Mediocalcar pygmaeum is an epiphytic species of orchids in the genus Mediocalcar that is endemic to New Guinea.

It has red, orange or orange-yellow coloured flowers with yellow, yellowish green or green tips.

The pseudobulbs are a yellowish green colour with olive-green leaves.

Found in cool montane forest at altitudes of 1,200 to 2,850 m (3,940 to 9,350 ft).

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