BENEDICT: REVISION OF THE GENUS VITTARIA 407 
The margins are also usually sharper than those of V. stipitata, 
and the sporangia are borne in shallower grooves. 
7. Vittaria Williamsii sp. nov. 
Rhizome erect, 0.5—-I cm. long, 2—2.5 mm. thick, unbranched, 
radially symmetrical, the scales small, lanceolate, blackish- 
costate at the base. Leaves 1-3, 25-70 cm. long, rather thick and 
rigid when dry, the petiole 10-15 cm. long, hard, terete or nearly 
so at the base, soon becoming flat and angled, hollow above the 
base, atropurpureous or green along the anterior ventral portion 
of the stipe, the lamina linear-lanceolate, 8-14 mm. broad, nar- 
rowed gradually both ways from the middle, plane or somewhat 
recurved, the apex somewhat acuminate, the margin thin, sharp, 
plane, the lower dorsal surface marked with a median purplish 
stripe extending up from the petiole: leaf-trace one, dividing in 
the base of the petiole, the midvein not evident on the surface, 
the veinlets not evident on the surface, intersecting 1.5-2 mm. 
apart, the areolae about 2 mm. broad, linear-rhomboid with the long 
axes at an angle of about 15° to the midvein; sporangia ina straight 
or slightly sinuate line, about 1 mm. from the margin, in an open 
very shallow groove. (PLATE 20. . 
Tyre from BottviA, Santa Ana, altitude 1,800 meters, R. S. 
Williams 1349, 29 Jl 1902. 
Also collected at Yungas, Botivia, altit. 1,300 m., H. H. 
Rusby 339. 1885. 
It is always a pleasure to work with Mr. Williams's specimens 
Owing to the excellence of their preparation. The present species 
is no exception. It is as well distinguished from the other species 
of this subgenus as is V. latifolia also collected by him. Its asso- 
ciation is, however, clearly with the species of the stipitata alliance 
of which it is the broadest example. 
SPECIES INQUIRENDA 
Vittaria Bommeri Christ, Bull. Herb. Boiss. II. 5: 11. 
I have seen a fragment of the original specimen of this species 
through the kindness of His Highness, Prince Roland Bonaparte, 
in whose herbarium it is deposited. I have not, however, enough 
to determine certainly the specific characters, although it appears 
to be close to V. Gardneriana Fée. 
