306 
G. Claridge Druce. 
THE INTERNATIONAL PHYTOGEOGRAPHICAL 
EXCURSION IN THE BRITISH ISLES. 
III. —The Floristic Results. 
The first International Phytogeographical Excursion through 
the British Isles in August last, which had been so admirably 
planned by Mr. A. G. Tansley, with the help of his colleagues of 
the British Vegetation Committee, who acted as genial and 
accomplished guides, and often dispensed a gracious hospitality, 
proved a great success, since the visitors included not only distin¬ 
guished ecological authorities like Professors Drude, Schroeter, 
Cowles and Clements, and expert botanical photographers like 
Professor Massart; but also such critical field botanists as 
Professor Lindman and Dr. Ostenfeld, and erudite botanical 
systematists like Professor Graebner. Therefore the writer, 
who had the privilege of accompanying the party throughout the 
extensive and wisely selected route through the British Islands, 
has to express his gratitude for the unique opportunity afforded of 
getting in touch with the views of his Continental confreres, and to 
offer his thanks to all the members of the party, and to the various 
leaders for their unvarying kindness. May he take this oppor¬ 
tunity of saying that he feels, as a floristic botanist, that in future 
he must not be content with merely looking at or studying the 
individual, but must also investigate its neighbours and environ¬ 
ment ? So also he ventures to suggest that phytogeographers must 
not be satisfied with knowing “ big ” species only, but also be 
able to discriminate the more critical forms, since these are often 
special adaptations, and may prove the key to more than one vexed 
problem. 
The following notes on some of the rarer, or more specially 
interesting plants observed on the journey may not, it is trusted, be 
considered out of place in these pages. It will be observed that 
through the acumen of Dr. Ostenfeld, a new waterlily and a 
Lady’s Mantle have been added to our flora, that Professor Massart 
pointed out a new “ variety ” of Sagina nodosa and that Dr. 
Graebner urged that f uncus ranarius has claims to specific rank. 
Professor Graebner also showed the members a variety Erikce of 
Calluna vulgaris, which Professor Ascherson had named after 
Professor Graebner's wife, Frau Erika Graebner, while Dr. 
