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194 FIELDIANA: BOTANY, VOLUME 28 triangular with upcurved sides and subacute apex in natural position, broadly ovate if forcibly flattened, "pointed with inrolled margins"; deep yellow disc between the lateral lobes with a high subquadrate fleshy purple callus and a small irregularly subglobose callus just in front. Column relatively slender but gradually bialate toward the apex, arcuate, whitish above and greenish white and "lightly pubescent" below, about 2 cm. high (Fig. 37). Type in herb. Chi. Nat. Hist. Mus., nos. 1203742, 1203744, isotype in Herb. Ames no. 64855, along base of east-facing high sandstone bluffs, Ptari-tepui^ state of Bolivar, alt. 2410-2450 m., November 7, Julian A. Steyermark 59922, This species appears to be quite distinct from all of the other Acinetas noted by reason of the relatively shallow sinus between the lateral and middle lobes of the lip and by its abbreviated not spatulate middle lobe. Zygopetalum Tatei X. & S. var. angustilabium C. Schweinfurth, var. nov. Herba v aria bills, pseudobulbis brevioribus et nunc latioribus unifoliatis atque la belli epichilio multo angustiore a specie differt. Plant epiphytic, very variable, closely similar to the species. Pseudobulbs cylindric (as in the species) to ellipsoid or complanatesubglobose, up to 3 cm. long (instead of 3.6-6 cm. long in the species), unifoliate (not bifoliate). Scape about 13.5 cm. or less long (instead of 35 cm. or more long), 1- (rarely) or loosely 2-flowered above. Flowers about as large as those of the species except for the epichile of the lip which is ovate or rhombic-ovate and acuminate (instead of abruptly apiculate) about 1.9 cm. long and only 1.3 cm. wide (instead of 2.3-2.8 cm. wide in the species). Type in herb. Chi. Nat. Hist. Mus., no. 1203947, isotype in Herb. Ames no. 64861, epiphyte on branch, summit of Carrao-tepui, state of Bolivar, alt. 2470-2500 m., December 7, 1944, Julian A. Steyermark 60909, "sepals and petals pale yellow or olive green with pale brown transverse bands, lip white with purple above and on crest, column rich yellow with magenta on margin and magenta streaks within"; same locality and date, epiphyte on trunk of Bonnetia Roraimae, "leaves coriaceous, dark green above and dull green beneath, sepals and petals orange-brown, lip white with dull brown at base, column dull orange", Steyermark 60908; same locality and date, "leaves dark green, lip creamy yellow, column pale grass green", Steyermark 60910. Maxillaria condensata C. Schweinfurth, sp. nov. Herba epiphytica, ramosa, late patens. Caules graciles, vetustiores remote pseudobulbiferi, panes juniores cum vaginarum foliiferarum disticharum imbricantium fasciculis. Folia parva, variabilia, saepissime elliptica vel oblonga, crassa ut videtur. F lores parparvi, e vaginarum axillis exorientes. Sepalum dorsale elliptico-oblongum,
BOTANICAL EXPLORATION IN VENEZUELA 195 FIGURE 38 Maxillaria condensata. 1, Plant (X 3/5); 2, Flower from the front, expanded with the lip detached (X 2>, 3, Lip, three-quarter view (X4).
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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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