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92 FIELDIANA: BOTANY, VOLUME 28
ly elongated, the lower surface glabrous except for 10-13 dull white,
tomentose, longitudinal bands, deep green on upper surface, dull
green on lower surface; fruking spadix arising at base of (below)
leaf sheath, 5-10 era. wide at base, 2-3 era. wide in middle portion,
0.5-1 cm. wide in the upper half, glabrescent or finely sparsely
appressed-pilose above or finely strigose below; fruking sheaths
covered with a dull gray, fine coating, which is covered over, especially
on the lowermost sheath, with brown appressed short hairs;
mesocarp whitish, dry-scaly, with irregular, castaneous, thread-like
parts running lengthwise through tissue; outside of endocarp dark
brown with irregular buff or pale brown longitudinal lines anastomosing
or branching on surface.
Type in herb. Chi. Nat. Hist. Mus., collected in lower portion of
Quebrada O-paru-ma, tributary of Rio Pacairao, below Santa Teresita
de Kavanayen, state of Bolivar, alt. 915-1065 m., November 25, 1944,
Julian A Steyermark 60541*
Known locally as "Capai-chan-yek" ("Cola de Pescado"). The
bark and wood are used locally by the inhabitants for making into
roofs.
This species is distinguished by the longitudinal lines of white
tomentum on the lower surface of the leaf segments, which are otherwise
glabrous, by the concolorous leaf surfaces, and by the dense
tomentum over the surface of the leaf rachis, especially in its lower
portion. From S. elegans Karst., described as having the lower side
of the leaf segments with "lineis albo-tomentosulis notatas", this
new species differs in the concolorous rather than glaucous lower
leaf surface, and in the segments with longer, more erose tips.
ARACEAE
Anthurium duidae Steyermark, sp. nov.
Planta terrestris glabra; caudice paullo elongato, 5 mm. crasso,
internodiis 1.5-3 cm. longis; cataphyllis ovatis vel lanceolatis,
obtusis, nervatis, 1.5-5 cm. longis, 1-1.3 cm. latis; petiolis lamina
longioribus, 19-28 cm. longis, 2.5-3 mm. crassis; lamina in sicco
subcoriacea, late ovato-oblonga, 13-16 cm. longa, 8-11 cm. lata,
supra obscure viridi, subtus pallida, apice rotundata, basi subcordata,
nervis primariis utrinque 1, basi nascentibus, 1-1.3 cm. a
margine remotis, utrinque distincte prominentibus.
Blades deep green above, pale below.
Type in herb. Chi. Nat. Hist. Mus., collected on summit of Cerro
Duida, along valley forest between Central Camp and Brocchinia
Hills, Territorio Federal Amazonas, alt. 1675 m., August 31, 1944,
Julian A. Steyermark 58099.
In leaf shape this species somewhat resembles A. marense Krause,
but that species has the primary nerves more remote from the margin