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The orchid hybrid you mentioned, Bulbophyllum electrinum var. calvum x sib, is a cross between two varieties or clones of the species Bulbophyllum electrinum. Orchid hybridization is a common practice among orchid enthusiasts to create unique and potentially improved orchid varieties. Here's some information about each component:
Bulbophyllum electrinum: This is the species from which the hybrid originates. Bulbophyllum electrinum is known for its unique and striking flowers. It is native to New Guinea and can be found in its rainforests. The flowers of this species are typically yellowish-brown with intricate patterns and a lip that may have fine hairs or other interesting features.
Variety calvum: The "calvum" variety or clone of Bulbophyllum electrinum likely has specific characteristics that make it distinct from the typical form of the species. This could include variations in flower color, size, or shape, or other unique traits.
"x sib": The "x sib" designation indicates that this hybrid is derived from sibling plants of the specified varieties or clones. In orchid breeding, "sib-cross" means that the hybrid is created by crossing two different plants of the same parent species or variety, but not necessarily from the same seed pod.