TABLE OF CONTENTS 



PAGE 



The North American Species of Clavaria, 

 with Illustrations of the Type Speci- 

 mens E. A. Burt 1- 78 



Monograph of the Isoetaceae Norma E. Pfeiffer 79-232 



A Monographic Study of Thelypodium 

 and Its Immediate Allies Edwin B. Payson 233-324 



A New Hybrid Nymphaea George H. Pring 325-332 



A Bacterial Disease of Foxtail (Chaeto- 

 chloa lutescens) H. R. Rosen 333-402 



The Toxic Property of Sulphur H. C. Young 403-435 



General Index to Volume IX 437-442 



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