G; caesius. | BECCARI. THE SPECIES OF CALAMUS.—SUPPLEMENT 105 
Hasitat.—S, W. Borneo on the River Passir, between Simpokak and Semurong, 
H. Winkler No. 3012. 
Oxservations.—It is related to. C. mucronatus, from which it differs by it 
considerably larger size and by the ultra-decompound male ,spadix, or with partial 
inflorescences bearing compound spikelets, It is evidently the representative form 
of C. mucronatus in the east of the island. The mouths of the secondary spathes 
are uncommonly ciliate-bearded. 
SuPPL, Prate 58.—Calamus Winklerianus  Becc,—Leaf-sheath with the base of 
a leaf bearing an entire male spadix; an entire leaf; leaf-sheath and base of a 
loaf. From Winkler’s No. 3012, 
158. Catamus optimus Becc. 
The specimen figured in plate 188 of this volume may possibly represent the 
not yet full grown plant of (€. caesius, which has been collected with fruits in 
Sarawak and in other places in Borneo, and which is also known under the native 
pame of “Rotang Segah." In the original specimen of C. optimus however there 
is not any sign of the leaflets becoming geminate on each side of the rachis. 
159. Catamus carstus Bl. Add:—Ridley, Mat. Fl. Mal. Penins. ii, 206. 
To the localities add :—Sumatra: in the Residency of Palembang (J. A. van Rijn 
van Aikemade in Herb. Martelli). N. W. Borneo: in Sarawak at Quop (J. Hewitt in 
Kew Herbarium). On the Barito in central Borneo (Buitenzorg Herbarium), Cultivated 
at Samarinda on the River Coti or Kutei, collected by H. Winkler No. 3124, It 
is also cultivated in Sumatra and at Johor according to Ridley. It produces one 
of the best kinds of rattan canes, highly valued by traders. Vernacular name 
* Rotang Sega,” “ Rotan Segar," “ Rotaug Sega botol” or the true “ Rotang Sega.” 
Hewitts Sarawak specimen differs from those of the Malayan Peninsula 
only in the fruit being slightly larger (20 mm. long, including beak and 
perianth, 13-13:5 mm. broad), with slightly larger scales, arranged in 16-17 series. 
Winkler's specimens from Samarinda have fruits slightly longer (22 mm.) than those 
of the plant from the Malayan Peninsula but not broader. The seed is narrowly 
elliptical, 14 mm. long, 7 mm. broad, rounded at the base, subacute at the apex. 
The embryo is lateral, placed a little below the middle. All specimens have 
constantly the leaflets geminate on each side of the rachis; and conspieuously glaucous 
below. One of Winkler’s specimens, which exactly corresponds in the vegetative 
organs to the type figured in plate 189, has the male spadiz very long (2:5 m.), 
supradecompound, pendulous, very flaccid and terminating in a short, very 
slender, very finely clawed filament; it bears 9-10 pendulous, flaccid, partial 
inflorescences, of which the lower are about 1 m, long and bear 18-20 aiternate 
spikelet-bearing branchelets; the uppermost partial, inflorescences are much shorter (20- 
80 cm. long) and have proportionally fewer branchlets; primary spathes very elongate, 
tubular, closely sheathing, sprinkled with small prickles, obliquely truncate and 
‘ciliolate at the mouth, produced at one side into a triangular acuminate point ; 
the secondary spathes are 3-5 cm. long, are smooth or have a very few, very 
small prickles, are tubular and narrowly infundibuliform in their upper part, entire, 
Ann. Roy. Bor. Gann. Catcurra Vor. XI. 
