^^4 BOTANICAL GAZETTE [march 



of centrosome without being genetically connected with that 



structure 



phrodium 



history, and the blepharoplasts which arise de novo in the cytopl 



-permatid 



found 



^ K-^ ^ ^^ ^^ ^— n — ^— -^ — ^^ — - ^ 



to discuss any relationship between them. If any genetic relation- 

 ship really exists between the two structures m the plant kingdom, 

 evidence might be sought in some of the lower forms, such as Snhace- 



species 



known and motile 



'/ male and female 



xual 



different 



time of fertilization has been studied in numerous 



Among thallophj^es the fusion of gamete nuclei was observed in 

 )sterium and Cosmarium (Klebahn 52), Rhopalodia (Klebahn 

 ), Cocconeis (KLaesten 50), Sphaeroplea fKLEBAHN K<; Golex- 



ANNS 



KIN 30), Oedogonium (Klebahn 52), Vaucheria (Olta 

 Davis 23), Coleochaete (Oltmanns 71), Fucus (Farmer and Wil- 

 liams 25, 26; Strasburger 86), Dictyota (Williams 97), Batracho- 

 spermum (ScH:iiiDLE 76; Osterhoft 72), Nemalion (Wolee 

 98j, Polysiphonia (Yamanouchi too), Basidiobolus (Fairchild 27), 

 .\lbugo (Wager 92; Stevens 81, 82; Davis 22), Peronospora 

 Onager 93), P^thium (:Miyake 63; Trow 91), Achyla (Trow 91), 

 Araiospora (King 51), Sphaerotheca (Harper 34), Pyronema (Har- 

 per 35 ) . No matter whether a condition of heterogamy is established' 

 or not in these forms after the union of gametes or gametangiafthe 

 male nucleus or nuclei pass into the cvtoolasm of the ess: or oogonium 



resting 



between the male and female 



conditions regarding the union of the sexual 



angiosperms were described by Strasburger (84) 

 by ScH-VFFNER (7sN for Sagittaria, by Coulter (19 



Ranunculus, by Moctier (66, 67) for LiUum 



Sflphium, and by others. Mother gives thrmost detailed account 

 chromatin at the time of the union, ^and figures the gamete nucl 



as unitmg with their chromatin 



1 



g condition. In the forms 



