Catasetum × aripuanense Bicalho (1963: 1)

Krahl, Dayse Raiane Passos, Schmal, Philippe, Chiron, Guy, Silva, João Batista Fernandes Da, Krahl, Amauri Herbert & Cantuária, Patrick De Castro, 2023, Catasetum × grasineideae (Orchidaceae: Catasetinae), a new nothospecies from Brazilian Amazon and taxonomic notes for the genus, Phytotaxa 594 (2), pp. 89-104 : 96

1. Catasetum × aripuanense Bicalho (1963: 1) (pro. sp.), nothosp. nov.

( Figure 6A–B ).

Type:— BRAZIL. Mato Grosso: Aripuan ã, mata ciliar do Rio Juruena, perto da Cachoeira Dois Irm ã os, cultivada no Jardim Botânico de S ã o Paulo , 15 May 1963, M. Mee s/n (holotype: SP-68441, photograph!) .

Taxonomic Note: —Based on controlled crossing and germination in vitro carried out by J. Fernández G. this taxon proved to be a natural hybrid between C. gladiatorium Lacerda (1998: 90) and C. rooseveltianum Hoehne (1916: 35 , t. 172). Phenotype resulting from the crossing of these species ( Figure 6A–B ) was compared to the original description given by Bicalho (1963) and the holotype deposited in herbarium SP. The same morphological features were observed. In addition, two materials deposited in SP and ESA were analyzed and, once more, the same floral morphology was observed. It is also emphasized that both parental species occur in the state of Mato Grosso, as C. × aripuanense (see Bicalho 1963, Petini-Benelli 2022), which strengthens the possibility of hybridation.

Catasetum × aripuanense presents an ovate lip as in C. rooseveltianum (vs. trapezoidal in C. gladiatorium ), with at base a tripartite callosity similar to that of C. gladiatorium (vs. absent in C. rooseltianum ) and the margins are dentate to fimbriate (a character intermediate between C. gladiatorium , that has a fimbriate margin, and C. rooseveltianum , that presents a smooth margin). Moreover, the column in C. × aripuanense presents parallel antennae as in C. gladiatorium (vs. parallel and divaricate in C. rooseveltianum ) (see Bicalho 1963, Petini-Benelli 2022).

Additional specimens examined:— BRAZIL. Mato Grosso: Aripuan ã, mata ciliar do rio Juruena perto da cachoeira Dois Irm ã os, 07 august 1962, M. Whitten 93112 (SP-175250, photograph!) ; Mato Grosso do Sul: Costa Rica , 02 january 1997, A.P. Santo s/n (ESA-108221, photograph!) .

Figures

FIGURE 6. Hybrid Catasetum. A–B. C. × aripuanense. C. C. × dalastranum. D. C. × fergusonii. E–F. C. × mojuense. G–H. C. × yarigii. Photos A–B, D and G–H by J. Fernández G., C by F. Godoy and E–F by E. Pontes.