he reported (A//len 306/): “Latex pale yellow, seldom flowing 
freely, usually coagulating in the cuts ina manner reminiscent of 
Castilla. This scrap can be removed after an interval of about 
three days, usually being wound into balls. Tensile strength 
excellent, considerably better than weak fine Hevea. Some resin 
content.” On a separate label (A//en 3067), Allen noted: “Coagu- 
lated latex has much higher tensile strength than the best Acre 
Hevea. Yield very variable, but averages less than a quarter 
pound from felled trees. Cannot be tapped daily as Hevea.” He 
similarly states of M. siphonioides: “Latex pale yellow, seldom 
flowing freely, usually coagulating in the cuts in the manner 
reminiscent of some species of Castilloa [sic], being removed 
after an interval of about three days as scrap, which is wound 
into balls. Tensile strength excellent, being considerably better 
than Acre Fine Hevea.” 
Allen offered notes also on the latex of other species of 
Micrandra. Of M. Spruceana, he wrote: “Bark very thin... with 
scanty latex which coagulates with difficulty, producing a non- 
elastic gum.” Micrandra Sprucei, he annotated, had: “Latex yel- 
lowish, scant, coagulating to a non-elastic gum.” For M. 
Rossiana, he reported: “Latex very scanty, coagulating to a 
gummy non-elastic mass.” Although Allen’s notes suggest the 
possible exploitation along the Rio Papuri of M. minor and M. 
siphonioides, there is every indication that the other three spe- 
cies which he collected could not be worked and gave too little 
rubber or rubber of no commercial value. 
The latex of all species of Micrandra is white, or cream- 
coloured, except for some individuals of M. Rossiana, where it 
may often be yellowish. Ule’s statement (Ule, E. in Tropenflanz. 
Beih. 6 (1905) 1) that Micrandra milk may be distinguished from 
that of Hevea by its orange colour must be an error, for of the 
thousands of trees which I examined only a few had even a 
slightly yellowish latex. It is usually thick and slow-flowing. In 
taste, it is somewhat sweet, quite unlike the burning and bitter 
taste of most Hevea latex. It coagulates slowly on the trees, 
remaining tacky and resinous for weeks. The addition of river- 
water causes Micrandra latex to coagulate; whether or not this is 
due to some mineral or organic constituent present in this 
impure water is not known. Most rubber tappers whom I ques- 
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