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188 FIELDIANA: BOTANY, VOLUME 28 Pleurothallis sub til is C. Schweinfurth, sp. nov. Herba mediocris, epiphytica. Rhizoma abbreviatum. Caules secundarii approximati, graciles, a basi decumbent! suberecti, apice unifoliati. Folium lineare, apice abrupte tridentatum, basi cordatum, coriaceura, marginibus revolutis. Inflorescentiae azillares, uniflorae, singulae vel plures. Flores perparvi, flavidi, glabri. Sepalum dorsale valde concavum, suborbiculari-ovatum, obtusum. Sepala lateralia in laminam concavam suborbicularem, apice bidentacam connata. Petala falcata, oblongo-lanceolata. Labellum ovatum, obtusum, valde incrassatum, basi abrupte reflezum et a latere visum sigmoideum. Columna valde arcuata, supra dilatata. Plant medium-sized, epiphytic, apparently caespitose. Roots fibrous, filiform, glabrous, numerous. Secondary stems very variable in size, numerous, slender, rigid, suberect from a decumbent base, 1-leaved at the apex, enveloped below by one to three close tubular evanescent sheaths, up to 19 cm. long. Leaf commonly horizontally spreading or reflexed, linear, narrowed above to an abrupt minutely tridentate apex of which the middle tooth is produced into a conspicuous mucro, cordate at the base, coriaceous with strongly revolute margins, very variable in size, up to 12.7 cm. long and about 8 mm. wide when expanded. Inflorescences axillary, abbreviated, 1- flowered, solitary or several (up to 7), enclosed by an evanescent concave spathe. Flower very small, bilabiate, glabrous, with sepals, petals and column pale yellow and lip deep yellow. Sepals concave. Dorsal sepal suborbicular-ovate, obtuse, 3-nerved, about 3.5 mm. long and 2.5 mm. wide when forcibly expanded. Lateral sepals connate into a suborbicular lamina which is bidentate at the apex, 4-nerved, and slightly shorter but broader than the dorsal sepal. Petals falcate, oblong-lanceolate, obtuse, 1-nerved, with slightly irregular margins, about 3*3 mm. long and 1 mm. wide. Lip ovate, very fleshy, obtuse, abruptly reflexed at the base and sigmoid in natural position when viewed from the side, cordate at the base when viewed from the front, about 2 mm. long and 1.5 mm. wide. Column strongly arcuate, abruptly dilated above (Fig. 35). Type in herb. Chi. Nat. Hist. Mus., no. 1206354, isotype in Herb. Ames no. 64845, rich forest on slopes near summit of Cerro San Isidro, above La Carbonera, state of Merfda, alt. 2430-2475 m., April 22, 1944, Julian A. Steyermark 56030, "epiphyte on Ladenbergia undata, leaves dull blue green above and paler beneath". This species differs from the Bolivian Pleurothallis scleropus Schltr. in having smaller flowers with dissimilar sepals. It is ^egetatively similar to the narrow-leaved form of the Peruvian P. juninensis Schltr. Octomeria rhizomatosa C. Schweinfurth, sp. nov. Herba epiphytica, pro genere alta et rigida. Rhizoma repens, elongatum ut videtur. Caules secundarii graciles, apice unifoliati,
BOTANICAL EXPLORATION IN VENEZUELA - I 189 PLEIIROTHALLIS a suMiis FIGURE 35 Pleurothallis subtilis. 1, Plant (X 3/5>, 2, Flower, three-quarter view (X 6); 3, Lip from the side and from above (X 10); 4, Petal (X6).
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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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