35. It is convenient to record here the collecting work of the 
Horticultural Division to obtain living plants for cultivation in the Gardens. 
Besides the expeditions of early March and December recorded above, the 
Horticultural Division staff undertook two other major expeditions to 
Trengganu and Kelantan, and to Perlis, Penang, Perak and Pahang. Details 
of these are also recorded in Appendix VI. 
XXI. EXCHANGE AND ACQUISITION 
36. With the reconstructed herbarium in full use, the arrears of duplicate 
despatch were tackled, and a larger number of duplicates were distributed 
than in previous years. Against this a larger number of duplicates than usual 
was also received. The principal collections received were those of Dr. T. C. 
Whitmore lately of the Forest Department, Honiara, Solomon Islands, 
numbering 4,000 specimens. The Singapore Herbarium has a growing and 
important quantity of material from eastern Malesia, and the Solomons 
collections are a valuable addition. The Forest Department, Sarawak, has 
continued to be a major supplier with 1,669 specimens. Remarkably 
’‘confrontation’ notwithstanding, Bogor has also contributed valuably to the 
Herbarium with 966 numbers. Details of receipts and despatches are given 
in Appendix VII. The mounters prepared 8,754 specimens, and 5,782 were 
indexed and laid in the herbarium. 
XXII. LOANS OF HERBARIUM MATERIAL 
37. Activity in this section has also increased with the herbarium being 
in full use. Though additional material was sent out on loan early in 1964 
in view of the temporary close-down of facilities, requests for loans continued 
to come in and an increased quantity of material was sent out: 5,899 specimens 
to 13 institutions. The greatest part of this material went to Flora Malesiana 
monographers. 
38. A very large amount of material was received on loan for the study 
of staff members and for Colombo Plan Fellows studying here. The main part 
of the loans was Urticaceae for Dr. Chew and Verbenaceae for Mr. Munir 
Ahmad. 
XXIII. TAXONOMY 
39. Dr. Chew Wee-Lek, Keeper of the Herbarium, has continued his 
work on a world-wide revision of the Urticaceae, facilitated by the very 
generous response of other herbaria in the loan of their material for his study. 
Mr. Hardial Singh, Botanist completed a study of sclereids in the leaves of 
28 species of Araceae, and a similar study of sclereids in the leaves of the 
31 species of Malesian Fagraea has revealed interesting support for current 
taxonomic concepts based on morphology. Mr. Hardial Singh has commenced 
a taxonomic study of the aroid genus Anadendron. Dr. Chang Kiaw Lan, 
whose doctoral dissertation was on the taxonomy of the fungal genus Lentinus, 
.has continued her studies of this genus and closely allied ones since her 
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