WILLIS ; PODOSTEMACBÆ 
Ceylon, in the Dikoya and its tributary the Keheh 
ganga, H. F. Macmillan ! Willis ! 
The most distinct of all these varieties is Bhorense, with 
its long pedicels. Most of the north-eastern forms have the 
ribs confluent at, not below, the apex, and they and the 
Ceylon forms have much darker coloured fruits than the 
Western Indian forms ; but we have seen that the Lawias 
from the latter district had also lighter coloured fruit, and 
this may be merely an effect of the rock substratum. The 
Kanara and Anamalai forms have very long stamens, and 
probably together form a good variety, while other good 
varietal groups are probably the Assam forms taken 
together, and the Burma forms. Until, however, we have a 
much more detailed knowledge of all the forms, it will be 
unsafe to group them otherwise than tentatively. Each 
river or group of rivers appears to have its own form, whose 
range of variation, though it may at times overlap that of 
another form, does not coincide with it. 
Species Exckisa. 
ÏÎ. Wallichii, Endl. ™ Dicræa Wallichih 
FARME RI A, Willis, in Notes to Trimen’s Flora of Ceylon, 
vol. V., p. 386, 1900, revised. Podostemonis sp. {Mavœliœ 
spi)^ Trimen in FI. Ceyl., III., p. 419. 
Fruit dehiscent or not, with 8-10 ribs or none, with few 
large seeds. Thallus closely attached to rock, ribbon-like, 
regularly and endogenously branched. Secondary shoots 
as in Hydrobryum, but, behind the branches of thallus 
instead of in anterior axils. 
Flower on opening of spathe enclosed, more or less erect, sessile 
or (?) slightly stalked. Stamens 1 (? more). Pollen didymous. 
Ovary more or less globose, with thickened placenta towards the 
upper end, bearing two or four ovules on the under side ; lower 
loculus more or less abortive. Stigmas large, subulate. Fruit small, 
the upper lobe larger, in F. metzgerioides 2-seeded, sessile, indéhiscent : 
in F. indica 4~seeded, stalked, 8-10-ribbed, dehiscent. 
