Name: Bulbophyllum costatum

Synonym of: Bulbophyllum membranifolium subsp. membranifolium

Origin: Philippines

First described: 1920 by Ames

Description: Bulbophyllum costatum is an epiphytic orchid species native to the tropical regions of the Philippines. Taxonomically, it is often treated as a synonym of Bulbophyllum longiflorum. In its natural habitat, the species grows as a climber in shady areas.

The plant has small, almost cylindrical to conical pseudobulbs arranged at short intervals along a creeping rhizome. Each pseudobulb bears a single leathery to thin, oblong to elliptical leaf at its tip. The leaves grow upright and have a simple, entire margin.

The inflorescence emerges from the base of the mature pseudobulbs and grows horizontally to upright. The distinctive flowers are notable for their striking shape, with the lateral sepals often greatly elongated, giving them a slender, tubular appearance. Their colors are usually subtle shades of yellow, cream, or red, often with fine stripes or spots.

In cultivation, this species thrives in a shady location with indirect light. A well-draining medium rich in coarse materials such as bark and perlite is recommended, or alternatively, the plant can be mounted on a suitable support such as cork to replicate its natural epiphytic conditions.

Water regularly so that the medium remains moist without becoming waterlogged. The species prefers warm to intermediate temperatures and high humidity combined with continuous air circulation. Light, year-round fertilization with a weak nutrient solution supports healthy growth.