PDF - University Library

180 FIELDIANA: BOTANY, VOLUME 28
into a transverse peltate plate about 1.6 mm. across; mid-lobe minute,
oblong-ovate, long-hirsute. Column about 1.4 mm. long, dilated
above, orchid-rose (Fig. 31)
Type in herb. Chi. Nat. Hist. Mus., no. 1207544, isotype in Herb.
Ames no. 64841, on densely forested steep south-facing slopes overlying
sandstone, between "Cave Rock" and base of high sandstone
bluffs, Ptari-tepui' state of Bolivar, alt. 2100-2285 m., October 30,
1944, Julian A. Steyermark 59540 "leaves pale green above and
paler green beneath".
This species appears to be allied to Lepanthes cyanoptera Reichb.
f., but has longer leaves and dissimilar sepals and petals.
Pleurothallis callifera C. Schweinfurth, sp. nov.
Herba epiphytica, mediocris, caespitosa. Caules numerosi, graciles,
variabiles, apice unifoliati. Folia valde variabilia, saepissime
horizontalia, lanceolata vel saepius ovato-lanceolata vel ovata,
acuta vel acuminata, basi cordata. Inflorescentiae abbreviatae,
uniflorae, singulae vel plures. Flores parvi, bilabiati, glabri.
Sepalum dorsale oblongo-ovatum, concavum, acutum. Sepala lateralia
in laminam triangulari-ovatam, acutam, concavam omnino connata.
Petala patentia, lineari-lanceolata, acuminata, basi obliqua. Labellum
in positu natural! arcuato-recurvum et sulcatum, expansum
rhombico-ovatum, membranaceum; discus prope basim carina transversa
crescentiformi ornatus. Columna crassa, perbrevis.
Plant epiphytic, medium-sized, caespitose. Roots numerous,
fibrous, glabrous. Rhizome abbreviated. Stems approximate, slender,
provided below with 2 close separated tubular sheaths of which
the upper is much the longer, very variable in size, about 9-23.5 cm.
long, 1-leaved at the apex. Leaf very variable in form and size,
commonly horizontal or widely spreading, lanceolate (rarely) to
ovate-lanceolate or ovate, acute or acuminate with a minutely
tridenticulate
tip, cordate at the sessile base, 5.8-10.8 cm. long, 1.9-
4.4 cm. wide. Inflorescences abbreviated, axillary, 1-flowered,
apparently solitary to several, enclosed in an evanescent conduplicate
spathe. Flower small, glabrous, bilabiate. Dorsal sepal
oblong-ovate, acute, 3-nerved, concave, about 7 mm. long and 4 mm.
wide. Lateral sepals entirely connate into a triangular-ovate concave
lamina which is acute, 5- to 6-nerved, about 7 mm. long and
4.4 mm. wide. Petals linear-lanceolate, acuminate, oblique at the
base, 1 -nerved, about 6 mm. long and 1.1 mm. wide at the base. Lip
arcuate-recurved and sulcate in natural position, rhombic-ovate when
expanded, submembranaceous, cuneate below, obtuse at the apex,
3-nerved with the mid-nerve clavate and thickened near the tip, about
4 mm. long and 3.2 mm. or more wide when expanded; disc with a
prominent transverse crecentiform keel or callus near the base.
Column abbreviated, stout (Fig. 32).
Type in herb. Chi. Nat. Hist. Mus., no. 1206418, isotype in Herb.
Ames no. 64844, on densely forested steep south-facing slopes over-