section of one of the smallest seeds of Cyca- 

 deoidea, between 3 and 4 mm. long; an embryo occupies the 

 1 See also Wieland (II 2 ) p. 152, fig. 9. 



