EXHIBITION MEETING, 1952 
.'il 
EXHIBITION MEETING, 1952 
An Exhibition Meeting was held in the Lecture Hall of the British 
Museum (Natural Histoi-y), South Kensington, by kind permission of 
the Trustees, on Saturda 3 ', Novenilier 29th, 1952, from 2.30 to 5.45 p.m. 
Tlie attendance created a new record, comprising 230 members and 
guests. Exhibits wen- arrang('d by 50 individuals and institutions and 
an account of these is given below. A feature of the exhibition was the 
more intensive study of the smaller critical groups, particularly by some 
of the younger members of the Society. 
The followijig is a list of the exhibits with n ites supplied by the 
exhibitoi*s. 
Distribution Patterns of Manx Plants 
A series of maps was exhibited showing different, contrasting pat- 
terns revealed in plotting the distribution of various species in the 
Isle of Man. Comparison with the rainfall map explained some of these 
patterns, but not others. 
D. E. Allen. 
CABDAMINE llAYNEANA in Britain 
A sheet of G. hayneana (Reichb.) .liingst, a (lentral European species, 
was exhibited from the Druce Herbarium, Oxford. It was collected in 
Hereford, shire in 1929 by R. F. Towndrow and constitutes the first 
certain record for Britain. Two sheets, from Hertfordshire and Sussex 
respectively, of plants very close to this species, but with evident hybrid 
influence, were also exhibited. Previous records of G. hayneana. in 
Britain have been based on misidentifications of G. fragilis (Lloyd) Bor., 
or the sterile hybrid between G. pratensis L. and G. flexuosa With. 
D. E. Allen. 
The Distinguishing Characters of GAKILE EDENTULA 
Herbarium material of G. ederitula (Bigel.) Hook., a species recently 
detected in Scotland, was exhibited, together with drawings of the fruit 
and leaves, to illustrate the differences from the more widespread G. 
muritima Scop. 
D. E. Allen. 
British Charophyta 
Slides (fluid mounts without pressure) of fruiting whorls of various 
species, with low-power binocular microscope. 
G. O. Allen. 
An ASELENIUM Hybrid 
A. H. G. Alston. 
