298 ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. [D. turbinatus 
terminates in a filament; they are firmly papyraceous, distinctly 3-costulate, on 
the upper surface the side costae are almost as strong as the mid-costa, all three are 
very minutely yet sparingly spinulous; on the lower surface the costae are not 
prominent and these, like the other nerves, are quite smooth; transverse veinlets 
extremely numerous and approximate, very sharply and equally defined on both 
surfaces; the margins are very minutely spinulous, the lower margin is bordered on 
the upper surface with a broad, polished, and glossy band; the largest leaflets are 
the medials of the lowest group; they average 40 cm. in length and 3 cm. in 
breadth. Male spadiz . . . . Female spadiz diffuse when in fruit, apparently 
not very large, it has several partial inflorescences distichally inserted, and kept 
horizontal by a conspicuous axillary callus; primary spathes not seen by me; the main 
axis is rigid, covered with a thin partially deciduous rusty-furfuraceous indumentum; 
the internodes are 5-7 cm. long, the lowermost subterete, 6-8 cm. in diameter 
the others very unevenly surfaced ; secondary spathes reduced to a narrow uniform 
ring; partial inflorescences 11-15 cm. long, their axis rigid, with short internodes 
and 4-5 spikelets on each side; tertiary spathes shortly annular, but produced 
at one side into a very short acute point; spikelets kept horizontal by a 
conspicuous axillary callus; the lower of each inflorescence is 7-8 cm. long, and has 
very few distant distichous flowers (4-5 on each side); the upper spikelets gradually 
shorter, and with fewer flowers; the axis of the spikelets is rusty-furfuraceous, 
sinuous, and acutely angular; the spathels have a very short annular limb, 
and are produced, at one side, into a broadly triangular acute point; involucro- 
phorum very distinctly pedicelliform, 5-7 mm. long, spreading, with a conspicuous 
axillary callus, acutely angular, subobpyramidate, broadening considerably towards its 
upper end, which is edged by a very narrow rim; involucre orbicular, flat, almost 
on a level with the involucrophorum, and edged by an extremely narrow rim; areola 
of the neuter flower inconspicuous, pit-like. Fruiting perianth obconical, pedicelli- 
form with a very hard base; the calyx is cyathiform with a flat hard base, 
rusty-furfuraceous, obsoletely veined, broadly 3-toothed; the corolla is more than 
twice as long as the calyx, the segments triangular, acuminate; from the perianth 
I estimate the female flowers about 6 mm. long. Fruit distinctly turbinate from 
a regularly round, or slightly depressed top, which is crowned by the remains of the 
sessile stigmas: it tapers to an acute base, is 2 cm. long on the average and 15 mm. 
broad; pericarp hard and not brittle; scales arranged in 15 longitudinal series, deeply 
grooved along the centre, of an uniform hazel-nut colour, rather glossy, conspi- 
cuously convex, with a re-entering obtuse point. Seed (immature). 
; Hasrtat.—N.-W, Dutch Borneo at Liang-gagang in the Residency of Sambas; 
discovered by H. Hallier, 1893-94 (No, 3042 in Herb. Hort. Bot. Bogor.). Native 
names “Rotan djelapang". No. 2595 of the same collector is represented by sterile 
specimens from young plants. 
OpsERVATIONS.—It is a very fine species, which the uncommon form of its fruit 
renders quite distinct. In all the other species of the group of D. mirabilis, of which 
tbe fruit is known, this is spherical; but several species of that group e know 
only from their vegetative organs, x 
