Pomatocalpa marsupiale

Pomatocalpa marsupiale, commonly known as branched bladder orchid, is an epiphytic or lithophytic orchid that forms large clumps. It has many thick roots, branched stems, many strap-like, leathery leaves and up to many upward-facing green flowers with a cream-coloured or yellowish labellum. It usually grows on high on rainforest trees and is found between Sulawesi and tropical North Queensland, Australia.

Description

Pomatocalpa marsupiale is an epiphytic or lithophytic herb forming large clumps with a branched main stem, long and thick roots. There are many leathery, channelled yellowish green leaves, long and wide with their bases obscuring the stem.
Between fifteen and twenty green flowers, long and wide are borne on each branch of a flowering stem long. The sepals and petals spread widely apart from each other. The sepals are long, about wide and the petals are long and about wide. The labellum is cream-coloured or yellowish, long, wide with three lobes. The side lobes curve forwards and the middle lobe is short, thick and fleshy with a pear-shaped spur about long. Flowering occurs from November to May.
Branched bladder orchid is differentiated from the other Australian Pomatocalpa species, P. macphersonii, by its taller, upright stems, larger leaves, crowded flowers, flower color, and bloom time.

Taxonomy and naming

Branched bladder orchid was first formally described in 1889 by Friedrich Kraenzlin as Cleisostoma marsupiale. He published the description in Die Flora von Kaiser Wilhelms Land. In 1912 Johannes Jacobus Smith changed the name to Pomatocalpa marsupiale. The specific epithet is derived from the Latin word marsupium meaning "pouch", "bag" or "purse".

Distribution and habitat

Plectorrhiza marsupiale usually grows on tall trees open situations in rainforest. It is found in Malesia, the Solomon Islands, New Guinea and in Queensland on the Iron and McIlwraith Ranges at altitudes between.