A MORPHOLOGICAL STUDY OF SOME MEMBERS 

 OF THE GENUS PALLAVICINIA 



BY 



DOUGLAS HOUGHTON CAMPBELL 



AND 

 FLORENCE WILLIAMS 



CONTENTS 



Introduction. 



Pa!' Zollingeri (Gottsch.) Schiffncr. 



Pallav; iiculosa (Sande) SchiflFner. 



Pa t I^vicri Schiffncr. 



The Antheridium. 

 Spermatogenesi 

 I IK- Archegonium. 

 The Kinhryo. 

 Spore Division. 

 Summ.i 

 Conclusions. 

 Biography. 



INTRODUCTION 



The 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 



\nacrog) ngermanniales. or. as less commonly denominated, 



the aceae. 



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

 these plants, notably the important investigations of Leitgvb (l) and 

 Goebel [i. 2] as well as the earlier studies of Hof master (i) and others, 

 the minute study of their e and development has been confined 



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



