( )RCHII) ACEiB H ALCONENSES. 
319 
Pedicels of the lowermost flowers about 1 cm. long, very slender. Lateral 
sepals elliptic to suborbicular, relatively small, about 3 mm. long, very 
obtuse. Upper sepal oblong, obtuse, convex, 4.5-5, mm. long. Petals 
linear, about 4- mm. long. Labellum a.uriculate ; auricles (or lateral 
lobes) dolabriform, obtuse, 5.5 mm. long, about 3 mm. wide; middle lobe 
4 mm. wide, oblong; 6.5 mm. long, from the rounded tip to base of 
column ; monocallose at the base. 
Terrestrial in forests at 1,000 ft. alt. along the Binabay River, Dee. 4, 1906, 
Merrill (No. 5804). 
M icrostylis (§ Eumicrostylis) dentata Ames sp. nov. 
Leafy plants with elongated strict racemes of small flowers. Leaves 5 
or 6, lanceolate, very acute, about 10 cm. long, 2—3.5 cm. wide, bases 
imbricating, sheathing the stem. Peduncle elongated, 2-5 dm. long, 
often copiously bracteate. Bracts linear, deflexed, about 1 cm. long. 
Lateral sepals elliptic, very obtuse, 2 mm. long, about 1.5 mm. wide. 
Upper sepal similar to the laterals. Petals elliptic-oblong, very obtuse, 
about 2 mm. long. Labellum 3-lobed, auriculate ; auricles obtuse, 1 mm. 
long; middle-lobe oblong, bifid, 1 mm. long; on the anterior margin of 
each lateral lobe 3 acute teeth are situated; at the base of the labellum 
under the column is a minute callus. 
In forests at about 3,000 ft. alt. along the'Alag River, Nov., 1906, Merrill (No. 
5806) type. — In forests on Mount Halcon, Nov., 1906, Merrill (No. 5808). 
M icrostylis (§ Eumicrostylis) Hutchinsoniana Ames sp. nov. 
A species well characterized by the large, rotund, overlapping auricles 
of the 3-lobed labellum. Plants about 2 dm. tall. Leaves ovate, acumi- 
nate, 4-6 cm. long, about 2.5 cm. wide, petiolate. Petioles 2 cm. long. 
Peduncle graceful, exceeding the leaves. Bracts linear, acute, the lower- 
most, 6 mm. long. Flowers comparatively large, about 5 mm. across, 
pale purple, odorless (greenish when dry). Pedicels very slender, 5-7 
mm. long. Lateral sepals elliptical, very obtuse, 3 mm. long, margin 
very strongly revolute. Upper sepal 3.5 mm. long, somewhat narrower 
in relation to its length than the lateral sepals. Petals linear, obtuse, 
about 3 mm. long. Labellum 3-lobed, lobes subequal; middle lobe 
broadly oblong, rounded at the tip, very obtuse, 3.5 mm. long from tip 
to base of column, about as broad as long; lateral lobes rotund or sub- 
reniform, overlapping behind the column, 4 mm. long, 3 mm. wide. 
Terrestrial in forest at 2,300 ft. alt. on Mount Halcon, Nov. 9, 1906, Merrill 
(No. 5809). 
This species in named in honor of Mr. W. I. Hutchinson, who. was a member of 
the Mount Halcon Expedition. 
Microstylis (§ Commelinoides) Merrillii Ames sp. nov. 
Distantly related to M. conimelinifolia Zoll., from which it is to be 
distinguished by the very different, larger leaves and dissimilar flowers. 
Plants creeping, rooting at intervals. Roots long, slender, few. Rhizome 
