336 WILLIS : MORPHOLOGY OF THE PODOSTEMACEÆ 
Ecology , — In general this is much the same as in Lawia. 
The plant is larger and less firmly fastened to the rock, and 
affects less rapid water. Its habit is less dwarf, and among 
the Indian Eupodostemeæ it is perhaps the one which 
approaches nearest to Tristicha in general habit of thallus 
and shoot, but it shows an advance on that genus in the 
greater dwarfing of the shoots, and makes up for great 
number of leaves by larger size of the few that occur ; it is 
thus able to live in shallow water with perhaps greater 
safety than Tristicha ramosissima. It still shows, what is 
rare in the succeeding genera, the assimilation chiefly per- 
formed by the leaves and not by the thallus. Vast quantities 
of starch are, as usual, accumulated in the thallus, the shoots, 
and the pedicel and placentae of the flower. 
Podostemon Barberi, Willis. 
(Plate XVIL) 
This very interesting new species, more closely allied to 
the preceding than to any other known species of the genus, 
but differing in its flat thallus and its single-staminate 
cleistogamic flower, as well as in a few other points, was 
discovered at Beltangadi in S. Kanara by my friend Mr. 
C. A. Barber, after whom I have named it. 
Habitat . — It occurs in a rapid, but not violent stream, and 
is mixed with Grifflthella Hookeriana, var. Willisiana. 
Dry Season A'ppearance . — The plant in the fruiting con- 
dition has some similarity to P. subulatus, but the fruits 
have much longer stalks, and the secondary shoots are very 
short. The flowers are easily seen to be cleistogamic, the 
spathes not opening until the fruits are nearly ripe and often 
hanging in wisps about the pedicels. 
Mature Structure . — The germination and early life-history 
of this plant have yet to be studied ; the only existing 
material is that collected by Mr. Barber at the end of the 
season. Probably, however, the general features of the life- 
history are much the same as in the preceding species. 
