15 



of Pythliun (MIYAKE, '01), Al"bugo (STEVENS, '99, •00), and 

 Peronospora (WAGER, '89). Simtiltaneous nuclear division 

 is reported also in the plasiaodia of PULIGO (IIARPER, '00), 

 in Plasrnodiophora (UAY/ASCHIIT, '99), in the "ascus" of 

 Hemiasci (JUEL, '02, POPTA, '99), in the ascus of Ascomy- 

 cetes (PIARPER, '97) , in the hasiditun of Basidionycetes 

 (I'lAIRE, '02), and in the "binucleei.te cells of IJredineae 

 (SAPPIN-TROIIPPY, '96). Aiaong algae, approximately simul- 

 taneous nuclear division is knovvn in the germinating zy- 

 gotes of desmids (KLICBAHIT, '91) in the young colonies of 

 Volvox (OVERTON, '89), in Sphaeroplea (ICLEBAHN, »99), in 

 Hydrodlctyon ( TIMBERLAJvE , '02) in the anther idia of Fucus 

 (GUIGNARD, »89). In the vegetative cells of Cladophora , 

 SERASSL'EGER found that nuclear division is not simultaneous 

 though he reports that several sta.ges of mitosis s.re to be 

 found in a cell at the same time. TkiS seems to indicate 

 that the stimulus to division affects more than one nucleus 

 at a time. Among the Arclie^oniates , simultaneous nuclear 

 division is figured hy Miss Lj'^on for [Telaginella ('01), and 

 seeEis to he the rule in the developing endosperm a,nd in the 

 early divisions in the fertilized egg of Gymnosperms 

 (COULTER and CHAIvlBERLAIIT , '01, pp. 20, 31, 41, 83, 98); in 

 the free cell formation of the endosperm of many Angio- 



