OF CEYLON AND INDIA. 
:^93 
mountain stream at Ramboda, October, 1853, Dr, W. H. 
Harvey.” He suggests that it may be an early stage of growth 
of H. olivaceum. No doubt can remain that it is simply the 
primary axis of the form just described, but to make 
quite sure I have myself examined the spot where it was 
found, and verified that the stream is inhabited only by 
Hydrobryum olivaceum. I have also examined the her- 
barium material at Peradeniya, Kew, and Paris, and in each 
case found the thallus attached to the base of the primary 
axis, leaving no possible doubt as to identity. 
With regard to the Anamalai form, it need only be 
remarked that it agrees in all essential respects with the 
description of the Ceylon form given above, but the lobing 
of the thallus is usually much deeper, more like that of the 
Nilgiri variety. 
The Nilgiri form, Podostemon griseus of Gardner, shows 
considerable differences from the Ceylon form. The pri- 
mary axis is larger and stouter, and sometimes bears flowers 
either on the hypocotyledonary portion, or among the leaves. 
Owing to the decayed condition of my material, I am 
uncertain whether these flowers are borne directly upon the 
axis, or, as in one or two cases seems to be the truth, upon 
very small thalli formed upon the axis. The question should 
be settled on living material in the latter part of the 
vegetative season. The tli alius itself has a curious gray 
colour in January, instead of the olive green of the Ceylon 
form, and at this period it is usually found to be more or 
less decayed and worn away, except just round the bases of 
the shoots. It is, as the specimens in PI. XXXIII. show, 
much more deeply lobed, as a rule, than the Ceylon form. 
Its primary axis was described by Tulasne as Dicræa apicata, 
whose identity I have verified as with Podostemon Gardneri. 
Hydrobryum «lohnsonii (Wight), Willis. 
As mentioned in the preceding paper, the autonomy of 
this species is very doubtful, I am inclined to think that 
it will ultimately prove to be the same as that already 
