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This species is accepted, and its native range is Brazil (Espírito Santo to Rio Grande do Sul).

[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 Grande do Sul, Santa Catarina, Paraná, and Rio de Janeiro. Menini Neto et al. (2003) reported this species for Minas Gerais.
Ecology
An epiphyte on trees in wet places in Atlantic forest. Also found in disturbed and cultivated areas, especially on garden shrubs and trees. Alt. 300 - 1500 m.
Morphology General Habit
Plant up to c. 25 mm tall, usually forming a small clump
Morphology Leaves
Leaves up to c. 30 x 1 mm, falcate, somewhat twisted, variable in cross-section both within the same specimen and leaf, 3-angled, semi-terete, oval to semi-oval, slightly sheathing and shortly decurrent at base, the apex acute
Morphology Reproductive morphology Flowers
Flowers usually resupinate, with spreading segments, usually with a white green column and callus on the lip, the latter having been reported to turn green after pollination
Morphology Reproductive morphology Flowers Calyx
Lateral sepals 3.5 - 5 x 1 mm, obliquely oblong-lanceolate, falcate, somewhat waved and recurved, acute, abaxially slightly carinate Dorsal sepal 3.5 - 5 x 0.7/ - 1.3 mm, linear, oblong-lanceolate or narrowly ovate lanceolate, usually slightly recurved, acute, abaxially slightly carinate
Morphology Reproductive morphology Flowers Column
Column 2 - 2.5 mm long, lacking a tabula infrastigmatica, strongly sigmoid, slightly thicker towards the base, strongly incurved or geniculate at middle, and markedly recurved near the apex, sulcate underneath, very shortly auriculate at the level of the rostellum; auricles somewhat triangular when spread, curved outwards and back-wards; stigmatic cavity large, ovate, placed at base and occupying a third of the column; rostellum short but quite distinctive, usually deflexed or recurved and somewhat hooked, flanked at base by two small teeth; anther 2.5 - 5 mm long, operculate, long and distinctly beaked, incurved, with a small tooth on each margin near apex, somewhat acute to obtuse; pollinia arranged in two superposed unequal pairs, the superior pair clavate, the inferior somewhat obovoid; stipe c. 2.5 mm long, narrowly caudate-spathulate, incurved towards the base, the apex somewhat rounded to subtruncate; viscidium small, somewhat ovate and slightly concave
Morphology Reproductive morphology Flowers Corolla
Petal 3 - 4.5 x 1 - 1.7 mm, obliquely broadly lanceolate, somewhat spreading, slightly waved and recurved, usually with a hump on the mid-vein near the base, acute, slightly carinate abaxially Lip 4 - 5 x 2 - 2.5 mm, ovate-lanceolate, acute, deflexed; margins entire, somewhat waved; base provided with a large, thick, glandular within, concave, broadly ovate to somewhat rounded callus, the apex of which is usually emarginate or bidentate
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary c. 1.5 mm long, slightly angled
Morphology Reproductive morphology Flowers Pedicel
Pedicel c. 3.5 mm long, somewhat twisted, slightly angled, inconspicuosly papillose on the angles
Morphology Reproductive morphology Fruits
Capsule immature, c. 3 x 2.5 mm, slightly obconoidal, somewhat 3-angled in cross-section or slightly 3 keeled with alternating less pronounced ridges, the pedicel c. 3 mm long.
Morphology Reproductive morphology Inflorescences
Inflorescences several, up to c. 110 mm long, few to c. 10-flowered, racemose; peduncle up to c. 60 mm long, obliquely elliptic in cross-section, flexuous, covered by several, fleshy, falcate, narrowly ovate lanceolate to linear-subulate sterile bracts, up to c. 10 x 1 mm, acute, usually 3-angled in cross-section; rachis up to c. 50 mm long, usually zig-zag, obliquely elliptic 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, usually inconspicuous and branched at base
Note
Named after Sr. Francisco Aquino from Porto Alegre, Brazil, who collaborated with Schlechter's studies of the orchid flora of Rio Grande do Sul by sending him specimens for identification. Phymatidium aquinoi is similar in habit to P. hysteranthum, but can be readily recognised by its unique floral morphology. The petals usually possess a hump on the mid-vein, the base of lip is provided with a broadly ovate to somewhat rounded, usually emarginate or bidentate, thick callus, the strongly sigmoid column lacks a tabula infrastigmatica and has a large stigmatic cavity, and the unusually deflexed and recurved rostellum makes the viscidium apparently face towards the centre of the flower and the ventral part of the column. The long-beaked anther and the pollinarium with its long stipe are also distinctive. The specimens collected by Burger and Jürgens upon which Schlechter based his description were probably destroyed during the bombing of the Berlin Herbarium during the Second World War. As Schlechter provided no illustration in his publication, identification of this species relies upon interpretation of the original description.
Type
Types: Brazil, Rio Grande do Sul: near Torres, Burger (under Aquino 19) (syntype B †) & Santa Cruz, Herval de Baixo, Jurgens 74 (syntype B †).

Native to:

Brazil South, Brazil Southeast

Phymatidium aquinoi Schltr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Toscano de Brito, A. [279], Brazil 74480.000
Toscano de Brito, A. [318], Brazil 74584.000
Toscano de Brito, A. [960], Brazil 74485.000

First published in Repert. Spec. Nov. Regni Veg. Beih. 35: 101 (1925)

Accepted by

  • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Royer, C.A., Toscano de Brito, A.L.V. & de Camargo Smidt, E. (2014). O gênero Phymatidium (Orchidaceae: Oncidiinae) no estado do Paraná Rodriguésia; Revista do Instituto de Biologia Vegetal, Jardim Botânico e Estaçao Biologica do Itatiaya 65: 251-260.
  • Toscano de Brito, A.L.V. (2007). A taxonomic revision of the genus Phymatidium (Orchidaceae: Oncidiinae) Kew Bulletin 62: 529-560.

Literature

Kew Bulletin

  • Pabst, G. F. J. & Dungs, F. (1977). Orchidaceae Brasilienses, Vol. 2. Brucke-Verlag Kurt Schmersow, Hildesheim.
  • Pabst, G. F. J. (1953). Contribuição para o conhecimento das orquídeas de Santa Catarina e sua dispersão geográfica — I. Sellowia 5 (5): 39 - 93.
  • Schlechter, R. (1925). Die Orchideenflora von Rio Grande do Sul. Feddes Repert. Spec. Nov. Regni Veg. Beih. 35: 1 - 108.

Kew Backbone Distributions

  • Royer, C.A., Toscano de Brito, A.L.V. & de Camargo Smidt, E. (2014). O gênero Phymatidium (Orchidaceae: Oncidiinae) no estado do Paraná Rodriguésia; Revista do Instituto de Biologia Vegetal, Jardim Botânico e Estaçao Biologica do Itatiaya 65: 251-260.
  • Toscano de Brito, A.L.V. (2007). A taxonomic revision of the genus Phymatidium (Orchidaceae: Oncidiinae) Kew Bulletin 62: 529-560.

Herbarium Catalogue Specimens

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