<i>Catasetum krahlii</i> (Orchidaceae, Catasetinae): a new and threatened species from the Brazilian Amazon

Krahl, Dayse Raiane Passos; Oliveira, Miguel Sena de; Silva, João Batista Fernandes da; Chiron, Guy; Cantuária, Patrick de Castro

doi:10.1590/1677-941X-ABB-2022-0258

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Original article • Acta Bot. Bras. 37 • 2023 • https://doi.org/10.1590/1677-941X-ABB-2022-0258 copy

Catasetum krahlii (Orchidaceae, Catasetinae): a new and threatened species from the Brazilian Amazon

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

In the present study we propose a new Catasetum taxon belonging to the group of species with symmetrical and converging antennae. It was found in a vegetation of “terra firme” and “campinarana” in the central Brazilian Amazon. A detailed description of the taxon is given as well as a photograph plate and comments relating to distribution, habitat, phenology and conservation status. It is compared to C. rivularium and C. barbatum which are sympatric species and somewhat similar to the new taxon. Furthermore, we present a key to Catasetum species with symmetrical and convergent antennae occurring in the Brazilian Amazon.

Keywords:
Amazon basin; biodiversity; Manaus; orchid; epiphyte; taxonomy

Characters	C. krahlii ¹	C. rivularium ^2,3,4,9	C. barbatum ^{4, 5, 6, 7, 8, 9}
Inflorescence	Suberect, 20.5-27.6 cm long, 6-12-flowered	Suberect or arched, 10-20 cm long, 4-15-flowered	Suberect or arched, 15-60 cm long, with up to 20 flowers
Pedicel	2.2-2.7 cm long, purplish	ca. 1.5 cm long, greenish	ca. 1.4 cm long, green and slightly purplish
Dorsal sepal	2.6-2.8 × 0.7-0.8 cm, elliptic	ca. 2.3 × 0.8 cm, oblong	2.3-3.2 × 0.6-0.9 cm, lanceolate
Lateral sepals	2.5-2.8 × 0.8-0.9 cm, elliptic, symmetrical	ca. 2.1 × 0.9 cm, oblong, asymmetrical	2.1-3.2 × 0.7-0.9 cm, lanceolate, symmetrical
Petals	2.2-2.3 × 0.5-0.6 cm, elliptic, symmetrical	ca. 1.9 × 0.7 cm, lanceolate, asymmetrical	2.2-3.1 × 0.4-0.8 cm, lanceolate, symmetrical
Lip	1.3-1.6 × 0.4-0.5 cm, 0.4-0.5 cm deep, oblong, the margin with rather short, thick and spaced fimbriae apically fused to form a “V”; inner surface glabrous forming a light trough	1.2 × 1.2 cm, 0.4 cm deep, widely triangular, the margin with rather thin fimbriae concentrated at apex; inner surface partially glabrous with fimbriae concentrated in the distal portion	1.5-3 × 0.3-1.5 cm, 0.3 deep, oblong to oblong triangular or subtriangular, margin with dense fimbriae relatively long, thin, congested, simple and usually fringed at apex; inner surface densely fimbriated and flat
Basal callus of the lip	Oblong, falcate, acute (claw-shaped), with a set of 2-3 small lateral horns	Cylindrical apically laciniate	3-dentate, central segment falcate, larger and more evident
Apical callus of the lip	Absent	Absent	1-2-dentate
Column	1.8-2.2 cm long	ca. 1.8 cm long	1.4-1.7 cm long
Antennae	Symmetrical converging, 0.5-0.6 cm long	Symmetrical converging, ca. 0.5 cm long	Parallel symmetrical, ca. 0.7 cm long

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E-mail: acta@botanica.org.br

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[1] * Corresponding author: dayseraiane@hotmail.com