157 
to which I beg to refer. Now when comparing our harvest. of 
Sebesy with that of Krakatau the fact should be taken into 
account that much more time was spent in collecting at Kra- 
katau and Verlaten Kiland. The flora of these latter islands 
being moreover as we shall see more uniform it is less difficult 
to get a general survey of the vegetation there than at Sebesy. 
At Krakatau I made collections during three separate excursions, 
I was five times on Verlaten Eiland and I have been three times 
to the top of Mount Rakata. In my earlier articie on the Kra- 
Katau flora which should be regarded as merely a provisional 
sketch of that flora, the harvest of my first excursion in Apvril 
1919 has been discussed. Since then a great many new plants 
especially fungi, mosses liverworts, and lichens have been noticed. 
The latter are being elaborated; unfortunately I have so far 
been unable to find an expert to elaborate the hepaticae and 
therefore it seems to me advisable, apart from a few general 
remarks, to confine myself to the vascular plants. 
At the end will be found two lists of plants. Appendix I © 
contains the plants found by me on Sebesy with mention of the 
kind of finding-place and the register number under which they 
have been collected so that they can always be consulted at 
the Buitenzorg Herbarium. The material has been named at 
Buitenzorg also, the Pteridophytes by Capt. van ALDERWERELT 
van Rosensuren, the Phanerogams mostly by Dr Suita, a smaller 
number by Messrs Backer, Baxauizen vAN vEN Brink, Lam and 
VAN Stooren, to all of whom I have much pleasure in acknow- 
ledging thanks. As far as possible are used the newest names 
in the list, though this led to many names being now different 
from those in my table of the Krakatau plants. To prevent 
misunderstanding the names used in the earlier list have been 
printed along with the new name (within brackets). To the 
botanist who is not continuously engaged in systematics the 
ever recurrent alterations of names are a great trouble and it 
will be a boon to all concerned when at last a definite nomen- 
clature will have been reached. Not till then will the auxiliary 
science of plant-description contribute adequately to the spread of 
a correct insight into general botanical questions as it ought to do. 
