Accepted name: Dendrochilum cootesii H.A.Pedersen, Lindleyana 12: 205 (1997)

Subgenus – Pseudacoridium. Section – Luzonorchis.


 
 

Synonyms

 

Pseudacoridium cootesii (H.A.Pedersen) Szlach. & Marg., Polish Bot. J. 46: 114 (2001).

 

Origin in the Wild

 

Luzon

 

Elevation in the Wild

 

1200-2000 metres

 

Habitat in the Wild

 

This species has been found in Ifugao Province on Mount Himi-o and in Nueva Vizcaya Province from the Dalton Pass and Maliit.

 

This plant is found in submontane and montane forest. The plant grows close to the ground as an epiphyte. The plant favours very damp moss and areas that are well lit with plenty of air movement such as the edges of mossy forests.

 

The Plants Description

 

The pseudobulbs cluster along a short rhizome. The pseudobulbs are shaped terete-fusiform and measure 4.1-6.2cm long and 0.3-0.8cm in diameter. The pseudobulbs are dark green. The pseudobulbs are covered by 3-5 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 1.4-2.1cm long. The leaf blades are convolute, shaped lanceolate to oblong and have obtuse to subacute apices. The leaf blades measure 7.2-11.7cm long and 1.7-2.8cm wide. The leaves are leathery and have 7-9 distinct nerves; the median nerve is prominent on the abraxial side.

 

The Inflorescence

 

The inflorescence is synanthous. The peduncle is erect to somewhat curved and measures 7.8-13.2cm long. The rachis is quadrangular in transverse section, nodding to pendent and measures 4.7-8.5cm long. The flowers alternate distichously around a twisted rachis, the rachis appears cylindrical. The flowers are spaced 3-4mm apart. There are 2 non-floriferous bracts at the base of the rachis. The flowers open from the proximal section of the rachis.

 

The Flowers

 

The flowers are a cream to light green colour suffused with pink. The dorsal sepal is shaped narrowly elliptic-ovate to elliptic-lanceolate with an acute apex that is strongly recurved. The dorsal sepal measures 7.2-8.5mm long and 3.2-3.4mm wide. The dorsal sepal has an entire margin and is 3-veined. The lateral sepals are shaped falcately-lanceolate and have acute apices that are somewhat recurved. The lateral sepals measure 8.6-10.5mm long and 3.3-3.5mm wide. The lateral sepals have entire margins and are 3-veined. The petals are shaped obliquely-lanceolate and have acute to acuminate apices. The petals measure 7.0-8.3mm long and 2.1-2.4mm wide. The petals are 3 veined and have entire margins. The labellum is porrect, 3-lobed and obscurely 3-veined. The labellum measures 2.3-2.5mm long and 6.3-7.8mm wide at the side lobes. The side lobes embrace the column, are shaped falcately oblong and have obtuse apices. The side lobes are distinctly longer than the mid-lobe. The mid-lobe is small and is shaped like a triangular apiculum with two less distinct lobes. The mid-lobe margins are entire. There are two crescent shaped and slightly hooded calli at the base of each side lobe. There is a median keel that starts from the base of the hypochile and terminates half way along the mid-lobe apiculum. The column is straight and measures 2.5-3.0mm long. The column foot is absent. The apical hood is shaped prolonged into a truncate and dentate apex. There are no stelidia.

 

Herbarium Specimens

 

Holotype

 

NSW

 

Isotype

 

C

 

Other herbarium specimens

 

AAU

 

PNH

 

Scent

 

Yes, a scent like soap. I have read other peoples comments about there being no fragrance on their plants.

 

Flowering Season

 

In northern hemisphere cultivation I have observed this plant flowering from late winter to spring but have read that plants can flower in autumn. Flowering plants have been collected in the wild during November. The flowers generally last for 10 to 15 days.

 

Culture

 

This plant is relatively common in cultivation worldwide. I have seen plants in the USA, South Africa, Australia, New Zealand and the European Union. This species is often mislabelled as Dendrochilum anfractum see the note below.

 

Similar Species

 

There are no similar looking species

 

Other Information

 

Jim Cootes collected this plant in 1991 from the Luzon Province of Nueva Vizcaya at the Dalton Pass and Maliit. This plant featured in the Orchids Australia article as unidentified species ‘K’ (Cootes et al 1995). During 1994 Henrik Pedersen collected this species on Mount Himi-o in Ifugao Province, but due to the lack of flowers Pedersen was not able to describe the new plant. This plant found its was into cultivation during the early 1990s and was commonly mislabelled as a Pholidota. Jim Cootes wrote that this species has been mistakenly labelled as Dendrochilum pumilum var recurvum (Cootes et al 1995)

 

Dendrochilum cootesii is an isolated species in section Luzonorchis and mainly differs by its leathery leaves, spirally twisted rachis, ornamentation on the labellum, shape of the labellum, the apical wing that exceeds the anther cap.

 

There are many plants and photos labelled as Dendrochilum anfractum on the internet, nurseries, show tables etc. These photos and plants are all Dendrochilum cootesii. As far as I am aware there are no plants of Dendrochilum anfractum in cultivation and no photos of a living plant are in existence.

 

Reference

 

COOTES, Jim. The Orchids of the Philippines, 2001. Timber Press, USA

 

COOTES, Jim. BANKS, David. 1995, The genus Dendrochilum a guide to the species in cultivation, Orchids Australia, AOC

 

PEDERSEN, Henrik. 1997, Dendrochilum Cootesii, A New Protandrous Species from the Philippines, Lindleyana 12 (4): 205-207.

 

World Checklist of Selected Plant Families. 18 August 2009. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 18 August 2009.