Explanation of PL XX. 



Bleclmwn plagiogyriifrons HAY ATA. 



Fig. 1. The plant. 



2. A scale on the rhizoma. 



3. A pinna, indusium and sporangia taken off, showing venation. 



4. 5. Basal and apical portion of a pinna. 



6. Cross section of a fertile pinna. 



7. Portion of the same section, showing the receptaculum. 



