Pomatocalpa macphersonii

Pomatocalpa macphersonii, commonly known as the blotched bladder orchid, is an epiphytic or lithophytic orchid with thick, cord-like roots, between two and eight dark green, leathery leaves and up to thirty cup-shaped, yellow flowers with red blotches and a white labellum with red blotches. It usually grows on rainforest trees and is found in New Guinea and tropical North Queensland, Australia.

Description

Pomatocalpa macphersonii is an epiphytic or lithophytic herb with a single main flattened stem, long and thick, cord-like roots. There are between two and eight dark green, thin, stiff oblong leaves long and wide.
Between three and thirty cup-shaped yellow flowers with red blotches, long and wide are borne on a stiff flowering stem long and hanging downwards. The sepals and petals are long, about wide. The labellum is white with a red blotches, long, wide with three lobes. The side lobes are erect and the middle lobe is fleshy and downturned with a spur about long. Flowering occurs from July to October.

Taxonomy and naming

The blotched bladder orchid was first formally described in 1870 by Ferdinand von Mueller as Saccolabium macphersonii. He published the description in Fragmenta phytographiae Australiae from a specimen collected by John Dallachy near Rockingham Bay in Queensland. In 1958 Trevor Hunt changed the name to Pomatocalpa macphersonii. The specific epithet honours John Alexander MacPherson.

Distribution and habitat

Plectorrhiza macphersonii usually grows on the trunks and large branches of trees in rainforest at altitudes up to. It is found in New Guinea and in Queensland on the Cape York Peninsula and as far south as Rockhampton.