C. laevigatus. CERATOLOBUS. 13 
in 1893-94 on the Sungei Kenepai in Dutch Borneo (No. 2088 in Herb. Bogor.). 
The specimens upon which was established X. rigida Bl. were collected on the 
Duson. 
OBsERVATIONS.—It is a very near ally of C. Kengianus, which it greatly 
resembles in general habit and in the spadices; it differs however from this latter 
in the leaves having -more leaflets, of which the lowest pair are smaller than the 
intermediate ; it differs also in the spathe being covered more or less with tobacco- 
coloured scurf, and in the neuter flowers being very similar to the fertile ones. 
The young plant of C. rostratus collected by  Hallier (No. 2088) exactly 
corresponds to K. rostrata Bl, of which I have seen a portion of the type 
specimen preserved in the Leyden Herbarium. In this the leaflets have no ansa, 
and this alone is a character sufficient for retaining K. rostrata Bl. as a Ceratolobus. 
In Hallier's specimen from Amai Ambit, which evidently sas detached from a 
young plant, the sheathed stem is 6—7 mm. in diameter, the leaves have a very 
short petiole, are about 40 cm. long in the pinniferous part, and have 5—6 leaflets 
on each side of the rhachis; the leaflets are elongate, cuneately rhomboidal, 
conspicuously caudiculate-rostrate and whitish beneath; the intermediate and largest 
leaflets are 13—15 em. long, 4—5 cm. broad, the lowest being considerably smaller. _ 
One of Heyne’s specimens (19 bis) also taken from a young plant is very 
similar to that of Hallier; its sheathed stem is 8 mm. in diameter; the petioles 
are 5—7 cm. long and the leaflets as in Hallier’s specimen; but another specimen of 
the same collector (taken however from a more adult plant) has the sheathed — 
stem 15 mm. in diameter, the petioles are 12—15 em. long. and the leaflets 20—23 
em. in length; this specimen evidently forms a connecting link to the adult plant 
described above; the apex of the leaflets is very variable, at times being long 
beaked and at times almost blunt as in Heyne’s specimen No. 30 from Bandjermasin : 
this specimen is also remarkable for its slender stem, its sheaths being only 12 
mm. in diameter and encircled by very few laminar spines, whereas in the other 
also of Heyne (No. 19) mentioned above, the sheaths are 15 mm. in diameter, the 
laminar spines are numerous, often confluent by their bases, and the muricate ridges 
are few and much interrupted. 
The male flowers have been described from ‘a plant that has flowered recently 
at Buitenzorg (Herb. No. 309). 
PLate 7.—Ceratolobus rostratus Bece. Portion of a leaf-sheath with a spadix and 
one leaf, from Bandjermasin (No. 17 in Herb. Bogor.). | 
\ 
PLare 8.—Ceratolobus rostratus Becc. Terminal part of a young plant 
corresponding to Korthalsta rostrata Bl. from Sungei Kenepai (Hallier No. 2088 in 
Herb. Bogor.). 
6. CERATOLOBUS LAEVIGATUS, Becc. in Hook. f. Fl. Brit. Ind. vi, 477; Ridley, 
Mat. Fl. Mal Penins. n, 187; Heyne, Nuttige PI. Nederl. Ind. (1913), 
P x 2 ; 
Calamus laevigatus Mart. Hist. Nat. Palm in, 339; Walp.. Ann. iii, 489 
and v, 831; Mig. Fl. Jnd. Bat. ui 129. 
