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This species is accepted, and its native range is Brazil (Espírito Santo, Minas Gerais, Rio de Janeiro).

[KBu]

De Brito, A. (2007). A Taxonomic Revision of the Genus Phymatidium (Orchidaceae: Oncidiinae). Kew Bulletin, 62(4), 529-560. Retrieved from http://www.jstor.org/stable/20443388

Distribution
Brazil: Espírito Santo.
Ecology
Epiphytic on trees near river margins in Atlantic cloud forest at higher altitudes. Alt. c. 1850 m.
Morphology General Habit
Plant up to c. 35 mm tall
Morphology Leaves
Leaves many, up to c. 25 x 1 mm, slightly falcate, somewhat ensiform, shortly and slightly sheathing at base, twisted, 3-angled almost to the middle, laterally flattened towards the apex, acute
Morphology Reproductive morphology Flowers
Flowers not resupinate, white with green tabula infrastigmatica and callus of the lip (fide original description)
Morphology Reproductive morphology Flowers Calyx
Lateral sepals similar in size and shape to the dorsal one; margins slightly sinuate Dorsal sepal c. 4 x 1 mm, lanceolate to oblong-lanceolate, somewhat falcate, slightly concave, acute, abaxially weakly carinate
Morphology Reproductive morphology Flowers Column
Column c. 2.5 mm long (excluding the tabula infrastigmatica), incurved, slightly sigmoid, sulcate underneath, slightly thicker towards the base, usually obscurely recurved near the apex, auriculate; the auricles densely papillose, obtuse, somewhat broadly ovate when spread, running from approximately the same level as the rostellum up to the apex of the column; stigmatic cavity small, ovate, placed at the base of the column; rostellum small, slightly curved forwards; tabula infrastigmatica c. 1 x 0.5 mm, thick, somewhat obovate from above, laterally sulcate, with a slightly raised, flattened, elongate, elliptic callus slightly curved upwards towards the apex; anther c. 1.5 mm long, operculate, somewhat panduriform in outline, clearly narrowly beaked, incurved towards the apex, very shortly recurved and emarginate at apex; pollinarium not seen
Morphology Reproductive morphology Flowers Corolla
Lip c. 4 x 2 mm, broadly lanceolate, acute; margins entire or slightly sinuate towards the apex; base with a glandular, concave, broadly ligulate callus Petals c. 4 x 1.2 mm, obliquely ovate-lanceolate, slightly falcate, acute; margins slightly sinuate
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary pedicellate, c. 6 mm long (fide original description)
Morphology Reproductive morphology Fruits
Capsule immature, c. 3 x 2 mm, subglobose to slightly pyriform, markedly 3-winged with alternating, usually less pronounced ridges, the pedicel c. 2.5 mm long.
Morphology Reproductive morphology Inflorescences
Inflorescences several, up to c. 35 mm long, few- to c. 8 flowered, racemose; peduncle up to c. 18 mm long, 3 angled in cross-section, glabrous, thickish, covered by several narrowly ovate to subulate, acute sterile bracts, up to c. 5 x 0.8 mm, abaxially slightly keeled; rachis up to c. 16 mm long, 3-angled in cross-section, flexuous, somewhat twisted, thickish; floral bracts similar to the sterile ones, decreasing slightly in size towards the apex of the inflorescence
Morphology Roots
Roots several, flexuous, terete, thickish, glabrous
Morphology Stem
Stem up to c. 10 mm long, erect, not branched
Note
I have been unable to locate the type of Phymatidium geiselii, a spirit collection at Museu Mello Leitão in Espírito Santo, Brazil. However, three unidentified spirit collections were found in this museum two years after the death of its director, A. Ruschi. These contained no information but were numbered as 26, 27 and 29. They were later correctly determined by the museum's staff as P. geiselii. All three specimens, which most probably have the same provenance as the type, have only immature fruits with flower remnants at apex, a feature also shown in Ruschi's drawing in the original publication of P. geiselii. With the exception of the tabula infrastigmatica, which seemed somewhat shrunk in the specimens examined, the floral segments were still found in a relatively good state and have been used as basis for the floral analyses and description provided in the present work. This species is related to Phymatidium delicatulum but can be readily distinguished by the shape of inflorescence, the distinctive floral morphology, especially shape of the lip, column, anther and tabula infrastigmatica, as well as by the markedly winged fruits. It is also related to P. glaziovii from which it differs in the shape of the tabula infrastigmatica, lip and fruits. It did not appear in Pabst & Dungs' Orchidaceae Brasilienses (1977) probably because by the time P. geiselii was published in 1976, the manuscript of Orchidaceae Brasilienses vol. 2 (1977) had already been sent to press.
Type
Brazil, Espírito Santo, Parque Nacional do Caparaó, Rio São Domingos, Várzea dos Congonhas (Macieira), 16 Aug. 1975, Albuquerque et al. s.n. (holotype MBML - spirit 6220, not located).

[KBu]

De Brito, A. (2007). A Taxonomic Revision of the Genus Phymatidium (Orchidaceae: Oncidiinae). Kew Bulletin, 62(4), 529-560. Retrieved from http://www.jstor.org/stable/20443388

Distribution
Brazil: Rio de Janeiro and Espírito Santo
Ecology
Epiphytic on trees in the Atlantic forest of Rio de Janeiro and Espírito Santo. Alt. 500 - 1500 m.
Morphology General Habit
Plant up to c. 70 mm tall, usually forming a dense intricate clump
Morphology Leaves
Leaves up to c. 40 x 1 mm, falcate, somewhat twisted, variable in cross-section in the same specimen and the same leaf, 3-angled, semi-terete, oval to semi-oval, slightly sheathing and shortly decurrent at base, apex acute
Morphology Reproductive morphology Flowers
Flowers not resupinate, not opening widely, with the petals and sepals curved forwards and with a spreading lip
Morphology Reproductive morphology Flowers Calyx
Dorsal sepal c. 3.5 x 0.7 mm, linear-lanceolate to narrowly ovate-lanceolate, usually somewhat falcate, slightly concave and hooded towards the base, acute, abaxially slightly carinate Lateral sepals c. 4 x 1 mm, linear-lanceolate to narrowly ovate-lanceolate, falcate, acute, abaxially slightly carinate
Morphology Reproductive morphology Flowers Column
Column 2 - 2.5 mm long (excluding the tabula infrastigmatica), incurved, sigmoid, slightly thicker towards the base and somewhat recurved at apex, auriculate; the auricles densely papillose, slightly semi-elliptic to semi-ovate when spread, running from the same level as the rostellum up to the apex of the column; stigmatic cavity small, ovate, placed at base of the column; rostellum short, curved forward; tabula infrastigmatica c. 1.5 x 0.5 mm, conspicuous, laterally excavated, nose-shaped in side view, elongate, narrowly obovate and flanked at base by a shorter thick lump on each side when seen from above, adaxially flattened, slightly sulcate at middle, shortly sagittate at base; anther c. 1.5 mm long, operculate, narrowly ovate in outline, incurved towards the apex, slightly beaked, the apex shortly recurved and emarginate; pollinia arranged in two superposed unequal pairs, the superior pair narrowly clavate, the inferior oblong-ellipsoidal to narrowly obovoid; stipe c. 1.5 mm long, somewhat obovate cuneiform, the base slightly curved, the apex subtruncate; viscidium small, ovate, concave
Morphology Reproductive morphology Flowers Corolla
Lip 4.7 - 5 x 2.7 - 3 mm, rhombic, convex, usually deflexed, somewhat unguiculate at base; margins entire and slightly involute towards the base, entire to weakly erose at middle, entire towards the apex; base provided with a glandular, deeply concave, somewhat broadly ovate callus; apex markedly acuminate Petal c. 3.7 x 1 mm, oblong-lanceolate to somewhat ovate-lanceolate, acute, abaxially slightly carinate
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary c. 1 mm long, slightly angled
Morphology Reproductive morphology Flowers Pedicel
Pedicel 2.5 - 3 mm long, slightly twisted and obscurely angled
Morphology Reproductive morphology Fruits
Capsule c. 2.5 x 1.5 mm, subglobose, slightly 3-angled in cross section, the pedicel c. 1 mm long.
Morphology Reproductive morphology Inflorescences
Inflorescences several, up to c. 110 mm long, up to c. 10 flowered, racemose; peduncle up to c. 45 mm, slightly angular in cross-section, covered by several, narrowly ovate, somewhat subulate sterile bracts, up to c. 6 x 0.7 mm, acute; rachis tip to c. 55 mm long, slightly flexuous, angular in cross-section; floral bracts similar to the sterile ones, decreasing in size towards the apex of the inflorescence
Morphology Roots
Roots many, terete, thickish, glabrous, flexuous
Morphology Stem
Stem up to c. 10 mm long, branched
Note
This species has been consistently confused with other species of Phymatidium. For example, Cogniaux identified Glaziou 3633 as P. hysterathum in the herbarium, but cited it under P. delicatulum and P. hysteranthum in his account in Martius' Flora Brasiliensis. Pabst has identified Dungs s.n. as P. mellobarretoi, and Kautsky s.n. as P. myrtophilum. Although quite variable in vegetative morphology, especially the length and the shape of the leaves, it is very uniform in floral morphology, particularly in column and lip shape. It is similar to P. geiselii but differs in the shape of the tabula infrastigmatica, lip and fruit. In P. glaziovii the tabula infrastimatica is slightly curved downwards towards the apex and distinctively nose-shaped in side view, the lip is rhombic with markedly acuminate apex, and the fruits are unwinged, while in P. geiselii the tabula infrastigmatica is elongate and slightly curved upwards towards the apex; the lip is broadly lanceolate, acute, and the fruit markedly 3-winged. Named after Auguste Francois Marie Glaziou (1828- 1906), French botanical traveller who first collected this species.
Type
Brazil, Rio de Janeiro, Glaziou 3633 (holotypus BR!, isotypus C!).

Native to:

Brazil Southeast

Phymatidium geiselii Ruschi appears in other Kew resources:

First published in Bol. Mus. Biol. Prof. Mello-Leitão, Nova Sér. 85: 1 (1976)

Accepted by

  • Giulietti & al. (2009). Plantas raras do Brasil: 1-496. Conservação International, Belo Horizonte, MG.
  • Toscano de Brito, A.L.V. (2007). A taxonomic revision of the genus Phymatidium (Orchidaceae: Oncidiinae) Kew Bulletin 62: 529-560.
  • Toscano de Brito, A.L.V., Royer, C.A. & de Camargo Smidt, E. (2016). Nomenclatural and taxonomic notes in Phymatidium geiselii (Oncidiinae, Orchidaceae) Lankesteriana 16: 13-19.

Literature

Kew Bulletin

  • Ruschi, A. (1976). Orquidáceas novas do Est. do Espírito Santo. Bol. Mus. Biol. Prof Mello -Leitão, Ser. Bot., 85: 1 - 4.

Kew Backbone Distributions

  • Toscano de Brito, A.L.V., Royer, C.A. & de Camargo Smidt, E. (2016). Nomenclatural and taxonomic notes in Phymatidium geiselii (Oncidiinae, Orchidaceae) Lankesteriana 16: 13-19.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0