410 Benedict: Revision of the genus Vittaria 



Plate 20. Vittaria Williamsii Benedict 



Fig. i. Single leaf, showing soriation and the extreme of length noted. 



Fig. 2. Whole plant {type), showing general habit, venation, and soriation. 



Fig. 3. Cross-section of half of leaf in fertile part, showing very slight depression 

 where sporangia are borne. 



Fig. 4. Cross-section through leaf below fertile part. 



Fig. 5. Cross-section through petiole more than 2 mm. above stem. 



Fig. 6. Scale showing the very heavily thickened apical portion. 



Specimens figured: figure 1, Rusby 33Q, Yungas, Bolivia; 2-6, all from type 

 material. 



