NOTES ON PHILIPPINE ORCHIDS, IV. £7 
/ 
In my second volume of "Orchidaceae," having no material and judging 
wholly from the original description, I referred to Platyclinis microchila 
as a near affinity of Dendrochilum tenue Pfitzer. In a letter dated Novem- 
ber 7, 1910, Doctor Schlechter states that Dendrochilum microchilum and 
D. venustulum Pfitzer are identical. 
* 
Dendrochilum (§ Acoridium) Vanoverberghii sp. nov. 
Pseudobulbi pyriformes in sicco rugosi. Folia linearia, acuta. 
Pedunculus folio longior. Inflorescentia laxiflora. Bracteae 
g-lumaceae, ovario longiores. Sepala lateralia ovato-lanceolata, 
acuta. Sepalum superius oblongi-lanceolatum, acutum. Petala 
lanceolata, acuta. Labellum crassum, 3-lobatum, lobi laterales 
obtusi, lobus medius apiculatus. 
Whole plant, including the peduncle, up to 24.5 cm high, as 
shown by the type. Pseudobulbs elongated pyriform, 1.5 cm 
long, about 5 mm in diameter at the base, rugose in dried speci- 
mens, clothed with the fibrous remains of sheathing bracts. 
Leaves linear, acute, 4.5 to' 7.5 cm long, about 2.5 mm wide, 
grass-like when dry. Peduncle free, from the summit of the 
pseudobulb, slender, graceful, about twice longer than the leaf, 
about 1 dm high, not exceeding 13.5 cm in the type. Inflorescence 
loosely flowered, subtended by two imbricating, scarious bracts ; 
flowers about 3 mm apart, distichously arranged. Pedicel and 
ovary 2 mm long, concealed by a glumaceous bract. When 
fresh the flowers are white with a "red" lip, in dried specimens 
they are brownish. Lateral sepals ovate-lanceolate, acute, 3- 
nerved, 2.5 mm long, 2 mm wide near the base. Upper sepal 
oblong-lanceolate, acute, 2.5 mm long, 1 mm wide, middle nerve 
conspicuous (in dried specimens). Petals lanceolate, acute, 3- 
nerved, 2 mm long, 1 mm wide. Labellum fleshy, 1.5 mm long, 
somewhat saccate near the base, 3-lobed \ lobes subequal, laterals 
rounded, obtuse in front; middle lobe longer than the laterals, 
subquadrate, apiculate, broader than long. Column minute, 
characteristic of the Section Acoridium. 
Luzon, Bontoc Subprovince, Father M, Vanoverbergk, November-De- 
cember, 1910. 
Dendrochilum Vanoverberghii appears to be a near relative of D, exiU* 
but differs from it in the details of the flower, and in genera) habit, the 
leaves and peduncle of D, exile being about subequal, while in D. Vanover- 
berghii the peduncle exceeds the leaf to a conspicuous extent D, Mac- 
Gregorii is also a near relative but the lip-characters of that species and the 
dense inflorescence are conspicuous differentiating peculiarities. 
■ Orchidaceae 2: 85 fig. 
