NOTES ON PHILIPPINE ORCHIDS, IV. 
27 
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 
glumaceae, ovario longiores. Sepala lateralia ovato-Ianceolata, 
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. Vanoverbergh, November-De- 
cember, 1910. 
Dendrochilum Vanoverberghii appears to be a near relative of D. exile' 
but differs from it in the details of the flower, and in general 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: 86 fig. 
