Accepted name: Dendrochilum tenuifolium (Ames) Pfitzer in H.G.A.Engler (ed.), Pflanzenr., IV, 50 II B 7: 114 (1907)

Subgenus – Acoridium. Section – Convoluta.


 
 

Synonyms

 

Acoridium tenuifolium Ames, Proc. Biol. Soc. Wash. 19: 145 (1906).

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

1800-2150 metres

 

Habitat in the Wild

 

Ames wrote that this species is found in rainforest as an epiphyte (Ames 1908). Henrik Pedersen wrote that it is an epiphyte of mossy forest. This plant has been collected from Benguet Province on Mount Boadan, Mount Data, Mount Pulog, Mount Pulogloco, Mount Santo Thomas, Mount Simakoko, Mount Sinapsapan and Mount Tonglon. In Ifugao Province this species has been collected from Mount Himi-o, Mount Pimmage and Mount Polis. This species has been collected on the route from the miner's camp to Mount Burnay in Ilocos Norte Province.

 

The Plants Description

 

The pseudobulbs cluster along a short to elongate rhizome and are shaped fusiform. The pseudobulbs measure 0.9-4.0cm long and 0.1-0.3cm diameter. The pseudobulbs are covered by 3-4 cataphylls while they are growing. The cataphylls soon disintegrate into non-persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.4-1.5cm long. The leaf blades are shaped linear and have subacute to acuminate apices. The leaf blades measure 3.2-18cm long and 0.3-0.6cm wide.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is suberect to curved and measures 3.2-14.8cm long. The rachis is nodding to pendent and measures 2.3-7.4cm long. The flowers alternate distichously and are spaced 1-1.5mm apart. There are 1-2 appressed non-floriferous bracts at the base of the rachis. Flowers open from the proximal section of the rachis.

 

The Flowers

 

Ames described the flowers as white (Ames 1908), Henrik Pedersen added that they are rarely yellow (Pedersen 1997). The sepals and petals spread widely. The dorsal sepal is shaped lanceolate and has an acuminate apex. The dorsal sepal measures 2.4-3.6mm long and 0.8-1.2mm wide. The dorsal sepal is one veined and has an entire margin. The lateral sepals are somewhat oblique, shaped lanceolate to triangular-oblong and have acuminate apices. The lateral sepals measure 2.4-3.8mm long and 0.9-1.3mm wide. The lateral sepals are one veined (rarely two veined) and have entire margins. The petals are shaped lanceolate and have acuminate apices. The petals measure 2.2-3.1mm long and 0.7-1.1mm wide. The petals are one veined and have entire margins. The labellum is porrect and 3-lobed. The labellum measures 0.4-0.6mm long and 2.8-3.7mm wide. The labellum is obscurely 3-veined, glabrous and has entire margins. The side lobes are shaped linear-oblong and have rounded apices and are longer than the mid-lobe. The mid-lobe is shaped semiorbicular and has a rounded and finely apiculate apex. There are two calli located on the disc, the calli are located at the base of each side-lobe, and there is no median callus. The column is suberect to slightly incurved, it measures 0.7-0.8mm long. The column is slightly hooded at its apex. Stelidia and column foot are absent.

 

 

Herbarium Specimens

 

Holotype

 

Philippine National Herbarium (PNH)

 

Specimen - destroyed

 

 

Isotype

 

AMES

 

Specimen 60 (photo)

 

Royal Botanic Gardens, Kew (K)

 

I could not locate the specimen

 

US

 

BM - drawing

 

 

Other herbarium specimens

 

National Herbarium Netherlands (L)

 

Specimen L0322793

Specimen L0322794

Specimen L0322795

 

Scent

 

Yes

 

Flowering Season

 

Flowering plants have been collected in the wild from July to February.

 

Culture

 

This species is in cultivation although not easy to find in Europe.

 

Similar Species

 

Dendrochilum microchilum

Dendrochilum curranii

Dendrochilum turpe

 

Other Information

 

Oakes Ames wrote that this species is related to Dendrochilum microchilum (Acoridium tenue) and D. parvulum but differs by its oblong shaped side lobes that only have one vein. Ames also wrote that this species differs by its acute attenuated leaves. Henrik Pedersen agreed that there were superficial similarities but that because the leaves of D. tenuifolium are convolute it is placed in a different section from D. parvulum and D. microchilum.

 

Henrik Pedersen grouped this species with D. cinnabarinum, D. curranii and D. turpe.

 

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. 01 November 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 01 November 2008.