OF CEYLON AND INDIA. 
379 
Rejuvmescence."--^T]ii^ appears to be frequent in this 
species and to occur in the usual way, by formation of new 
thallus growing points. 
Hydrobryum ssssile;, Willis. 
'.Plate XXXII.) 
This species was discovered in S. Kanara by Mr. Barber, 
who kindly sent me a good supply of alcohol m.aterial. It is 
of interest as showing many transition features to characters 
which are well marked in other forms. 
Habitat . — This appears to be very similar to that of the 
preceding form — smooth rocks in rapid or shallow streams. 
Dry Season Appearance . — This is very like that of H. 
olivaceum, to be next described, but on closer examination 
it is easily seen that the rock is not covered, as at first sight 
appears to be the case, witha continuous coating of thallus, but 
that there are narrow slits dividing the branches of the thallus. 
The fruits are sessile among the dead bracts, and smooth. 
Mature Structure . — In general construction and growth 
the plant is like H. lichenoides. The thallus, however, is 
very much broader, and the branches are so close together 
that it practically covers the entire surface of the rock on 
which it grows (PI. XXXII. , fig. 7). It thus forms a transition 
in this feature to the true lichen-like thalli of the succeeding 
species. The secondary shoots and the development of the 
fioral buds are as usual. The flowers are sessile with long 
stamens and curved ovary (figs. 8, 9). The fruit is smooth 
and sessile, thus perhaps forming a transition to the fruit of 
Farmeria metzgerioides described below. Rejuvenescence 
probably takes place in the usual way. 
Hydrcsbryym oSivaceiim (Oardii.)^ Tyi. 
(Plates XXXII.-XXXVI.) 
As already mentioned, this very remarkable plant has been 
described under several different names, and I shall endea- 
vour to explain below the origin of this confusion. 
( 51 ) 
