250 WILLIS : PODOSTBMA(1H:Æ of indi a and ckylon. 
the Indian or other Podostemaceæ in their natural habitat 
will do so, as there alone can they be properly understood. 
So far as India is concerned, I would draw special attention 
to the many excellent localities in the Western Ghats ; the 
best of all, as regards richness in species, and interesting 
forms, is Beltangadi in South Kanara, but Khandala, 
between Bombay and Poona, Sullia in South Kanara, 
Paikara near Ootacamund, and Monica in the Anamalais, 
are all good. In Ceylon the best locality is Peradeniya itself. 
It is also evident that the South American Podostemaceæ 
will have to be revised and studied in detail before we can 
feel confident that many of the described species are not also 
duplicates, like so many of the Indian. Many have been 
thoroughly worked out by Prof. Warming, but the majority 
have still to be investigated, and all should be studied on 
the spot. 
Collectors also should be advised to pay more attention to 
these plants, to get material in all possible stages, both from 
above the water, from just below it, and from deep water, 
so as to illustrate as much as possible of the morphology 
and indicate what are the changes that go on when the 
plant is exposed to the air, an operation which, as has been 
indicated above and will be fully described in a later paper, 
often completely changes the appearance of the plant. 
Material still attached to the rocks should be taken and 
preserved both dry and in alcohol, and detailed notes as to 
all points with regard to each specimen, and as to growth, 
method of flowering, kind of situation, rate of flow of water, 
and other points, should be made before leaving the spot. 
The detailed observations on which many of the above 
descriptions rest will I hope be given in a subsequent paper, 
appearing in the next number of this journal. 
Peradeniya, March 30, 1902. 
Correction. 
On p. 192, lines 2 and 5, for “lig-nified ” read “woody”- there appears 
to be no actual deposit of lignin in Dicræa. 
