3 60 WILLIS : MORPHOLOGY OF THE PODOSTEMACEÆ 
form in the usual way, endogenously, behind the old one, or 
perhaps anywhere in the tissue, and soon grow out into new 
thalli. The older basal parts of the thalli can survive a long 
exposure, and may be found rejuvenescing at any time of 
temporary rise of the water in the dry season. 
D. sUjlosa Boiirdillonii, Willis. 
This form, which is the original type of the species, is 
common in herbaria. My spirit material was collected at 
Mundakayam in Travancore by Mr. Bourdillon. 
The dry season appearance is very similar to that of the 
last form, but the plant is larger in all respects, and much 
longer, while the non-floriferous parts of the thalli not un- 
commonly seem to persist, though they lose their leaves. 
The thallus is large, often to as much as 30 cm. long, broadly 
ribbon-like, and much branched, the width of the branches 
decreasing towards the outer ends. It is attached by a foot, 
and very often by one or more outer points. The lower 
part becomes floriferous as usual, with closely crowded 
shoots, just as in fucoides. The vascular bundles show large 
and brown where they lead to flowers, just as in D. Wallichii, 
and the marginal parts of the thalli break away more 
decidedly than in fucoides ; they often show thin and 
membranous in herbarium specimens. 
The flowers (PI. XXIV., fig. 2) are as in the preceding 
form, but larger, with longer stamens and with stigmas 
often as long as the ovary, but varying considerably in 
length. The stigmatic character is that on which Wight 
based the species, but is too inconstant tobe taken by itself. 
The fruit is borne on a long stalk with the usual deciduous 
cortex. 
D. stylosa algceformis^ Willis. 
This is Beddome’s D. algæformis (not Trimen’s), from 
the Anamalais, figured by him (3), but in some points 
