Br ANNALS OF THE ROYAL BOTANIC GARDEN, CALCUTTA. [C. marginatus 
glossy, convex, not or very obsoletely grooved along the centre, the margins scarious, 
very finely denticulate-fringed, the point rather acute, Seed ovoid, 6 mm. long, 5 mm. 
broad, rounded at both ends, deeply and coarsely pitted; albumen subruminate, 
embryo basal, 
HasraT.—S. W. Borneo near Djihi, Z7. Winkler. No. 3824 in the Breslau Botanic 
Garden and Beccari Herbaria. 
OssERY^TIONs,— The peculiar hairiness of the lower surface of the leaflets has enabled 
me to recognize at once in Winkler's specimens from East Borneo, the Calamus which 
I had collected in Sarawak and identified with C. marginatus This Calamus was till 
now known from sterile specimens only and from the general appearance of the 
vegetative organs I had approximated it to C. Diepenhorstit. Now, that the fruit 
is known, I think that its affinities are more with the species included in group 
V aud especially with C. tenuis than with those of group X, as the albumen of 
the seed cannot be properly termed ruminate; in fact the integument of the seed 
of @. marginatus does not really interpenetrate the mass of the albumen as in 
C. Dispenhorsti, but is easily removable from the pits, however deep, of the surface 
of the seed. 
C. marginatus growing in S. E. Borneo differs from that of Sarawak in that its 
leaf-sheaths are shorter, and densely armed with spines; also the petiole is more 
spinous and the leaflets smaller. 
The specimens of C. marginatus from South Borneo really ought to be considered 
as the type plant, but of the latter only one leaf is known, so that a rigorous com- 
parison with either the plant of N. W. or with that of S. E. Borneo is 
impossible. 
In my description of the type @, marginatus (p. 326) I described the petiole 
as being narrowly channelled on the upper surface, as it appeared so in my  speci- 
mens, but it is actually concave on the upper and convex on the lower surface. My 
specimen had shrivelled in drying. 
Supp. PrarE 27 —Calamus marginatus Mart. Upper end of a plant with the 
bases of some leaves; a flagellum and the lower part of a spadix; the 
female spadix in flower; partial inflorescence loaded with fruits. From  Winkler's 
No. 3324. 
i consider as belonging to C. marginatus, a specimen received from Kew, which 
was collected by Hewitt on the Kiver Barram in N. W. Borneo in September 
1907. ‘his specimen consists of s portion of a leaf which agrees in the 
minutest details of the leaflets with that collected by me, and is moreover 
accompanied by a male spadix, which being hitherto unknown I shall now 
describe. 
The male spadiz is apparently ultra-decompound; the partial inflorescence seen 
by me is 70 cm. long and carries 6-7 gradually decreasing compound spikelets on 
