C. Semoi.] BECUAKI, THE SPECIES OF CALAMUS.—SUPPLEMENT, 129 
iguliform, later dry and falling to pieces, Leaves rather elongate, apparently about 
70 em. long in the pinniferous part and with very few leaflets; petiole short (3-4 
cm. long’, quite unarmed, concave on the upper and convex on the lower surface, 
the edges acute; rachis is slightly bi-convex in its lower portion, has a very obtuse 
smooth salient angle upwards on the upper surface, is very slightly armed on the 
back with a very few, very small claws, and terminates in a slender cirrus, which 
is regularly and not very closely armed with small, half-whorled claws. Leaflets 
very irregularly alternate, only 3-4 in number on each side of the rachis, and 
very distant one from the other (10-20 cm. apart’, papyraceous, rather firm, dull 
and smooth, on both surfaces, slightly paler underneath, lanceolate, or narrowly 
lanceolate-elliptical, gradually tapering towards an acute base and briefly acuminate to 
a bristly tip, plicate-pluricostulate or with 3-5 slender, but very sharp main-costae, 
which are accompanied by a few other nerves, smaller, but at times about as 
strong as the principal costae; transverse veinlets numerous, short, very fine, more 
prominent on fhe upper than on the lower surface; margins very remotely and 
inconspicuously spinulous ; the intermediate leaflets are 30-35 em, long, 3-4 cm. 
broad, the others are somewhat smaller. Other parts unknown, 
Hasrrat.—Dutch N. W. Borneo: Sungei Kenepai, Residency of Pontianak 
(Hallier, "No. 2198 in Buitenzorg Herbarium.) Native name “ Rotang Tapa.” It is 
probably one of the good commercial kinds of Rotang. 
OssERVATIONS.— C. Tapa is very imperfectly known, as I have seen only 
incomplete sterile specimens; nevertheless it is a very peculiar species, easily distin- 
guishable among the species of Group XV, by its leaf-sheaths of a soft texture 
and by the leaves with very few alternate elongate-lanceolate, pluricostulate leaflets. 
Apparently it is related to ©, caesius and O, trachycoleus, 
Teijsmann mentions (Verslag eener botanishe reis naar de West kust van 
Borneo, 1874-1875) a Calamus under the native name 
“ Rotan Tapa,” which 
probably corresponds to that described above. 
SuPPL. PLATE 74.—Calamus Tapa Becc. The type specimen  Halliers No. 2128 
in the Buitenzorg Herbarium. 
187C. Caramus SEMor Bece, n. sp. 
Descriprion.—Scandent, of moderate size. Sheathed stem about 25 cm. 
Naked canes 13 mm, in diameter, Leaf-sheaths strongly gibbous above, 
irregularly with solitary, elongate-triangular spines, which are 10-18 mm. long, 
have their bases 5-6 mm. broad and concave underneath, and leave stamped 
above them a shallow smooth impression of their form, while the entire surface 
interposed between these impressions is marked by very minute, approximate, 
sinuous, transverse very finely scabrid-serrulate, superficial ridges, 
with about 30 leaflets on each side; petiole very short 47-8 cm. long), flattish on 
the upper and slightly convex on the lower surface, armed more or less on both 
surfaces and on the margins, with short scattered prickles; the rachis has a line 
of small solitary claws along the eentre of the dorsum, 
salient angle and flat 
armed 
Leaves elongate 
and has a very acute 
side faces on the upper surface ; cirrus slender, armed 
Ann, Roy. Bor. Garp. Carcurra Vor. XI. 
