273 
TEN YEARS’ PROGRESS IN LICHENOLOGY 
IN THE BRITISH ISLES. 
(Being a Presidential Address delivered to the Club at the Annual 
Meeting on 2 nd April, 1921. 
By ROBERT PAULSON, F.L.S., F.R.M.S. 
(With Four Plates.) 
D URING the past year the Club was able to avail itself 
of a favourable opportunity for acquiring, by purchase, 
some 590 specimens that formed part of the lichen-herbar¬ 
ium of the late Rev. W. Johnson, a well-known collector and keen 
observer of cryptogamic plants. As a result of this purchase 
it now possesses nine fasciculi of Larbalestier’s Lichen-Herbarium, 
two fasciculi of his Lichenes Rarissimi, and 150 British lichens 
collected by the Rev. W. A. Leighton, who did much pioneer work, 
culminating in the publication of a Lichen Flora of Great Britain, 
which became, and still is, indispensable to all students of British 
lichens. Larbalestier, a most enthusiastic lichenologist, spent 
much time in collecting lichens in the Channel Islands and in 
West Ireland ; the accuracy of his keen discriminating power 
is evident by reason of the number of lichens he was able to add 
to the British flora. 
So recently as February last the Club received a valuable 
grant of duplicate lichen-specimens from the Trustees of the 
British Museum, through the kind offices of Dr. A. Barton Rendle, 
Keeper of the Department of Botany. This gift is of the greatest 
value to the Club, for the specimens form a set of the lichens 
of Epping Forest collected and named by the late Rev. J. M. 
Crombie, who* until his death, was intimately connected with 
the Club as an honorary member. 
The acquisition of the above has augmented the number of 
lichen-specimens in the Club’s herbarium by 1,192, the total 
number of which is now 1,500, including a few duplicates. This 
large addition to the herbarium deserves more than a passing 
note, and for this reason I have made it the occasion for placing 
before the Club a short resume of the progress of lichenology 
during the decade 1911-1920. 
It is not possible within the space of an hour to give more 
than a brief outline of the salient points, although, owing to 
T 
