Accepted name: Dendrochilum tetradactyliferum H.A.Pedersen, Nordic J. Bot. 15: 390 (1995 publ. 1996)

Subgenus – Platyclinis. Section – Eurybrachium.


 

 

 

Synonyms

 

None

 

Origin in the Wild

 

Mindanao

 

Elevation in the Wild

 

1916 metres

 

Habitat in the Wild

 

This species has only been found at Miran River, Baklayan on Mount Apo, Davao del Sur Province and has been collected as a trunk epiphyte along forested ridges.

 

The Plants Description

 

This is a small Dendrochilum. The pseudobulbs cluster on a short rhizome and are shaped slenderly fusiform. The pseudobulbs measure 1.0-3.5cm long and 0.2-0.4cm in diameter. The pseudobulbs are covered by c4 cataphylls while they are growing. The cataphylls disintegrate into fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.3-1.8cm long. The leaf blades are shaped linear-lanceolate and have obtuse to retuse apices. The leaf blades measure 3.6-10.1cm long and 0.5-1.1cm wide. The leaves are thin textured and have 3-5 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is more or less curved and measures 3-8.2cm long. The rachis is probably pendent and measures 2.9-5.0cm long.  The flowers alternate distichously and are spaced 1.0mm apart; the rachis twists to form a cylindrical spiral. There are 2-3 non floriferous bracts at the base of the rachis. The flowers open from the proximal part of the rachis.

 

The Flowers

 

The flowers open widely and are white or green (Pedersen (1997).  The sepals and petals spread widely. The dorsal sepal is shaped linear and has an acute sometimes mucronate apex. The dorsal sepal measures 4-5.9mm long and 0.7-1mm wide. The dorsal sepal is three veined and has an entire margin. The lateral sepals are linear and have obtuse apices, rarely mucronate. The lateral sepals measure 3.8-5.8mm long and 0.7-1mm wide. The lateral sepals are three veined and have entire margins. The petals are shaped linear and have acute apices. The petals measure 3.6-5.4mm long and 0.5-0.9mm wide. The petals are 1-3 veined and have erose to dentate margins. The labellum is firmly attached to the column, entire and porrect. The labellum is a shaped linear, is slightly widened at its proximal end and has an acute apex. The labellum measures 3.4-5.1mm long and 0.8-1.1mm wide. The labellum is glabrous; three veined and has an entire margin. The labellum has two small keels at its base. The column is suberect, straight and semi-terete. The column measures 0.9-1mm long. The apical hood is prolonged and distinctly exceeds the anther cap. The apical hood has two distinct prongs that look like stelidia. The stelidia grow upwards from the top of the column above the anther cap and distinctly exceed the column apex. The stelidia are shaped narrowly linear and have acute apices.

 

Herbarium Specimens

 

Holotype

 

AMES

 

Specimen 64976 (photo)

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected in the wild during November.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

NA

 

Additional Comments

 

Henrik Pedersen wrote (1995) “is distinguished by all other species of the genus by its subapical, linear stelidia which equal the length of the remaining part of the column. This species is probably most closely related to the poorly known D. prodigiosum which is likewise endemic to Mindanao”

 

Reference

 

PEDERSEN, Henrik. 1995, Thirteen new species of Dendrochilum (Orchidaceae), a new record from Burma, and a checklist of the genus in East Malesia. Nord. J. Bot 15:381-402. Copenhagen, Denmark.

 

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

 

World Checklist of Selected Plant Families. 07 September 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 07 September 2008.