Accepted name: Dendrochilum dulitense Carr, Gard. Bull. Straits Settlem. 8: 84 (1935)



Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Brunei and Sarawak

 

Elevation in the Wild

 

1200-1400 metres

 

Habitat in the Wild

 

This species has been found in Brunei and Sarawak. In Brunei it has been collected on Mount Retak. In Sarawak this species has been collected on Pantoh Hill within the South East section of the Hose Mountains and on Mount Dulit’s Dulit Ridge.

 

Jeffrey Wood described the habitat as lower montane mossy forest and as an epiphyte amongst moss in Rhododendron/Cyathea 2-4 metres high on sandstone ridges. The Kew isotype was found on a small tree in mossy forest (Wood 2001).

 

The Plants Description

 

The pseudobulbs crowd along a rhizome that grows to 3cm long. The pseudobulbs are shaped ovoid or subglobose. The pseudobulbs measure 0.3-0.6cm long and 0.3cm in diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 2-5mm long. The leaf blades are shaped linear ligulate and have obtuse apices. The leaf blades measure 1.8-3.4cm long and 0.2-0.3cm wide. The leaves have 5 distinct nerves and are coriaceous.

 

The Inflorescence

 

The inflorescence is synanthous and grows with the subtending leaf before it expands. The peduncle is erect and measures 1.2-2.5cm long. The rachis is quadrangular in cross section, pale pinkish, pendent and measures 2.5-3.0cm long. The flowers alternate distichously and are spaced 4-7mm apart. There are no non-floriferous bracts at the base of the rachis.

 

The Flowers

 

Jeffrey Wood wrote (2001) that between 6 and 8 flowers grow on an inflorescence. Wood also wrote that the flowers are translucent pale salmon-pink or orange ochre. The labellum is pale or dull yellow or orange ochre with a creamy margin. The column is dull peach or orange ochre and the stelidia are yellow ochre. The sepals and petals spread widely and are papillose at their base. The dorsal sepal is shaped narrowly ovate-elliptic and has an acute to acuminate apex. The dorsal sepal measures 5-5.5mm long and 1.5-2mm wide. The dorsal sepal has an entire margin and is 3-veined. The lateral sepals are shaped narrowly ovate-elliptic and have acute to acuminate apices. The lateral sepals measure 5.5-6.2mm long and 1.8-2.5mm wide. The lateral sepals have entire margins and are 3-veined. The petals are shaped narrowly ovate and have long acuminate apices. The petals measure 4.7-5.0mm long and 1.3-1.8mm wide. The petals are 1 veined and have minutely uneven to erose margins. The labellum is obscurely 3-lobed, stipitate to the column foot by a narrow claw and 3-veined. The labellum measures 4.3-5.0mm long, 2.9-3.0mm wide at its base and 3.7-4.0mm wide across the mid-lobe. The side lobes are ill defined; shaped triangular and have subacute apices. The side lobes margins are irregularly erose. The mid-lobe is shaped transversely elliptic and has a rounded apex. The mid-lobe margins are entire. There are two short keels that run from the base of the hypochile and terminate at or just past the start of the mid-lobe; the keels are joined at the base to a median elevated nerve. The column is incurved and measures 2.8-3.1mm long. The column foot is prominent. The apical hood is shaped ovate-triangular and has an obtuse and entire apex. The stelidia grow up and outwards from just above the base of the column. The stelidia do not reach the apex of the apical hood or the anther cap but terminate just below the stigmatic cavity. The stelidia measure 0.9mm long, are shaped oblong-spathulate and have rounded to truncate apices.

 

Herbarium Specimens

 

Holotype

 

SING

 

Isotype

 

Royal Botanic Gardens Kew (K)

 

Specimen K000078906 (photo)

 

Other herbarium specimens

 

E

 

SAR

 

BRUN

 

National Herbarium Netherlands (L)

 

I could not locate the specimen

 

Royal Botanic Gardens Kew (K)

 

Specimen 60413.000

Specimen 60412.000

 

Scent

 

The flower is reported to be unscented.

 

Flowering Season

 

Flowering plants have been collected in the wild during August and September in Sarawak and during March in Brunei.

 

Culture

 

I do not think this species is in general cultivation. This species is grown in the Hortus Botanicus at Leiden in the Netherlands.

 

Similar Species

 

Dendrochilum ochrolabium (please see this page for the differences)

 

Other Information

 

This species can be distinguished better by looking at the shape of the stelidia.

 

Reference

 

BEAMAN, Teofila, WOOD, Jeffrey, BEAMAN, Reed, BEAMAN, John. 2001, Orchids of Sarawak, Natural History Publications Borneo, 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.