/''O/i'il/.S OF THE DISK 



83 



expanded until il is iiicrcly convex or even ])l;me. To all such modi- 

 fications the term (lyiiohasc is ajjplicd. Jn this con(htion it may 

 become liollowed ont at the insertion of the carpels, as in borage (Fig. 

 250). In all forms of the gynol)ase it is important to note the point 

 of attachment of the divisions of the ovary and the scars wliich the 

 latter lea\e upon removal. 



Fig. 245. Pistils of Erorliiim siiriiifziiiK away from the carpopliore (a). 24(5. l-'lower of Lychnis, 

 showing anthophore at a. 247. Carpels of parsnip attached at summit of carpophore. 248. Flower of 

 Viscaria with obscure anthophore. 249. Flower of Maerna, a gonophore at a, a gynophorc at h. 

 250. Gynobase of Borago. 251. Numerous pistils of Magnolia, imbricated upon a carpophore. 252. 

 Greatly enlarged gynophore of Xelumbium. 253. Ring-shaped disk (a) of Halpichroa adnate to calyx. 

 254. Epigynous disk (a) of Coussarea. 



Abbreviation of the Internodes. — The al)o\e considerations refer to 

 elongations of internodes of the torus. The condition of adnation of 

 floral parts may, upon the other hand, be usually looked upon as one 

 in which the normally very short internodes of the torus are still further 

 shortened, so as to bring the parts into most intimate connection. 



Lateral Expansion of the Internodes.- lii>tca(l of nudcrgoing a uumt 

 elongation of its internodes, the torus may l)c latcrall>- exi)anded at any 

 or all points, with or without elongation, and in imuiincrable forms. 



The Disk. — An exi)ansion or appendage of this kind, although the 

 term may be properly regarded as including all forms of enlargement 

 or extension of the torus, is called a Disk. 



Forms of the Disk. — The sim])lest form is, ])crliaps, that seen in the 

 blackberry, a hemisphere, with the j)istils arranged ui)on its surface 



