| 
| 
i 
BENEDICT: REVISION OF THE GENUS VITTARIA 409 
Fic: ifs Cross-section of petiole about 2 mm. above stem 
Fics. 5-8. Successive cross-sections of petiole less than 2 mm. from stem, 
showing single leaf-trace and its division. 
G. 9. Cross-section of stem, showing origin of a petiole and a leaf-trace. 
i to. Stem scale, showing cilia, most of which have been broken o 
All the figures were drawn from type material, R. S. Williams 1337, Bolivia. 
PLATE 18, VITTARIA STIPITATA Kunze ‘ 
Fic. 1. Whole plant, showing general habit and soriation. 
Fic. 2. Cross-section of leaf in fertile part. 
Fic. Cross-section of leaf below fertile part 
Fics. 4and 5. Cross-sections of petiole more dts 2 mm. above stem 
Fic. 6. Cross-section of stem showing origin of a petiole with a seat iaien not 
yet divided. 
Fic. 7. Whole plant, about the smallest see 
Fic. 8. Cross-section of leaf of larger plant se same collection esata 
Fic. 9. Single leaf attached to stem; the leaf t d broadest 
observed. 
Fic. 10. Cross-section through fertile part of same leaf shown in fig. 9 
Fic. 11. Cross-section through fertile part of another somewhat different leaf. 
Fics. 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 
IGS. 15 and 16. Scales with an unusual amount of cell development. 
FIGs. 17-19. Scales of the usual type 
FIG. 20. n old scale from which the ater = of the cells have been lost. 
Specimens figured: figures 1-6, W. R. Maxon 4476, Cuba; 7 and 8, R. S.- 
Williams er Bolivia; 9 and 10, H. H. Smith pens Colombia; 11-14, 17-19, R. S 
Williams 890. Panama; 15 and 16, Wercklé, Costa Rica; 20, H. H. Smith 1112. 
Colombia 
PLATE I9. VITTARIA RUIZIANA Fée 
iG. 1. Whole plant, showing general habit, venation, and soriation. The 
petioles are unusually short in this plan 
Fics. 2 and 3. Cross-sections shroueble fertile part of a leaf, showing pointed 
Margin, and the sporangial groove, which is much shallower than in V. stipitata 
Kunze. 
Fic 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. 
-Fic. 5. Cross-section through fertile part of leaf of type collection. 
Fic. 6, ross-section through fertile part of an unusually narrow leaf. 
reg 7 and 8. Cross-sections through petiole more than 2 mm. genes stem. 
Fic. 9. Cross-eection through petiole very close to stem, and before simple 
leaf-trace has divided. 
Fic. 1 
Spe s figured: figures 1-4, H. H. Smith 1112 (in National Herbarium), 
Soleiatin: « Cele + Morits 143, Tovar, Venezuela (type 6-10, Sodiro, Ecuador). 
