Benedict: Revision of the genus Vittaria 409 



Fig. 4. Cross-section of petiole about 2 mm. above stem. 



Figs. 5-8. Successive cross-sections of petiole less than 2 mm. from stem, 

 showing single leaf-trace and its division. 



Fig. 9. Cross-section of stem, showing origin of a petiole and a leaf-trace. 

 Fig. 10. Stem scale, showing cilia, most of which have been broken off. 

 All the figures were drawn from type material, R. S. Williams 1337* Bolivia. 



Plate 18. Vittaria stipitata Kunze 



Fig. 1. Whole plant, showing general habit and soriation. 



Fig. 2. Cross-section of leaf in fertile part. 



Fig. 3. Cross-section of leaf below fertile part. 



Figs. 4 and 5. Cross-sections of petiole more than 2 mm. above stem. 



Fig. 6. Cross-section of stem showing origin of a petiole with a leaf-trace not 

 yet divided. 



Fig. 7. Whole plant, about the smallest seen. 



Fig. 8. Cross-section of leaf of larger plant of same collection number. 



Fig. 9. Single leaf attached to stem ; the leaf was about the longest and broadest 

 observed. 



Fig. 10. Cross-section through fertile part of same leaf shown in fig. 9. 



Fig. 11. Cross-section through fertile part of another somewhat different leaf. 



Figs. 12-14. Cross-sections of same leaf about where the blade narrows into 

 the petiole. The shaded strip below represents the band of collenchyma which runs 

 part way up the blade. 



Figs. 15 and 16. Scales with an unusual amount of cell development. 



Figs. 17-19. Scales of the usual type. 



Fig. 20. An old scale from which the softer parts of the cells have been lost. 



Specimens figured: figures 1-6, W. R. Maxon 447d, Cuba; 7 and 8, R. S. 

 Williams 1338, Bolivia; 9 and 10, H. H. Smith 2568, Colombia; 11-14, 17-19. R- S- 

 Williams 8go. Panama; 15 and 16, Werckle, Costa Rica; 20, H. H. Smith 1112, 

 Colombia. 



Plate 19. Vittaria Ruiziana Fee 



Fig. 1. Whole plant, showing general habit, venation, and soriation. The 

 petioles are unusually short in this plant. 



Figs. 2 and 3. Cross-sections through fertile part of a leaf, showing pointed 

 margin, and the sporangial groove, which is much shallower than in V. stipitata 

 Kunze. 



Fig. 4. Cross-section through petiole more than 2 mm. above stem, showing 

 heavy collenchymatous development with aerated central portion. The leaf-trace 

 has divided into the midvein and two lateral veinlets. 



Fig. 5. Cross-section through fertile part of leaf of type collection. 



Fig. 6. Cross-section through fertile part of an unusually narrow leaf. 



Figs. 7 and 8. Cross-sections through petiole more than 2 mm. above stem. 



Fig. 9. Cross-section through petiole very close to stem, and before simple 

 leaf-trace has divided. 



Fig. 10. Stem scale. 



Fig. ii. Petiole scale. 



Specimens figured: figures 1-4. H. H. Smith 11 12 (in National Herbarium), 

 Colombia; 5, 11, Moritz 143, Tovar, Venezuela (type 6-10, Sodiro, Ecuador). 



