THE COMMENCEMENT OF THE PHANEROGAMIC FRUIT. 



77 



ee receptacular ridges. The ovules are borne on longitudinally-running cushions 

 the carpels. This class of ovary is found in great variety amongst the 

 jhidacese (figs. 207 ^ and 207 ^ and figs. 212 L 2. s. *). 



Carpels of Two Kinds. 



(14) One series of carpels, destitute of ovules, arise from the margin of the 

 sply-excavated receptacle, roofing it in. Another series, metamorphosed into 



Fig. 209. — Structure of Phanerogamic Ovaries. 



gitudinal section of the ovary of Cereus grandiflorus. 2 Ovules on a branched placenta from the base of the ovary of 

 erem. 8 Longitudinal section of the ovary of Hedychium angustifoUum. * Dehisced fruit of the same plant. ' Trans- 

 erse section of the ovary of the same. « Longitudinal section of an Almond tLovev (Amygdalua communis). ' Longi- 

 idinal section of the ovary of the same. », s Transverse and longitudinal sections of the ovary of the Willow-herb 

 'SpUoMum angustifolum). 1 natural size ; »,*,', « slightly magnified ; 2, r, 8, « x 10. 



le-bearing strings, arise spirally from the inner wall of the receptacle and 

 ect into the ovarian cavity. Examples are afibrded by the Cactaceas, e.g. 

 mtia and Cereus (figs. 209 ^ and 209 ^). 



'15) One series of carpels closes the mouth of the excavated receptacle, as in 

 . The other series, bearing the ovules, are filamentous, and arise as a whorl 

 1 the base of the receptacle; they are consolidated with a thread-like prolonga- 

 of the tip of the axis which runs up as a central column. Example: — The 

 !ow-herb (Epilobium, figs. 209^ and 209^). 



