American Species of Marchantia. 



243 



The present species was based on a specimen without recep- 

 tacles or gemmae. When originally described its generic posi- 

 tion was considered doubtful, but the authors of the Synopsis 

 saw clearly that it represented a Marchantia and suggested its 



Fig. 3. Marchantia plicata Nees & Mont. 



Appendages of ventral scales, x 100. D represents the basal portion of 

 an appendage ; the other figures represent apical portions. A. Ecuador, 

 W. Jameson. B-D. Peru, H. W. Foote. E-G. Peru, Cook & Gilbert 

 672, 1162, 1321. H. Bolivia, A. d'Orbigny, type. I. Bolivia, M. Bang 910. 



relationship to M. polymorpha. Unfortunately the absence of 

 receptacles made a positive conclusion impossible, and they were 

 therefore obliged to place it among the species "incertae sedis." 

 A portion of the type material from the Montague herbarium, 

 kindly forwarded by M. Paul Hariot, has been carefully com- 



