Accepted name: Dendrochilum tuberculatum J.J.Wood & J.B.Comber, Lindleyana 10: 67 (1995)

Subgenus – Platyclinis. Section – Platyclinis.


 
 

Synonyms

 

None

 

Origin in the Wild

 

Sumatra

 

Elevation in the Wild

 

1600-1650 metres

 

Habitat in the Wild

 

This species was collected by Ed de Vogel, it was found growing as an epiphyte in primary forest and near the village of Tele on the west bank of Lake Toba. Another specimen was collected along the Merek to Sidikalang Road.

 

The Plants Description

 

The pseudobulbs are spaced 2.5cm apart along the rhizome. The pseudobulbs are shaped ovoid and are narrowed apically; the pseudobulbs are placed at right angles to the rhizome. The pseudobulbs measure 2.5cm long and 1cm in diameter. The leaves are petiolate, the petiole measures 1.5cm long. The leaf blades are shaped linear and have acute apices. The leaf blades measure 19cm long and 0.7cm wide.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle measures 10.5cm long. The rachis is 12cm long. The flowers are spaced 5mm apart.

 

The Flowers

 

More than 30 flowers are recorded growing on an inflorescence, are large and measure 1.28cm across. The flowers are yellow and have brown keels on the labellum. The sepals and petals all have tiny tubercles at their bases. The dorsal sepal is shaped lanceolate and has an acute apex. The dorsal sepal measures 7.2mm long and 2.4mm wide. The lateral sepals are shaped lanceolate and have acute apices. The lateral sepals measure c7.2mm long and 2.8mm wide. The petals are shaped narrowly lanceolate and have erose margins. The petals measure 6.6mm long and 1.7mm wide. The labellum is entire and measures 5.8mm long and 3.6mm wide at its apex. The labellum is shaped oval nearer to its apex and has an obtuse to minutely apiculate apex. The margin is erose at its base and entire at its apex; there is a distinct fold mid along the labellum. There are two keels that start at the base and nearly reach the apex. The keels are connected at the base by a transverse ridge, there is a third keel that starts from the transverse ridge and terminates a quarter of the length of the labellum. The column is curved and measures 3.7mm long. The apical hood is truncate and has an erose margin. The stelidia grow from the middle of the column and do not reach the apical hood. The stelidia are shaped lanceolate and have acute apices

 

Herbarium Specimens

 

Holotype

 

I could not locate the specimen

 

Isotype

 

Royal Botanic Gardens, Kew (K)

 

Specimen K000079138 (photo)

 

 

Other herbarium specimens

 

Royal Botanic Gardens, Kew (K)

 

Specimen 61489.000

 

Scent

 

I could find no record

 

Flowering Season

 

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

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum beccarii

 

Other Information

 

Jim Comber wrote that this species is similar to Dendrochilum beccarii but differs because (Comber 2001):

·         the pseudobulbs are spaced further apart

·         the inflorescence grows from developing rather than developed pseudobulbs

·         the sepals and petals are longer and have tubercles basally

·         the mid-lobe has an obtuse apex, not acute.

 

Reference

 

COMBER, J.B. Orchids of Sumatra, 2001, Royal Botanic Gardens Kew

 

World Checklist of Selected Plant Families. 17 November 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 17 November 2008.