NOTES ON PHILIPPINE ORCHIDS, IV. 
17 
lamina; orbicular base about 5 mm long, 6 to 7 mm wide, with 
a membranaceous, sulcate lamina on each side of the middle 
nerve which extends beyond the lateral lobes, the linear papil- 
lose portion about 1 cm long, lamina about 4 mm long, 1.5 mm 
wide. Foot of the column 4 mm long. 
Mindanao, Lake Lanao, Camp Keithley, Mary Strong Clemens 508, 
April, 1906: Negros, W. S. Lyon UO, December, 1907, “epiphyte, pedicel 
green, base of perianth pure white, prolongations of sepals and petals 
lemon-yellow.” 
This species, which is closely allied to Dendrobium filiforme J. J. Smith, 
belongs to the section which, in his recent monograph. Doctor Kranzlin has 
established as the genus Diplocaulobium, characterized by a uniarticulate 
stem, 3-lobed crested labellum, and ephemeral flowers. Dendrobium longi- 
colle Lindl., another species of this section, has been reported from the 
Philippines, but without sufficient authority. 
Dendrobium iunatum Lindl. in Journ. Linn. Soc. Bot. 3 (1859) 4. 
In my preceding paper,' I referred Dendrobiu^n Iunatum Lindl. to the 
synonymy of D. indivisum Miquel. Further studies have convinced me that 
this proceeding was a matter of mistaken judgment. From the material 
referred by me to D. indivisum, D. Iunatum differs slightly in foliage and 
also slightly in the labellum. The leaves are not so spreading as in D. 
indivisum, their tips pointing more exactly in the same direction as the 
stem. The labellum of D. Iunatum is not 3-lobed, although in my specimens 
it is hardly so reniform or lunate as shown in the sketch preserved with 
the Cuming specimen from the Philippines in Lindley’s Herbarium. The 
flowers of both species are whitish or yellowish with purple streaks. 
According to Kranzlin’s recent monograph Dendrobium indivisum Miquel 
(not Bl.) and D. distichum (Presl) Reichb. f., are conspecific. The 
specimens previously referred by me to D. indivisum Miquel belong to D. 
distichum (Presl) Reichb. f. 
The specimens of D. Iunatum which I have examined come from Palawan, 
F. W. Foxworthy, Bur. Sci. 907, May 6, 1906. 
Dendrobium MacGregorii sp. nov. (§ Aporum, Hemiphylla) . 
Caulis ad basim teres, foliosus, compressus, anceps. Folia 
disticha, lanceolata, a latere visa lanceolata. Sepala lateralia 
triangulari-lanceolata, subacuta. Sepalum superius oblongi- 
ovatum, obtusum. Petala lineari-oblonga, obtusa. Labellum 
cuneato-spathulatum, ad apicem trilobatum, lohi rotundati, ob- 
tusi, laterales obscuri, medius obtusus. Mentum obtusum. 
Plants (somewhat resembling D. teloense J. J. Smith, but 
with very diiferent leaves) leafy to about the middle, slender 
and nearly terete at the base, about 5 dm tall. Leaves about 
3.5 cm long from the tip to point of insertion, 1.5 to 2 cm long 
from tip to angle formed by the inner edge of the leaf and 
“ This Journal 6 (1911) Bot. 52. 
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