VOLUME XLVII 



NUMBER 3 



Botanical Gazette 



MARCH igog 



MITOSIS IN FUCUS 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 1 24 



Shi geo Yam a no uc hi 

 (WITH PLATES viii-xi) 



INTRODUCTION 



The first cytological study of Fucus is that of Farmer and 



(8) 



Strasburger's paper (24) on Kerntheilung 



fwhtung bei Fucus appeared. In 1898 the final paper of Farmer 

 and Williams (9) was published. 



Farmer and Williams' material, Fucus plaiycarpus, F. serratus, 

 and F. vesiculosa, was collected on the coast of England. Their 

 account deals with egg-formation in the oogonium, particular atten- 

 Uoi J being devoted to the third division ; also with fertilization and 

 ^ }' segmentation divisions. Ascophyllum nodosum and Pelvetia 

 unahculata were used in a supplementary way. Strasburger's 

 in was bas ed chiefly on material from Heligoland, Germany; 

 he describes in detail the third division in the oogonium of 



*«* pktycarpus and the fertilization processes in F. serratus and 

 *• 'Wtculosus. 



T 1 



knowll brilliant results of thes e authors we owe most of our present 



Well ° f ^ cytolo Sy of these f orms - Since the work of Farmer > 



i n a f UMS ' and St Rasburger, cytological conditions have been studied 

 *) , and P ^ • SUCh aS Dict y° ta (Williams 27), Nemalion (Wolfe 



1 n p olysiphonia (YAMATsrnTTrwr ot\\ Th P mnrnholoev of chro- 



mosome " ' (Yamanoe 



of 



alternation 



Problem ^ eSpecial ty in the al g a e, is becoming a more important 



or the solution of such a Droblem. there must ' 



*73 



