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The genus Plagiochasma 



A species closely allied to P. crenulahm is the East Indian P. 

 appendiculatum Lehm. & Lindenb., one of the two species upon 

 which the genus Plagiochasma was based. This interesting plant 

 is known to the writer from a series of specimens, including a part 



of Wallich's original collection in the Mitten herbanui 

 characterized, as Stephani notes, by the large appendages of the 

 ventral scales, cordate or broadly ovate in form, entire, obtuse, 

 and strongly contracted at the base. This description brings out 

 their peculiarities clearly. It may be added that the cell-struc- 

 ture of the appendages is fairly uniform except for a very narrow 

 border, where the cells are somewhat irregular and contorted. 



