No. 450.] STUDIES ON THE PLANT CELL. 



439 



Kinoplasmic caps which form spindles are iMoliahlv an evoki 

 tion from the type of centrosphere that is (IcvolojH'd (h- novo 

 with each mitosis as in Pelha. Such centr()S])luM\-s hv bt-ToniinL; 

 less definite m form and lacking^ radiating; tilxTs wDuld ht.' called 

 kinoplasmic caps. Indeed the centr()si)hi'n- sn cx kU'iU in the 

 early cell divisions of the germinatin-;- spore nt IVllia hcc omes a 

 kinoplasmic cap in the later mitoses ot the older -ameiopliyte 

 (Davis. :oi). 



Si)indles developed from kinoi-^ ' > 



onic regions. They have been cspeuall) .studied 111 hi,^ 

 by several investigators and foi a lal,^L numlH i ot loi 

 most completely described being P.-.ilotum < K'>s<. n. 

 tum, Allium and Solanuni ( NeiiHA, ijS.i and v^'jo 

 Pteris, Ephedra and \ uia. (I'l-, 3 ./. aum I) (H't 

 Allium (McComb, :oo). I he pohu caps ht^l ajjpeai a 

 lations of kinoplasm on opposite sides ol the nutk 

 generally elongates. The protoplasm is granular anc 



