Accepted name: Dendrochilum macgregorii Ames, Philipp. J. Sci., C 6: 42 (1911)

Subgenus – Acoridium. Section – Acoridium.


 
 

Synonyms

 

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

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

2900 metres

 

Habitat in the Wild

 

So far this species has only been collected on Mount Pulog in Benguet Province. The habitat was recorded as oak forest and the plant was found growing as an epiphyte.

 

The Plants Description

 

This Dendrochilum is very small and tufted, the pseudobulbs cluster along a short rhizome. The pseudobulbs are shaped obpyriform to ovoid and measure 0.5-1.1cm long and 0.3-0.6cm in diameter. The pseudobulbs are covered by cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate, the petiole measures 0.7-3.2cm long. The leaf blades are shaped narrowly linear and have acute apices. The leaf blades measure 5.3-10.8cm long and 0.2-0.3cm wide. The leaves are somewhat leathery and have 3 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous and free from the subtending leaf at the time of flowering. The peduncle is suberect and measures 2.3-8.5cm long. The rachis is probably pendent and measures 1.9-5.5cm long. The flowers alternate distichously and are spaced c1mm apart. There are 2-4 non floriferous bracts at the base of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The dorsal sepal is recurved, shaped oblong and has an acute to slightly carinate apex. The dorsal sepal measures 1.8-1.9mm long and 0.6-0.8mm wide. The dorsal sepal has an entire margin and is obscurely three veined. The lateral sepals are shaped slightly oblique, elliptic-ovate and have obtuse somewhat carinate and mucronate apices. The lateral sepals measure 1.8-2mm long and 1-1.1mm wide. The lateral sepals have entire margins and are obscurely three veined. The petals are recurved, shaped obliquely obovate and have rounded apices. The petals measure 1.7-1.8mm long and 1-1.1mm wide. The petals have entire margins and are obscurely three veined. The labellum is porrect and entire. The labellum is shaped quadrate-orbicular and has a subacuminate apex; the labellum is sagittate at the base of the hypochile. The labellum measures c1mm long and 1mm wide. The labellum has entire margins and is obscurely 3-veined. The callus is shaped like a crescent. The column is suberect and straight and measures 0.5-0.7mm long. The column has a slight hood at its apex. The anther cap is transversely elliptic from the upper view and rounded from the front.

 

Herbarium Specimens

 

Holotype

 

AMES


Specimen 18826 (photo)

 

Isotype

 

Royal Botanic Gardens, Kew (K)

 

I could not locate the specimen

 

US

 

Bogor (BO)

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected in the wild during July

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum marginatum

Dendrochilum philippinense

Dendrochilum rhombophorum

Dendrochilum foxworthyi

 

Other Information

 

Henrik Pedersen placed this species in the same group as those outlined above. This species is more closely related to Dendrochilum philippinense and Dendrochilum rhombophorum because of the horseshoe shaped callus on the labellum.

 

Reference

 

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

 

World Checklist of Selected Plant Families. 19 November 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 19 November 2008.