Accepted name: Dendrochilum pulogense Ames, Philipp. J. Sci., C 4: 594 (1909)

Subgenus – Acoridium. Section – Acoridium.


 
 

Synonyms

Acoridium pulogense (Ames) Ames, Orchidaceae 7: 81 (1922).

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

2065 - 2500 metres

 

Habitat in the Wild

 

This species has been recorded growing as an epiphyte of mossy forest. Plants have been collected from Benguet Province on Mount Pulog and Mount Simakoko.

 

The Plants Description

 

The pseudobulbs cluster along a short rhizome. The pseudobulbs are shaped fusiform to ellipsoid and measure 0.3-1.6cm long. The pseudobulbs are covered by 3-5 cataphylls while they are growing. The cataphylls disintegrate into non-persistent fibres when the pseudobulbs mature. The leaves are petiolate, the petiole measures 0.3-1.3cm long. The leaf blades are shaped linear and have obtuse to acute apices. The leaf blades measure 1.2-7.8cm long and 0.1-0.3cm wide. There are 3-5 distinct nerves on the leaf; the 2 outermost nerves are submarginal.

 

The Inflorescence

 

The inflorescence is synanthous and free from the subtending leaf at the time of flowering. The peduncle is suberect to curved and measures 1.4-13.6cm long. The rachis is nodding to pendent and measures 1.2-4cm long. The flowers are arranged distichously, somewhat flexuose and spaced 2-3mm apart. There are 1-2 appressed non-floriferous bracts on the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

Between 5 and 17 flowers have been recorded as growing on an inflorescence. The flowers are pale brownish-pink to brownish-yellow. The dorsal sepal recurves gently and is shaped ovate to lanceolate with an acuminate apex. The dorsal sepal measures 2.4-4.8mm long and 1-1.4mm wide. The dorsal sepal has an entire margin and is one veined (rarely three veined). The lateral sepals are somewhat oblique, shaped ovate and have subacuminate apices. The lateral sepals measure 2.4-4.8mm long and 1-1.4mm wide. The lateral sepals have entire margins and are one veined (rarely three veined). The petals are oblique, shaped ovate to lanceolate and have acuminate apices. The petals measure 2.5-4.1mm long and 0.9-1.6mm wide. The petals have entire margins and are one veined. The labellum is porrect and 3-lobed. The labellum measures 0.6-0.9mm long and 1.7-2.4mm wide. The labellum is three veined and has entire margins. The side lobes are erect and outcurve at their apices. The side lobes are shaped oblong-flabellate and have rounded apices, the side lobes are noticeably larger than the mid-lobe. The mid-lobe is shaped subquadrate to transversely oblong and has a truncate apex that is apiculate in its centre. The lateral calli are shaped transversely oblongoid and located at the base of the side lobes. The median calli is much smaller and located between the 2 lateral calli in the centre of the hypochile. The column is somewhat incurved and hooded at its apex. The column measures 0.6-0.8mm long. The anther cap is broadly oblong from an upper view and truncate from the front.

 

Herbarium Specimens

 

Holotype

 

AMES

 

I could not locate this specimen

 

 

Other herbarium specimens

 

National Herbarium Netherlands (L)

 

Specimen L0322711

Specimen L0322712

Specimen L0322713

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected in the wild in January, May, June, July and during October. Plants in European cultivation flower during the winter.

 

Culture

 

This species is in cultivation in Europe and Australia although very rare. Non-flowering plants look very similar to Dendrochilum parvulum and some plants in cultivation labelled as such could be Dendrochilum pulogense.

 

Similar Species

 

Dendrochilum loheri

Dendrochilum parvulum

Dendrochilum microchilum

 

Other Information

 

At the time that Ames described this species two collections had been made on Mount Pulog at 2,500 metres. Ames noted that the foliage varied on one of the specimens to the point that it looked like a separate species mingled together. Ames wrote that he thought this species to have an affinity to Dendrochilum tenue (D. microchilum) and Dendrochilum parvulum

 

Henrik Pedersen wrote that this species is most likely a sister species of Dendrochilum loheri. Pedersen wrote that this pair is most closely related to Dendrochilum oliganthum and Dendrochilum ocellatum due to their small habit, few flowered rachis and apically hooded column.

 

Reference

 

AMES, Oakes. 1909, Notes on the Philippine Orchids with Descriptions of New Species, Philippine Journal of Science, Manilla, Philippines.

 

PEDERSEN, Henrik. 1997, The Genus Dendrochilum (Orchidaceae) in the Philippines – A Taxonomic Revision. Opera Botanica, Denmark

 

World Checklist of Selected Plant Families. 28 November 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 28 November 2008.