Accepted name: Dendrochilum graciliscapum (Ames) Pfitzer in H.G.A.Engler (ed.), Pflanzenr., IV, 50 II B 7: 99 (1907).

Subgenus – Platyclinis. Section – Eurybrachium.


 
 

Synonyms

 

Acoridium graciliscapum Ames, Proc. Biol. Soc. Wash. 19: 152 (1906).

Acoridium cucullatum Ames, Proc. Biol. Soc. Wash. 19: 153 (1906).

Dendrochilum cucullatum (Ames) Pfitzer in H.G.A.Engler (ed.), Pflanzenr., IV, 50 II B 7: 98 (1907).

 

Origin in the Wild

 

Mindanao

 

Elevation in the Wild

 

1646-2465 metres

 

Habitat in the Wild

 

E.B. Copeland found this species growing in large clumps on mossy trees on Mount Apo.

 

This species has also been found on Mount McKinley in Davao Province, Mount Kampalili in Davao del Norte, Lake Linao in Davao del Sur and Mount Matutum in South Cotabato.

 

The Plants Description

 

The pseudobulbs cluster on a short rhizome. The pseudobulbs are shaped fusiform. The pseudobulbs measure 1.2-3.5cm long and 0.2-0.5cm in diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls soon disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.7-4.0cm long. The leaf blades are shaped narrowly lanceolate and have rounded to obtuse apices. The leaf blades measure 5.0-16.0cm long and 0.4-0.9cm wide. The leaves are thin textured and have 1-3 distinct nerves.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect and measures 4.0-16cm long. The rachis is suberect to gently nodding and measures 2.0-6.5cm long. The flowers alternate distichously and are spaced 1.0-1.5mm apart; the rachis twists to form a cylindrical spiral. There are 1-3 appressed non-floriferous bracts at the base of the rachis. The flowers open from the distal section of the rachis.

 

The Flowers

 

The flower is brown to brownish-red, sometimes white and rarely yellow or green (Pedersen 1997). The sepals and petals spread widely, are somewhat reflexed and often contain a few scattered ocelli. The dorsal sepal is shaped oblong to lanceolate-oblong and has an obtuse to acute apex. The dorsal sepal measures 1.5-2.2mm long and 0.6-0.9mm wide. The dorsal sepal is one veined and has an entire margin. The lateral sepals are shaped oblique, elliptic-oblong to broadly lanceolate-oblong and have acute apices. The lateral sepals measure 1.5-2.3mm long and 0.7-1.0mm wide. The lateral sepals are one veined and have entire margins. The petals are shaped linear to oblong and have obtuse to acute apices. The petals measure 1.1-2.1mm long and 0.4-0.6mm wide. The petals are one veined and have entire margins. The labellum is porrect but somewhat recurved from the distal half and entire. The labellum is shaped oblong to subcordate or narrowly elliptic and has an obtuse to acuminate apex. The labellum measures 0.9-2.1mm long and 0.6-1.0mm wide. The labellum is three veined and has entire margins. The margin can be finely crenulate due to the large ocelli that are found around the margin. There are two keels located along the lateral veins and a proximal hooded callus at the base of the labellum. The column is suberect or straight and measures 0.5-1.1mm long. The apical hood is bilobed or four dentate. The stelidia grow upwards from the middle of the column and are equal to or exceed the column apex. The stelidia are shaped obliquely oblong to falcately linear and have rounded to acute apices.

 

Herbarium Specimens

 

Holotype

 

I could not find the specimen

 

Isotype

 

United States National Herbarium (US)

 

Specimen 00093506 (photo)

 

AMES

 

Specimen 32 (photo)

 

Other herbarium specimens

 

National Herbarium Netherlands, Leiden (L)

 

Specimen L0322505

Specimen L0322506

 

Royal Botanic Gardens, Kew (K)

 

Specimen 61478.000

 

AMES

 

Specimen 30 (photo) (isotype of Acoridium cucullatum)

 

Scent

 

There is no scent (Pedersen 1997)

 

Flowering Season

 

Flowering plants have been collected in the wild from March to May, July, and from September to December.

 

Culture

 

I do not think this species is in cultivation

 

Similar Species

 

Dendrochilum alatum (see this page for the differences)

Dendrochilum mearnsii

Dendrochilum copelandii

 

Other Information

 

Henrik Pedersen added Dendrochilum cucullatum as a synonym to Dendrochilum graciliscapum on account that this species shows variability. Dendrochilum cucullatum was similar but the labellum was different (Pedersen 1997).

 

Henrik Pedersen grouped this species together with Dendrochilum mearnsii and Dendrochilum copelandii based on the spirally twisted rachis, flowering starting from the distal section of the rachis, entire labellum and relatively wide stelidia.

 

Reference -

 

AMES, Oakes. 1908, Illustrations and studies of the Family Orchidaceae Facsimile 2, Ames Botanical Laboratory, North Easton, Massachusetts, Boston.

 

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

 

World Checklist of Selected Plant Families. 17 January 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 17 January 2009.