Accepted name: Dendrochilum mindanaense (Ames) L.O.Williams, Philipp. J. Sci. 80: 309 (1952)


Subgenus – Acoridium. Section – Acoridium.


 
 

Synonyms

 

Acoridium mindanaense Ames, Schedul. Orchid. 6: 25 (1923).

 

Origin in the Wild

 

Mindanao

 

Elevation in the Wild

 

I could find no record

 

Habitat in the Wild

 

This species has only been collected on Mount Urdaneta near Cabadaran in Agusan del Norte Province. I could find no information about the habitat.

 

The Plants Description

 

The pseudobulbs cluster along a short rhizome and are shaped slenderly fusiform. The pseudobulbs measure 0.8-2.9cm long and 0.1-0.3cm in diameter. The pseudobulbs are covered by 4-5 cataphylls while they are growing. The cataphylls disintegrate into persistent fibres as the pseudobulbs mature. The leaves are petiolate; the petiole measures 0.3-0.8cm long. The leaf blades are shaped narrowly-linear and have obtuse sometime finely mucronate apices. The leaf blades measure 2.8-10.1cm long and 0.1-0.2cm wide. There are 3 distinct nerves along the blades; the 2 lateral nerves are 0.5mm from the leaf margin.

 

The Inflorescence

 

The inflorescence is synanthous and free from the subtending leaf at the time of flowering. The peduncle is suberect to curved and measures 2.0-10.3cm long. The rachis is nodding to pendent and measures 2.3-7.0cm long. The flowers alternate distichously and are spaced c1.0mm apart. There are 1-2 appressed non-floriferous bracts at the base of the rachis. It is not known from where the flowers open from on the rachis.

 

The Flowers

 

The flowers open widely. The dorsal sepal is shaped oblong and has an acuminate-obtuse apex. The dorsal sepal measures 1.4mm long and c0.5mm wide. The dorsal sepal has an entire margin and is one veined. The lateral sepals are shaped elliptic and have acuminate apices. The lateral sepals measure 1.5-1.6mm long and 0.5-0.6mm wide. The laterals have entire margins and are one veined. The petals are shaped narrowly elliptic-oblong and are subacuminate at their apices. The petals measure 1.4-1.6mm long and 0.4-0.5mm wide. The petals have entire margins and are one veined. The labellum is porrect and 3-lobed. The labellum measures 0.4-0.5mm long and 1.1-1.2mm wide. The side lobes are erect, shaped obliquely oblong and have a rounded-obtuse apex. The side lobes equal or slightly exceed the mid-lobe. The mid lobe is shaped subquadrate and has a three dentate apex. The margins on the labellum are entire and there are no distinct nerves. There are two lateral calli located at the base of each side lobe. The lateral calli are situated close to the margin but not as close as on Dendrochilum binuangense. The median callus is located at the centre of the disc.  The column is suberect and straight and measures 0.5-0.6mm long. The column is somewhat hooded at its apex. The anther cap is suborbicular from its upper view and rounded from the front.

 

Herbarium Specimens

 

Holotype

 

AMES

 

Specimen 39 (photo)

 

Isotype

 

New York Botanical Garden (NY)

 

Specimen 39514 (photo)

 

AMES

 

Specimen 924 (photo)

 

BM

 

BO

 

Royal Botanic Gardens, (K)

 

I could not locate the specimen

 

National Herbarium Netherlands (L)

 

Specimen L0058679 (photo)

 

US

 

Scent

 

I could find no record

 

Flowering Season

 

Flowering plants have been collected in the wild during October.

 

Culture

 

I do not think this species is in cultivation.

 

Similar Species

 

Dendrochilum asperum

Dendrochilum parvulum var parvulum

Dendrochilum parvulum var strictiforme

Dendrochilum binuangense

Dendrochilum microchilum

Dendrochilum quadrilobum

Dendrochilum abortum

 

Other Information

 

Oakes Ames (1923) compared this species to Dendrochilum microchilum and wrote that it differed by its narrow leaves, smaller flowers and differently shaped petals and sepals. L.O Williams wrote that this species is closely related to Dendrochilum abortum. Henrik Pedersen agreed with Oakes Ames and placed Dendrochilum mindanaense in a group with those others named above. They are grouped because of the similarities of the labellum, vegetative similarities and a peduncle that is free from the subtending leaf at the time of flowering.

 

I have used Henrik Pedersen's measurements rather than Oakes Ames; the reason being is that more specimens have been collected since its original collection in 1923.

 

Reference -

 

AMES, Oakes. 1923, New and Noteworthy Orchids, Schedulae Orchidianae, No 6. Massachusetts, Boston.

 

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

 

World Checklist of Selected Plant Families. 16 December 2008. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/ accessed 16 December 2008.