205 



I' 



VII. An Anatomical Study of the JBalcBOzoic Cone-genus Lepidostrobus. 

 By Agnes Arber, D.Sc., F.JJ.S., Fellow of Newnham College, Cambridge. 



(Plates 21-27, and 4 Tigures in the Text.) 



Eead 19th June, 1913. 



^ 

 ^ 



Contents. 



Pagfl 



1. Introduction 205 



2. A Survey of our Present Knowledge of the Structure of Lepidostrohus 20G 



3. On certain hitherto Unrecorded Features in the Structure of Lqndostrobus 



oldhamius, Will., and L. foliaceus, Maslen 208 



4. A Description of some I\ew Forms of Lejtidoslrohus 212 



(i.) L. Binneyanus, sp. nov 212 



(ii.) L. gracilis, sp. nov 217 



(iii.) L. oldhamius, "Will., f. minor 220 



(iv.) L. oldhamius. Will., f. pi7osi«s 223 



5. On a Case of Variation in the Anatomical Characters of Different llegions 



in a Single Cone 223 



6. On the Relation hetweeu Structure and Function in the Cone-genus 



Lepidostrobus ^'^^ 



7. List of Memoirs cited 2o- 



8. Explanation of the Platea 233 



1. Ikteoduction. 



The collection of fossil plants in the Sedgwick Museum, Cambridge, includes sections 

 of certain specimens oi Lepidostrobus, which differ considerably from those members of 

 this cone-genus whose structure has been previously described. The present memoir is 

 based upon a study of these sections, and also of a large number of preparations from 

 other collections. " In this connection I would express my great indebtedness to those 

 botanists who have kindly lent me sections of these cones and allowed me to 



Professor F. W. Oliver, F.R.S., Dr. D. H. Scott 



eiss. To Dr. Scott 



describe them,— Dr. W. J. Jongma 



P.It.S., Miss Winifred Smith, Mr. D. M. S. Watson, and Professor \\ 



I must, in addition, offer my thanks for tlie help and information he has kindly gi^ 



me. I have 



of Geology, British Museum (Natural History), for allowing me opportunities of 



also to thank Dr. A. Smith Woodward, F.R.S., the Keeper of the Department 



tudying the specimens under his charg 



C 



sections, which have bee 



of 



use In this investigation, have been purchased by aid of a grant from the British 



Association, for which I am m 



indebted 



SECOND SERIES. — BOTANY, VOL. VIII. 



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