16 



Fig. 9: Upper part of ovary and base of „stylus" in median, longitudinal 

 section,- no conducting tissue is to be found. [Obj. DD, ocul 1]. 



• 10: Papillated end of ,, stylus", representing a sort of stigma, but without 



poUengrains [Obj. D D, ocul. 1]. 

 » 11: Very young pistil in median, longitudinal section: the ovulum 



has just been formed; the apex of the carpel is growing forward to 



overwhelm it. [Obj. D D, ocul. 1]. 

 » 12: The same, in somewhat older stage [Obj. DD, ocul. 1]. 



• 13: The same, a little older; the ovulum is beginning to bend, the 



embryosac-mothercell is now distinct, the somewhat projecting lower 

 edge of the ,.acropyle" is being formed, but no „stylus", the 

 morphological end of the carpel bending over the dorsal surface of 

 the ovulum. [Obj. D D, ocul. 1]. 



» 14: Young pistil, front view; the ,,acropyle" is not yet closed, and 

 no „stylus" is formed [Obj. D D, ocul. 1]. 



" 15: Median, longitudinal section of a young pistil being only in a 

 little more advanced stage than fig. 13 ; the ,, stylus" and integu- 

 mentum iuterius of the ovule is just being formed. 



» 16: Median, longitudinal section of a young pistil, whose mor- 

 phological apex is growing downwards to meet the projecting lower 

 edge of the ,,acropyle": the „stylus"' is just growing out, the 

 mothercell of the embryosac is very distinct. 



» 17: Median, longitudinal section of a young pistil, being conside- 

 rably older than fig. 16: the ,.acropyle" is nos yet closed, the 

 „stylus" is a distinct, horizontal outgrow, and the two integuments 

 of the ovule are being formed. 



[Figg. 15, 16 & 17 : Obj. D D. ocul. 1]. 



» 18: Similar section of another young pistil in the same stage of 

 development [Obj. D D, ocul. 1]. 



» 19: Axial section of a young, nearly finished „stylus", the stigmatic 

 papils of which are not yet formed. [Obj. D D, ocul. compens. 4]. 

 20: Young ovule, median section; two integuments are formed. 

 [Obj. D D, ocul. compeu. 4]. 



21: Ripened ovulum, median section. The micropyle, formed only 

 of the inner integument, is totally closed. [Obj. D D, ocul. 1]. 



■ 22: Median section of au ovule a little older than fig. 20 in the 

 cavity of the ovary. [Obj. DD; ocul. compens. 4]. 



• 23: Threecelled embryo in the upper end of the embryosac. [Obj. 



apochrom- 3°»". ocul. compens. 4]. 



In all figures the letters indicate: 

 a: morphological end of the carpel, 

 b: ventral base of carpel [„Sohle" of the german botanists] forming the 



lower lip of „acropyle". 

 c: carpel. 



o: orificium or mouth of the ovarial cavity, called ,, acropyle" by the 

 freuch botanists, 

 ov: ovulum. 

 st: „stylus". 



27.-6.— 1905. 



SBUVN BIANCO LONO 



