Accepted name: Dendrochilum magaense J.J.Wood, Orchid Rev. 102: 147 (1994)



Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sabah

 

Elevation in the Wild

 

1400-1500 metres

 

Habitat in the Wild

 

This plant has been collected above the Maga River northwest of Long Pa Sia in Sipitang District and along a ridge east of the Maga river, 1.5km south of the confluence with the Long Pa Sia River.

 

Jeffrey Wood described the habitat as Oak/chestnut ridge forest amongst Agathis borneensis. A specimen was found growing in open and low dry stunted forest 5-10 metres high, with a dense field layer of terrestrial orchids and other herbs, on a narrow sandstone ridge (Wood 2001).

 

The Plants Description

 

The pseudobulbs crowd along a 2cm long rhizome. The pseudobulbs are shaped ovoid-elliptic and measure 0.8-1.2cm long and 0.2-0.5cm wide. The pseudobulbs are an olive-green colour. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls disintegrate into fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.6-1.8cm long. The leaf blades are shaped ligulate and have obtuse apices that are also apiculate. The leaf blades measure 3.0-7.5cm long and 0.3-0.4cm wide. The leaves are thin textured, are papillose along their margins towards the apex and have 3 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous and emerges from the nearly fully expanded leaf. The peduncle is gently curved and measures 3.0-5.0cm long. The rachis is quadrangular in cross section, nodding to pendent and measures 2.0-3.8cm long. The flowers are spaced 3-4mm apart. There are 2-3 non-floriferous bracts at the base of the rachis.

 

The Flowers

 

Between 4 and 8 flowers grow on an inflorescence (Wood 2001). The flowers are salmon cream to buff; or cream with orange to pale ochre centre sepals and petals with a pale orange to ochre centre to labellum (Wood 2001). The sepals and petals spread widely. The dorsal sepal is shaped oblong-elliptic and has an acute apex. The dorsal sepal measures 7.2-7.3mm long and 2.2-2.3mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped oblong-elliptic and have acute apices. The lateral sepals measure 7.5mm long and 2.4-2.5mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped irregularly elliptic and have obtuse and mucronate apices. The petals measure 6.5mm long and 2.5-2.6mm wide. The petals are three veined and have minutely erose margins. The labellum is stipitate to the column foot by a short claw, 3-nerved and 3-lobed. The labellum measures 4.9-5.0mm long and 2.0mm wide across the side lobes. The side lobes are shaped triangular and have acuminate apices. The side lobes have irregular, serrate to lacerate margins. The mid-lobe is shaped broadly elliptic from a cuneate base and has a rounded apex. The margins of the mid-lobe are slightly irregular. There are two low and fleshy keels than terminate at the base of the mid-lobe. There is a non elevated median nerve the joins the keels basally in an M shape. The column is incurved and measures 3.5mm long. The column foot is prominent. The apical wing is prolonged into an oblong shape and has a bifid and recurved apex. The stelidia grow outwards and upwards from the base of the column. The stelidia are shorter than the column apex and just reach the base of the apical wing. The stelidia are shaped acicular and have acute apices; the stelidia measure 2mm long.

 

Herbarium Specimens

 

Holotype

 

Royal Botanic Gardens, Kew (K)

 

Specimen K000079127 (photo)

 

Isotype

 

NA

 

Other herbarium specimens

 

National Herbarium Netherlands (L)

 

Specimen L0322637

 

Royal Botanic Gardens, Kew (K)

 

Specimen 51005.000

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild during October.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum tenompokense

 

Other Information

 

This species differs from Dendrochilum tenompokense by its larger flowers, shorter rachis, basal stelidia and bifid apical hood.

 

Jeffrey Wood wrote (2001) that he expected this species to grow on mountains in nearby Sarawak and Brunei.

 

The epithet refers to the Maga River.

 

Reference

 

WOOD, Jeffrey. 1997, Orchids of Borneo volume 3. The Sabah Society, Kota Kinabalu, Malaysia.

 

WOOD, Jeffrey. Dendrochilum of Borneo, 2001. Natural History Publications (Borneo), Malaysia.

 

World Checklist of Selected Plant Families. 23 July 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 23 July 2009.