

A MORPHOLOGICAL STUDY OF SOME MEMBERS 

 OF THE GENUS PALLAVICINIA 



BY 



DOUGLAS HOUGHTON CAMPBELL 



AND 



FLORENCE WILLIAMS 



CONTENTS 

 Introduction. 



Pallavicinia (Mittenia) Zollingeri (Gottsch.) SchifTner. 

 Pallavicinia radiculosa (Sande) SchifTner. 

 Pallavicinia Levieri SchifTner. 

 The Antheridium. 

 Spermatogenesis. 

 The Archegonium. 

 The Embryo. 

 Spore Division. 

 Summary. 

 Conclusions. 

 Bibliography. 



INTRODUCTION 



The Liverworts, probably the most primitive of existing land-plants, 

 offer many important morphological problems to the botanist. Among 

 the Liverworts, no group is more interesting than that known usually as 

 the Anacrogynous Jungermanniales, or, as less commonly denominated, 

 the Metzgeriaceae. ' 



While a good deal of work has been done upon the morphology of 

 these plants, notably the important investigations of Leitgeb [i] and 

 Goebel [i, 2] as well as the earlier studies of Hofmeister [1] and others, 

 the minute study of their structure and development has been confined 

 to a comparatively small number of species ; and further investigations on 



