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Pygmy tree orchid, Bulbophyllum
Current Threat Status
2012 - Not Threatened
Previous Threat Status
2009 - Not Threatened
2004 - Not Threatened
Bulbophyllum pygmaeum (Sm.) Lindl.
Vascular - Native
Ichthyostomum pygmaeum (Sm.) D.L.Jones, M.A.Clem. et Molloy
Endemic. Three Kings, North, South, Stewart Islands.
Coastal to montane. Mostly epiphytic on forest tree trunks and branches, sometimes on fallen logs, and found as a also rupestral on rocks, cliff faces or banks.
Epiphytic or rupestral, rhizomatous, perennial forming widely spreading or diffuse mats up to 200 mm or more in diameter. Rhizomes heavily branched and intertwined, vermiform, pale pink to white, more or less fleshy, spongy; roots numerous slightly finer than rhizomes otherwise every similar. Pseudobulbs 3-5 mm diameter, green, bright green to pale green, globose, rugose, becoming deeply furrowed and wrinkled with age; each bearing a single leaf arising from the top within a somewhat prominent circular rim. Leaf subsessile to shortly petiolate up to 1.5 mm long; lamina 4-10 x 2-4 mm, dark green to green (rarely reddish green), oblong-ovate to almost orbicular, apex obtuse, upper surface minutely scabrid; undersides prominently keeled. Flower solitary, located on the terminus of a greenish valvate capsule comprising the ovary; peduncle arising from base of pseudobulb, up to 2.5-3.5 mm long at flowering, usually elongating in fruit. Floral bract 1(-2), campanulate-tubular to funneliform, membranous, hyaline or pale white. Pedicel very short (0.5-0.7 mm long), coarsely hirsute; ovary ovoid-ellipsoid, coarsely hirsute, splitting lengthwise at dehiscence. Perianth 1.5-2.0 mm long, white. Sepals minutely hairy, dorsal sepal shorter than lateral sepals. Petals broad, almost meeting behind column. Labellum ovate-oblong, obtuse, more or less thickened, roofing over pouch formed by lateral sepals and column foot. Column barely as long as its foot; wing not exceeding anther.
Bulbophyllum pygmaeum could be confused with B. tuberculatum but that species has a less diffuse, more compact growth habit; much larger dark green to maroon green, erect, ovoid to ovoid-ellipsoid pseudobulbs; larger and longer, linear-oblong leaves (up to 50 x 5 mm), usually more than one flower; and flowers which have orange to red labella, and white or pale cream petals and sepals. The leaves and ovary of B. tuberculatum lack the minute, coarse hairs that are a feature of B. pyhmaeum. The ovary of B. tuberculatum does not at maturity split to become valvate, nor does it retain the flower remnants on the uppermost valve.
December - January
Main Flower Colour
Other Flower Colour
January - May
Easily grown in a hanging basket in standard orchid mix. Often can be strapped to a tree trunk and provided it is kept moist during the drier months it grows readily. This species does best in semi-shade. Should not be removed from the wild
2n = 38
Where To Buy
Not commercially available.
The generic distinction of Ichthyostomum from Bulbophyllum was always considered unclear and many botanists did not accept the division. Recently Australian orchidologists have rejected this genus and returned to a broader circumscription of Bulbophyllum (P. Weston pers. comm. 2014), this view is accepted here
References and further reading
Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. II. Government Printer, Wellington.
Thorsen, M. J.; Dickinson, K. J. M.; Seddon, P. J. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285-309
This page last updated on 30 May 2015