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182 FIELDIANA: BOTANY, VOLUME 28 PLEUROTHALLIS C, FIGURE 32 Pleurothallis callifera. 1, Plant (X l/2>, 2, Flower from the side (X 4>, 3, Petal (X 5); 4, Lip, from above (X 5); 5, Lip and column, from the side (X 5).
BOTANICAL EXPLORATION IN VENEZUELA - I 183 lying 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 59541, "leaves coriaceous, dark green above and pale green beneath; sepals translucent, dull green with dull lavender stripes; petals spreading, dull lavender; lip dorsal, erect, purple, depressed along the middle". This species appears to resemble Pleurothallis undulata Poepp. & Endl., but the membranaceous rhombic-ovate lip is distinctive. Pleurothallis exilis C. Schweinfurth, sp. nov. Herba perparva, calcicola, caespitosa. Rhizoma abbreviatum. Caules secundarii perparvi, approximati, apice unifoliati. Folium late spathulatum vel anguste oblanceolatum, apice rotundatum vel acutum, infra sensim angustatum. Inflorescentia abbreviatae, bivel quadriflorae, flos membranaceus. Sepalum dorsale valde concavum, oblongo-lanceolatum, acutum. Sepala lateralia in laminam concavam elliptic o-ovatam connata. Petala breviora, late obovata, obliqua, abruptius acuta. Labellum quam petala paulo brevius, in positu natural! conduplicatum, expansum anguste ovatum, apice rotundatum, marginibus anterioribus denticulatis. Columna apice cum ala lacerata. Plant very small, caespitose. Roots fibrous, glabrous, relatively stout. Rhizome abbreviated. Secondary stems numerous, approximate, filiform, 1-jointed, mostly concealed by 2 imbricating tubular evanescent sheaths, 1-leaved at the apex. Leaf erect or spreading, broadly spatulate to narrowly oblanceolate, acute to rounded with a minutely tridenticulate apex, gradually narrowed to an indistinct petiole, up to 2.5 cm. long and 7 mm. wide, marginate. Inflorescence abbreviated, with two to four flowers, the segments (in our specimen) on the summit of an ellipsoid ovary. Dorsal sepal strongly concave, oblong-lanceolate, acute, 3-nerved, membranaceous, about 3.7 mm. long and 2 mm. wide when expanded. Lateral sepals connate into a concave elliptic-ovate lamina which is 4-nerved, about as long as the dorsal sepal and 3.4 mm. wide when expanded. Petals broadly obovate, oblique, rather abruptly acute, 1-nerved, about 2.6 mm. long and 1.6 mm. wide. Lip conduplicate and gently recurved in natural position, simple, narrowly ovate when expanded, rounded at the apex with the anterior margins denticulate, about 2.5 mm. long, finely papillose especially on the inner surface. Column shorter than the lip, slightly arcuate, terminated by a lacerate wing (Fig. 33). Type in herb. Chi. Nat. Hist. Mus., no. 1206448, isotype in Herb. Ames no. 64846, base of limestone bluffs, Cerro de la Cueva de Dona Anita, south of and bordering valley of Caripe, state of Monagas, alt. 1100-1200 m., April 7, 1945, Julian A. Steyermark 61902, "common in crevices of lime bluffs, leaves deep green above and gray green beneath". This little species recalls Pleurothallis barbulata Lindl., but has very different petals and lip.
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o 2 CM XI E> RAR.Y OF THL UNIVERSIT
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FIELDIANA: BOTANY A Continuation of
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NUMBER 1 LIST OF ILLUSTRATIONS TEXT
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PAGE 67. Emmotum ptarianum 342 68.
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CONTRIBUTIONS TO THE FLORA OF VENEZ
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BOTANICAL EXPLORATION IN VENEZUELA
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