﻿OVULATE CONES. 



I I I 



scales are necessarily cut more and more apically, each transverse section of a frait 

 being, with respect to these organs, for all ordinary purposes of observation, the 

 equivalent of a set of serial sections of a single seed pedicel and its surrounding 

 interseminal scales throughout all but their basal portion. Likewise, interiorly to 

 the more or less complete rows of seeds various seed bases are cut, and exteriorly 

 micropylar tubes, at varying heights and degrees of obliquity, as clearly appears in 

 figure 60 A, from another species than the present. In the seed zone the intersemi- 

 nal scales are very much flattened, but, as already seen, the extreme periphery of the 



T.77. xf. 



S.S/o 



■Z/f.SSf 



Fig. 57. — Surface pattern and sculpturing of ovulate cones of Cycadeoidea. 



1-3 



4. 



4. On the cone itself the division lines are of fight 

 T. 61 — C. dacotensis (?). It is to be 



Surface pattern of a nearly full-sized ovulate strobilus of C. Wielandi. T. 77. 

 quartz with the silcified scale tips nearly black 

 Surface sculpturing of a much younger fruit of a different species from the preceding. X 10. 

 noted that the interseminal scale tips are relatively small. 



5. C. dacotensis. Surface sculpturing of ovulate cone shown in 6. as seen in a thin tangential section cut with a few ramental scales lying over 



the surface of the cone and embedded in neatly clear silica. (S. 510, Fr. V, T. 214.) X 10. 



6. C. dacotensis. Portion of transverse section II of Fruit V of T. 214. Enlarged six times to show granular replacement of most of the 



seed zone O), with preservation of the obliquely-cut micropylar tubes ( "0. Bracts stippled. 



fruit is composed of their expanded tetragonal or pentagonal shaped summits and 

 the rounded micropylar tubes. The summits of the interseminal scales form, as it 

 were, a continuous envelope or pericarp, through which project the tips of the long 

 micropylar tubes of the embedded seeds. The transverse sections cut beneath the 

 lowermost seeds exhibit the highly characteristic appearance shown in the diagram- 

 matic figure 58 and the corresponding photographs of plate XXVI. Enveloping 



