T3 8 BOTANICAL GAZETTE [february 



which ocular 2 (magnification 355) was used. They were reduced J in repro- 

 duction, canceling the enlargement due to the camera and rendering them the 

 same size as they were seen in the microscope. 



, PL A TE III 



Fig. i.— A lateral section of a cyst, showing numerous groups of small nuclei 



due to nuclear gemmation. 



Fig. 2. 



fig 



Figs. 3-6.— The breaking-up of the mother karyosome preparatory to the 

 migration of the chromatin. 



Fig. 7 — Bipartition of the mother karyosome to form equal daughters. 



Fig. 8— Nucleus with a large number of daughter karyosomes lying on the 

 nuclear membrane, only one hemisphere of which is shown. 



Fig. 9— A nucleus with one of the daughter karyosomes pressed against the 

 nuclear membrane; three small nuclei which have budded off from it near by. 



Fig. 10— Daughter karyosome constructing its nuclear cavity and membrane. 



Fig. 11.— Daughter nucleus complete but still closely appressed to the mem- 

 brane of its parent. 



Figs. 12, 13.— Karyosomes of daughter nuclei separated from the parents 

 but their membranes still in contact. 



Fig. i 4 .-Daughter nucleus separated from its parent but lying close by. 



«rtKVuf' I5-1 7;~ Nw kar gemmation from the spirem stage. (Fig. 16 is one 

 of the large nuclei from the center of the cyst from which Jigs. 1 and 2 were taken.) 

 •tigs. i8- 2 o.-Resultant groups of small nuclei. 



_ PLATE IV 



F™ 2I ~ 2 ^~ Sta 8 es in the degeneration of the parent nuclei. 



mantitfe'/lH UC , lei J fr ° m Whkh chromatin has been thrown out in laif 



quantmes and is mostly degenerating without forming new nuclei. 



some slightiy ir^uTar^ * heter ° Schizis ' nuclear membrane dissolving, karj-o- 

 Same'cysfaT^.^^ 6 ^ nUdear Cavky lost ' kaiyosome much enlarged. 



f!gs 2 ^?r me l ° bed - Same «** "M**- 2 ? and 28. 

 the daughter Iw^T™^ ^ Up ' n ^ clear membranes appearing around 

 Fig „ a , ( g - 32 * from the sa me cyst as Jigs. 27-29) 



j|G. 33.--A very large cluster complete, 

 by hetero 3 schizis. Slngle UV ° aA ff ° m a summer *°™ whose nucleus has divided 



^withT c ° f ? indleS arisin 8 from ^e division of such a cluster 

 ier with a single spindle of nn , n < *i.„ ~*u ,_: „* ♦»,« ™t. 



fig 



FlG - 35- 

 33, togel 



Fig. 36. 



a^ 



the same cyst- c nrohaW P , Slmilar to M- 35; b, a solitary spine 



Fig. 39 ._a nucleus h pmdles ,n anaphase, 



which radiations are dve^lff ^7 stainin g granules on its membran 

 **• 40.-A nuclei e r^° the . ooplasm. 



from 











