NOTES ON DIPTEROCARPS. 279 
dried flowers offer no character by which the two can be distin- 
guished, it is well not to state dogmatically yet that P. umbonatus 
and P. Stapfianus are distinct species. 
Pachynocarpus verrucosus, (Burck) Heim, described upon a 
specimen from Sungei Landak in Borneo, north east of Pontianak, 
collected by Teysmann, will probably be united with one of the 
other species when fully studied. 
Pachynocarpus Stapfianus is like Vatica Ridleyana a tree of 
rising land. The result is that flowering herbarium specimens un- 
authenticated by fruits, if from the interior of the Peninsula, are 
more likely to be it than the similar Vatica Wallichu. We know 
it to occur in the Siamese Malay States, Penang, Perak, Selangor, 
-and Pahang. King’s Collector records it as S0-100' ft. high, with 
a cirth up to 3 ft. As it occurs at Bangi, Selangor, it is a tree 
38 ft. 2 in, Mie and) Ser. ie iam omen ay breash metelnibs.. Aine 
height to the first branch is 6 ft. 4 in., and the girth just below the 
first branch 2.{t.11in. The spread of the crown is 26 ft. 4 in. 
We have not measurements of any other trees. Its leaves in 
most ca:es dry dark as in some specimens of Vatica Wallichu, so 
that by their colour there is no means of separating the two when 
‘dry. Of the flower in life we are not able to give a figure. We 
have records of flowering in July and October in different places 
and different years: and of fruiting in January, February, April 
and July. 
The fruit when half ripe is acute to blunt; and when fully 
ripe by the rounding of the fertile loculus becomes globose and 
generally loses the minute apiculus representing the style. It has 
not the dimensions ascribed to it by Sir George Kine in any of 
the type specimens but is about one inch long. The calyx is ad- 
herent through 4-2 of the length of the fruit. It and the exposed 
surface of the earpellary wall above it are lenticellate, sometimes 
little, sometimes much. The tip of the sepals persists and is free 
until the fruit is half ripe, then it generally falls off. The months 
when fruit is most likely to be found are March, April and May. 
The embryo is quite unlike that of Vatica Wallichu. The 
outer cotyledon is half-wrepped half-folded round the placentar 
cotyledon ; and both reach the apex of the fruit cavity: 
Figs. 9 and 10, the embryo of Pachynocarpus stapfianus 4 nat. size. 
Our material of Pachynocarpus Stapfianus is 
Lower Sram. Taph Klong Wan towards the Tenasserim eice 
IG a alergUL TH aL March. 1919, Hamid 3781 
R®. A. Soc., No. 86 1922. 
