Accepted name: Dendrochilum hologyne Carr, Gard. Bull. Straits Settlem. 8: 89 (1935)

Subgenus – Acoridium. Section – Acoridium.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sabah and Sarawak

 

Elevation in the Wild

 

1400-2400 metres

 

Habitat in the Wild

 

The type locality was on the Dulit Ridge on Sarawak’s Mount Dulit. Other specimens have been collected from the summit of Mount Murud in Sarawak and from Sabah’s Sipiting District on the Maligan to Long Pa Sia trail, the ridge between Maga River and Malabid headquarters.

 

Jeffrey Wood describes the habitat as Mossy, podsol forest or ridge top with Agathis borneensis and small rattan palms. Wood also wrote that this species has been collected from open and stunted forest with a dense undergrowth of terrestrial orchids and other herbs. Also found on narrow sandstone ridges (Wood 2001).

 

Carr wrote that “the plant was found growing in moss on the top of a peak and in moderate sun”

 

The Plants Description

 

This species is a terrestrial or partial epiphyte. The pseudobulbs cluster on a creeping rhizome. The pseudobulbs are shaped narrowly cylindrical and erect at an angle from the rhizome. The pseudobulbs measure 11-15cm long and 0.3-0.4cm in diameter. The pseudobulbs are covered by 3-6 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate, the petiole measures 1.3-2.3cm long. The leaf blades are shaped narrowly linear-lanceolate and have acute apices. The leaf blades measure 18-25cm long and 0.85-1.4cm wide.

 

The Inflorescence

 

The inflorescence is synanthous and appears from the apex of almost mature pseudobulbs. The inflorescence is free from the subtending leaf at the time of flowering. The peduncle is erect and measures 12.5-20cm long. The rachis is nodding to arching and measures 6-12cm long. The flowers alternate distichously and are spaced 2mm apart. There are 3-7 non floriferous bracts on the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The tepals are pale green or pale ochre and brownish at their bases, the labellum is pale green ochre at its centre, and the column is brown. The dorsal sepal is shaped oblong-elliptic and has a narrowly obtuse apex. The dorsal sepal measures 1.5-1.6mm long and 0.8-0.9mm wide. The dorsal sepal has an entire margin and is three veined. The lateral sepals are shaped oblong-ovate, sometimes somewhat falcate, and have obtuse to subacute apices. The lateral sepals measure 2.2-2.5mm long and 0.9-1.1mm wide. The lateral sepals have entire margins and are three veined. The petals are shaped narrowly oblong and have acuminate or acute apices. The petals measure 0.9-2.2mm long and 0.5-0.6mm wide. The petals have entire margins and are one veined. The labellum is porrect, 3-veined, concave and entire. The labellum measures 1.8-2.0mm long and 2.0mm wide. The labellum is shaped triangular-ovate or obliquely subquadrate shaped and has an obtuse to acute apex. The margins on the labellum are entire. There are 3 obscure keels that emerge from the base of the hypochile, the median keel is short. The lateral sepals are longer, incurved, narrowed in their middle and terminate 2/3 along the length of the labellum. The column is erect and measures 0.6-1mm long. There are no stelidia and no apical hood. The anther cap is minute and cucullate.

 

Herbarium Specimens

 

Holotype

 

SING

 

Isotype

 

AMES

 

Specimen 98765 (photo)

 

Royal Botanic Gardens Kew (K)

 

Specimen K000078146 (photo)

Specimen K000078145 (photo)

 

National Herbarium Netherlands (L)


Specimen L0052522 (photo)

 

Other herbarium specimens

 

Royal Botanic Gardens Kew (K)

 

Specimen 49095.000

 

National Herbarium Netherlands (L)

 

Specimen L0269606

Specimen L0269607

Specimen L0269608

 

Scent

 

No

 

Flowering Season

 

Flowering plants have been collected in the wild during September, October and December.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum auriculilobum (see this page for the differences)

 

Other Information

 

Carr wrote that this species was similar to Dendrochilum fuscescens and Dendrochilum lamellatum from Sumatra. These 2 species are now considered to belong to a different subgenus of Dendrochilum.

 

Jeffrey Wood wrote that in the original description Carr misleadingly described this species as having three rounded basal keels. Carr described this plant from dried material and Jeffrey Wood wrote that the alcohol preserved flowers show two obscure swellings on the labellum (1997).

 

The epithet refers to the column that lacks stelidia.

 

Reference

 

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

 

CARR, C.E. 1935, Gardeners. Bulletin. Straits Settlem. 8: 235

 

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. 09 January 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 09 January 2009.