Oncidium X cassolanum V. P. Castro & Campacci hibr. nat. nov.
A new Oncidium hybrid in the section Walueva found in the south region of Brazil
    Photo: Vitorino Castro Neto

Diagnose Latine: Herba hybrida naturalis inter Oncidium riograndense Cogn. et Oncidium cornigerum Lindl. Floribus medis inter haec species.

  Type: Brazil - Rio Grande do Sul, in "Vale dos Sinos", near to Novo Hamburgo city.
Collector: (Who found the plant) Oswaldo Cassola, 1990. This species bloomed in cultivation in 1991 and the following years.
Holotypus: SP

Plant epiphyte, with caespitosus growing, natural hybrid between Oncidium riograndence Cogn. and Oncidium cornigerum Lindl. Vegetative characteristic: inflorescence and flowers similar to the progenitor. Flowers: sepals, petals and lip are yellow with brown blotches, color varies from one specimen to another. Dorsal sepal is elliptic-lanceolate, 14,0mm long and 6.0mm wide. Lateral sepals: 14,0mm long and 6,0mm wide, with agglutinated synsepalous base. Petals: oblong-lanceolate, 15,0mm long et 7,0 wide. Lip: trilobated, 12,0mm long and large when distends, with a complex callus that varies between the 2 species that originated the hybrid; In the analyzed specimen, the callus is formed from the base, by a sequence of superposed chestnut brown plaques; then there are two small yellow corns turned towards the tip; between the lateral lobes of the lip, there are 2 divergent elevated masses and then, between those elevated masses and towards the mid-lobe, there is a mass of small dissociated warty calli. There is no callus in the mid-lob (a characteristic of Oncidium cornigerum). Column:auriculate, pilosus (hairy) at the base and at the wings; 5,0mm long, yellow with brown blotches in the wings. Anther : yellow, 2,0mm long. Pollinia :2, yellow, long caudicle, 2,0mm long.

Distribution: State of Rio Grande do Sul - Brazil

Other regions: State of de Santa Catarina - Brazil and recently it was also found in the region of Missiones in Argentine.

Habitat: Humid forests of "Vale dos Sinos" in altitude above 300m.
Etymology: To pay homage to Mr. Oswaldo Cassola, already dead, who discovered this natural hybrid at the beginning of the 90 years.

Observations: The specimen used for the description and the holotypus has been given for Mr. Paulo Strumiello to us. We thank him very much.

Discussion: It is evident that concerning a natural hybrid, the specimen should take the intermediate characteristic of the ascendants, Oncidium riograndense Cogn and Oncidium cornigerum Lindl., Those species are found in the same region and bloom at the same time, thus the hybridization.

Photo: Vitorino Castro Neto

Rua Vicente Galafassi, 549 - 09770-480 - S. B. do Campo, SP - E-mail: vpcastro@terra.com.br
Caixa Postal 13207 - 03104-970 - São Paulo - SP - E-mail: campacci@sili.com.br