THE STUDY OF THE BRITISH FLORA 945 
a clear idea of how far the species and varieties of the one corre- 
spond with those of the other, owing to the diversities of the 
names employed. It would be a great boon to others as well as 
to be accepted, but that desirable consummation seems hardly yet 
in sight. Meantime, the most useful ee seems to be to eat in 
how ae there is agreement in fact anger the different nam 
Among the Cryptogams certain groups have fared eM than 
ite beans Panis as regards both their Liter treatment and their 
adequate illustration by modern methods and standards. 
Bare works of great value have dealt with the Mosses, the latest 
being Braithwaite’s British Moss-Flora, completed in 1899. The 
st. 
mong the "Thallophyta oe: groups have been more satis- 
factorily treated than others—e. g. the Discomycetes, the Uredinee 
and Ustilaginee, the Myxo ae otes, and certain others among the 
Fungi, and the Desmidiacee among the Alge ; but the tle 
as a whole are much in need of thorough revision to place 
on a footing ane Bina SRS or comparable to their saree 
in ye countri 
he Thallophyte, many more of the smaller species ae 
ne be discovered within our islands when close search i 
made, if we may judge by the much more numerous forms already 
many additional species will be discovered as native, or even 
among Pie some will pr bably be found. It is, ieieibate rather 
re) 
are timely to to be sbksing 
The labours of H. C. Watson gave a very great stimulus to the 
study of the distribution of the flora in England and Scotland, 
and the work he set on foot has been taken 
mere lists of name 
aes during a brief visit, but 
