VOLUME LIV 



NUMBER 6 



THE 



Botanical Gazette 



DECEMBER 19 12 



THE LIFE HISTORY OF CUTLERIA 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY 1 63 



Shig£ o Yamanotjchi 



■ 



(with fifteen figures and PLATES XXVI TO xxxv) 



Introduction 



This paper deals with nuclear conditions in Cutleria multifida 

 J. Ag. and Aglaozonia re plans Crouan, both of which are found in 

 the Bay of Naples. In common with Zanardinia, another member 

 of the Cutleriaceae, Cutleria and Aglaozonia are characterized by 

 having large motile spores. The vegetative body and method of 

 forming reproductive organs show a combination of characters 

 found in Ectocarpus, Sporochnus, Tilopteris, Sphacelaria, Battersia, 

 Zonaria, Padina, and Laminaria, genera belonging to different 

 families. 



The large motile spores attracted the attention of Thuret (63), 

 who was the first to do experimental work with Cutleria multifida. 

 Thuret was followed by many investigators who made cultures 

 of the spores in order to determine whether Cutleria and Aglaozonia 

 might be two alternating generations of one life cycle, but the 

 results were conflicting. 



Falkenberg (12), working with material from £ 

 iggested that Aglaozonia parvula is the asexual form 

 ultifida y and that Aglaozonia chilosa is the asexi] 

 utleria ads per sa. Church (6), with material from Ply 



form 



llaozonia reptans with Cutleria multifida, and Sauvage 

 with material from Guethary and Banyuls, proved tl 



441 



