Ionopsis × atalibae (Orchidaceae, Oncidiinae), a new natural hybrid from the Brazilian Amazon Author Krahl, Amauri Herbert 0000-0001-7862-9624 Instituto Nacional de Pesquisas da Amazônia, Programa de Pós-Graduação em Botânica, Departamento de Botânica, Av. André Araújo, 2936, Aleixo, 69.060 - 001, Manaus, AM, Brazil. & amaurikrahl @ hotmail. com; https: // orcid. org / 0000 - 0001 - 7862 - 9624 amaurikrahl@hotmail.com Author Krahl, Dayse Raiane Passos 0000-0003-2899-9453 Instituto Nacional de Pesquisas da Amazônia, Programa de Pós-Graduação em Botânica, Departamento de Botânica, Av. André Araújo, 2936, Aleixo, 69.060 - 001, Manaus, AM, Brazil. & dayseraiane @ hotmail. com; https: // orcid. org / 0000 - 0003 - 2899 - 9453 dayseraiane@hotmail.com Author Pansarin, Emerson Ricardo 0000-0002-0355-8363 Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, 14040 - 901, Ribeirão Preto, SP, Brazil. & epansarin @ ffclrp. usp. br; https: // orcid. org / 0000 - 0002 - 0355 - 8363 epansarin@ffclrp.usp.br text Phytotaxa 2021 2021-01-06 478 2 268 274 http://dx.doi.org/10.11646/phytotaxa.478.2.8 journal article 4497 10.11646/phytotaxa.478.2.8 76f24cec-201c-4ef7-bf42-8dc067466963 1179-3163 5413249 Ionopsis × atalibae Krahl, D.R.P.Krahl & Pansarin nothosp. nov. Type : BRAZIL . Amazonas : Iranduba , Road AM-070, 3 ° 11’33.10”S , 60 ° 12’24.59”W , 0 m a.s.l., 06 July 2019 , epiphyte in Citrus tree, A . H . Krahl & F . C . L . Félix 1280 ( holotype , INPA-288758). Fig. 1 , 2A, 2D, 2G . Species with intermediate morphology between I. utricularioides and I. satyrioides . The leaves of I . × atalibae are deeply curved to supervolute-curved, and thick (vs. flat and coriaceous in I. utricularioides and acicular, thick and slightly furrowed in I. satyrioides ). The labellum of I . × atalibae is widely obovate ca. 1.1 × 1.0 cm, whitish to pale pink with dark purple oblique lines, apex deeply emarginate, while in I. utricularioides the labellum is widely obovate, ca. 1.5 × 1.5 cm , whitish to pale pink with pale purple oblique lines, apex deeply emarginate, and in I. satyrioides the lip is narrowly obovate, ca. 0.8 × 0.4 cm , pale purple with dark purple oblique lines, apex slightly emarginate. Epiphytic herb, caespitose. Pseudobulbs 0.7-1.5 × 0.2-0.6 cm , ovate or cylindrical, with a single apical leaf, covered by the sheaths of 3-4 lateral leaves. Leaves 2.7-15.2 × 0.4-0.6 cm , curved to supervolute-curved, fleshy, dark green, apex obtuse to acute. Inflorescence 13.2-22.5 cm , lateral, branched, with 9-36 resupinate flowers; floral bracts ca. 2 × 1 mm , lanceolate with an acute apex. Flowers whitish to pale pink; pedicel and ovary ca. 8 mm long, cylindrical; dorsal sepal ca. 5 × 2 mm , ovate to oblong, apex obtuse; lateral sepals ca. 6 × 1.5 mm , oblong to lanceolate, connate at the base, apex acute; petals 6 × 3 mm , oblong to lanceolate, sub-falcate, apex obtuse; labellum ca. 11 × 10 mm , widely obovate, whitish to pale pink, with dark purple oblique lines and a yellow callus at the base, apex deeply emarginate; callus ca. 3 mm long. Column ca. 2 mm long, clavate, clinandrium with entire margins; pollinia 2, yellow. Fruit not seen. FIGURE 1. Ionopsis × atalibae . A. Habit. B. Flowers. C. Perianth parts. D. Labellar callus. E. Column in side view. F. Column in ventral view. G. Dorsal view of the anther cap. H. Ventral view of the anther cap. I. Pollinarium. Photographed by A. H. Krahl. FIGURE 2. Comparison between I. × atalibae (A–C), I. satyrioides (D–F) and I. utricularioides (G–I). FIGURE 3. Ionopsis satyrioides (right) and I. utricularioides (left) occurring in sympatry in the population studied. Note both species growing on the same phorophyte. Etymology: —the specific epithet honors Antônio Ataliba Félix, father of Francisco Clóvis Lima Félix, an orchid collector from Manaus ( Amazonas , Brazil ) who found the studied population. Additional specimens examined: — Paratype : BRAZIL . Amazonas : Iranduba , Road AM-070, 3 ° 11’33.10”S , 60 ° 12’24.59”W , 0 m a.s.l., 06 July 2019 ,epiphyte on Citrus tree, A . H . Krahl & F . C . L. Félix 1281 ( LBMBP ) . Specimens of I. satyrioides examined: — BRAZIL . Amazonas : Iranduba , Road AM-070, 3 ° 11’33.10”S , 60 ° 12’24.59”W , 0 m a.s.l., 06 July 2019 , epiphyte in Citrus tree, A . H . Krahl & F . C . L . Félix 1276 ( LBMBP ); ibid., A . H . Krahl & F . C . L . Félix 1277 ( LBMBP ); ibid., A . H . Krahl & F . C . L . Félix 1278 ( LBMBP ); ibid., A . H . Krahl & F . C . L . Félix 1279 ( LBMBP ); ibid., 28 July 2019 , A . H . Krahl 1294 ( INPA 288760 ); ibid., A . H . Krahl 1295 ( INPA 288759 ) . Specimens of I. utricularioides examined: — BRAZIL . Amazonas : Iranduba , Road AM-070, 3 ° 11’33.10”S , 60 ° 12’24.59”W , 0 m a.s.l., 06 July 2019 , epiphyte in Citrus tree, A . H . Krahl & F . C . L . Félix 1272 ( LBMBP ); ibid., A . H . Krahl & F . C . L . Félix 1273 ( LBMBP ); ibid., A . H . Krahl & F . C . L . Félix 1274 ( LBMBP ); ibid., A . H . Krahl & F . C . L . Félix 1275 ( LBMBP ); ibid., 28 July 2019 , A . H . Krahl 1292 ( INPA 288761 ); ibid., A . H . Krahl 1293 ( INPA 288762 ) . Distribution and habitat: —The new hybrid was collected in the municipality of Iranduba in the km 15 of the Road AM-070, between the municipality of Manaus and Manacapuru. Phenology: —The flowering period of I. × atalibae occurs from July to August. Ionopsis utricularioides flowers from May to October, while I. satyrioides flowers from June to December. The flowering period of the sympatric parental species overlaps in the study area. Morphological affinities: —The new hybrid possesses intermediate morphology between both parental species. The leaf disposition and shape are reminiscent of those of I. utricularioides . The leaves are deeply curved to supervolutecurved, and thick. The labellum is widely obovate ca. 11 × 10 mm , whitish to pale pink with dark purple oblique lines, apex deeply emarginate ( Table 1 ). As in I. utricularioides , the inflorescence of the hybrid is branched. However, it produces less flowers than I. utricularioides but more than I. satyrioides ( Table 1 ). The size and shape of the hybrid flowers is intermediate between I. utricularioides and I. satyrioides ( Table 1 , Fig. 2 ).