»^94 WILLIS : MOLPHOLOGY OF THE PODOSTEMACEÆ 
described as H. lichenoides, Kurz, in which case of course 
the latter name must become a synonym. In view of this 
uncertainty there is no need to deal further with it here. 
Hydrobryum GriffHhii (Wall. MS.), Tul. 
(Plate XXXVI., figs. 6-8.) 
This species is the only representative of Tulasne’s sub- 
genus Euhydrobryum, subsequently raised to generic rank 
by Weddell, and characterized from its twelve-ribbed 
isolobous fruit and fan-like stigmas. 
Habitat — I found it growing on rocks on the bank of the 
Kalapani in the Khasia mountains, over which a slight 
trickle of water was running, but which from their extreme 
steepness would probably have a very rapid current in the 
rains, though perhaps not a very deep one. The habitat was 
almost exactly similar to those in which I have often found 
H. lichenoides and H. olivaceum. 
Dry Season Appearance . — This is very similar to that of 
H. olivaceum, but the thallus is in general smaller, the buds 
or shoots upon it are arranged in a more regular way, 
evidently radiating from a common centre, and the isolobous 
fruits are nearly prostrate, instead of being, as one might 
expect from their symmetry, erect. 
Mature Structure . — This is almost exactly like that of 
H. olivaceum in all important points. The thallus is similar 
in form to that of the Nilgiri variety of the latter, with deep 
sinuses between the lobes, and with the same curious 
growing margin. The secondary shoots are similar to those 
of H. olivaceum, and the flower emerges in the same way. 
The spathe shows a tendency to be bifid at the tip like that 
of Willisia, and the exposed part of it is very siliceous, as in 
that species, and seems sometimes to break off in a similar 
way. The structure of the flower shows little of special 
interest, exceptingin the stigmas, which exhibitmuch variety, 
parallelling that of H. lichenoides, and completely destroying 
the generic value of the stigmatic characters. In FI. XXXVI., 
