Accepted name: Dendrochilum subulibrachium J.J.Sm., Bull. Jard. Bot. Buitenzorg, III, 11: 109 (1931)



Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sarawak and Kalimantan Timur

 

Elevation in the Wild

 

800-1730 metres

 

Habitat in the Wild

 

Plants have been collected from Kalimantan in the Kalimantan Timur Province on Long Petak. Plants within Sarawak have been collected in the Limbang District at Bario along the Pa Mario River and in the Marudi District in the Gunung Mulu National Park on Mount Mulu and along the trail from camp 3 to camp 4.

 

The habitat has been recorded as lower montane ridge forest and hill forest. This species is an epiphyte on tree trunks (Beaman et al 2001).

 

The Plants Description

 

The pseudobulbs crowd along a short rhizome that measures up to c3cm long. The pseudobulbs are shaped oblong-ovoid and measure 0.5-1.1cm long and 0.4-0.5cm wide. The pseudobulbs are covered by three  cataphylls while they are growing. The cataphylls disintegrate into fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.3-1.0cm long. The leaf blades are shaped linear and have obtuse apices. The leaf blades measure 2.5-6.5cm long and 0.1-0.4cm wide. The leaves have three distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous and grows from the nearly fully expanded leaf. The peduncle is gently curved and measures 5.0-9.0cm long. The rachis is quadrangular in cross section, arching to pendent and measures 3.0-9.0cm long. The flowers alternate distichously, are often flexuose and spaced 2.5-3.5mm apart. There are none or rarely one non-floriferous bract at the base of the rachis.

 

The Flowers

 

Between 9 and 28 flowers grow on an inflorescence, the flowers are pale greenish to yellow and have 2 brown steaks along the length of the labellum (Wood 2001). The sepals and petals are incurved. The dorsal sepal is shaped oblong-ovate and has an obtuse to acute apex. The dorsal sepal measures 3.7-4.1mm long and 1.4-1.5mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped obliquely oblong-elliptic or subovate oblong and have acute apices. The lateral sepals measure 3.7-4.0mm long and 1.5mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped narrowly ovate-elliptic and have acute to acuminate apices. The petals measure 3.5-3.9mm long and 1.0mm wide. The petals are 1-2 veined and have entire or sometimes slightly erose margins. The labellum is stipitate to the column foot by a short claw, three nerved and 3-lobed. The labellum measures 3.5-4.0mm. The side lobes spread, are shaped transversely quadrangular, truncate basally and acuminate at their apices. The side lobe margins are irregularly lacinulate. The mid-lobe is shaped obovate-truncate from a narrow cuneate base with a rounded apex. The margins of the mid-lobe are minutely erose towards the apex. There are two prominent keels than terminate at the base of the mid-lobe, the keels are joined at the base. There is a non elevated median nerve that joins the keels basally to form an M shape. The column is incurved and measures 2.0-2.5mm long. The column foot is prominent. The apical wing is prolonged into an entire, obtuse and recurved apex. The stelidia grow upwards from the above the base of the column. The stelidia are shorter than the column apex and reach the rostellum. The stelidia are shaped linear-subulate and have acute apices; the stelidia measure 1mm long.

 

Herbarium Specimens

 

Holotype

 

National Herbarium Netherlands, (L)

 

Specimen – I could not locate the specimen

 

 

Other herbarium specimens

 

Royal Botanic Gardens, Kew (K)

 

Specimen 43220.000

Specimen 60755.000

 

National Herbarium Netherlands (L)

 

Specimen L0322759

 

SING

 

SAR

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild from August to October.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

NA

 

Other Information

 

The epithet refers to the sharp pointed stelidia.

 

Jeffrey Wood wrote that Dendrochilum magense is closely related (Wood 2003).

 

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.

 

WOOD, Jeffrey. 2003, Orchids of Borneo volume 4. The Sabah Society, Kota Kinabalu, 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.