Accepted name: Dendrochilum murudense (J.J.Wood) J.J.Wood, Dendrochilum Borneo: 228 (2001).



Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

Dendrochilum crassifolium var. murudense J.J.Wood in J.J.Wood & P.J.Cribb, Check-list Orchids Borneo: 166 (1994)

 

Origin in the Wild

 

Sarawak

 

Elevation in the Wild

 

2050-2400 metres

 

Habitat in the Wild

 

This species has only been collected in Sarawak in the Marudi District along the summit ridge of Mount Murud and on the second sandstone summit of Mount Murud.

 

The habitat has been described as upper montane mossy forest on sandstone (Wood 2001).

 

The Plants Description

 

The pseudobulbs cluster together along a rhizome that can measure up to 4cm long; the pseudobulbs are spaced 1cm apart. The pseudobulbs are shaped oblong-ovate or conical and measure 0.6-2.0cm long and 0.8cm in diameter. The pseudobulbs are covered by 2-3 cataphylls while they are growing. The cataphylls disintegrate into fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.8-1.5cm long. The leaf blades are shaped elliptic or oblong-elliptic and have obtuse and mucronate apices. The leaf blades measure 4.4-8.0cm long and 1.0-2.0cm wide. The leaves are thick, tough, coriaceous and have 5-7 distinct nerves along their length.

 

The Inflorescence

 

The inflorescence is synanthous and appears when the leaves have nearly or fully expanded. The peduncle is erect and measures 3.5-6.5cm long. The rachis is erect to gently curved and measures 16-20cm long. The rachis is quadrangular in cross-section. The flowers alternate distichously and are spaced 4.5-6.0mm apart. There are 1-3 non floriferous bracts at the base of the rachis.

 

The Flowers

 

The flowers are a greenish colour (Wood 2001). The dorsal sepal is shaped oblong-elliptic and has an acute to acuminate apex.  The dorsal sepal measures 9.0-10.0mm long and 2.1-2.8mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are shaped ovate-elliptic and have acute to acuminate apices. The lateral sepals measure 9.0-9.2mm long and 2.2-3.0mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped narrowly elliptic and have acuminate apices. The petals measure 8.0-8.1mm long and 0.9-2.1mm wide. The petals are three veined and have minutely erose margins. The labellum is stipitate to the column foot by a tiny claw, three nerved and 3-lobed. The labellum measures 6.6mm long and 2.0-2.1mm wide. The side lobes are shaped triangular and have acute to acuminate apices. The side lobe upper margins are erose to lacinulate. The mid-lobe is shaped elliptic and has an acuminate apex. The margin of the mid-lobe is minutely erose. There are two keels than terminate half way along the mid-lobe. The keels are joined at the base of the labellum by a ridge and have a flange on each side. There is an elevated median nerve that joins the keels basally to form an M shape. The column is incurved and measures 4.0-4.5mm long. The column foot is prominent and measures 0.5-1.0mm long. The apical hood is elongated, shaped oblong to elliptic and has a rounded apex. The margin of the apical hood is entire. The stelidia grow upwards from the base of the column and do not reach the column apex. The stelidia are shaped ligulate and have obtuse apices. The stelidia measure 2.0-2.5mm long.

 

Herbarium Specimens

 

Holotype

 

Royal Botanic Gardens Kew (K)

 

Specimen 60403.000 (Dendrochilum crassifolium var murudense)

Specimen K000079129 (photo)

 

 

Isotype

 

SAR

 

 

Other herbarium specimens

 

National Herbarium Netherlands (L)

 

Specimen L0269673

 

Royal Botanic Gardens, Kew (K)

 

Specimen K000395599

 

Scent

 

I could find no record.

 

Flowering Season

 

Flowering plants have been collected in the wild during April, August and September.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum crassifolium

Dendrochilum murudense (see this page for the differences)

 

Other Information

 

This species was considered to be a variety of Dendrochilum crassifolium; however Jeffrey Wood elevated it to species status in 2001. Wood wrote that this species is closely related to Dendrochilum crassifolium but differs by its slender column, fleshy obtuse basal stelidia and smaller leaves that are similar to Dendrochilum lewisii. The separation was based on these accounts. Jeffrey Wood wrote that he thought the flower was visited by a different pollinator because of the larger flowers (Wood 2001).

 

The epithet refers to the mountain it has been found on.

 

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.