58 
EXHIBITION AND LECTURE MEETINGS, 1951 
bor of spikelets per flowering head varied, but the variation was not 
related to the same environmental factors. The shape of the bract 
scale was almost constant. 
This variation may be either mainly genotypic, i.e. an ecocline, or 
mainly phenotypic, in which case Schoenus is a plant sensitive to its 
environment and a good indicator, by its growth, of environmental con- 
ditions. It will require transplant experiments to see which of these 
two h^qiotheses is correct. 
P. J. Newbohld. 
BBYOPTEFIS BOFBEBI Newm. 
= 1). Filix-mas var. paleaceo Moore. 
— D. Filix-mas var. Borreri Newm. 
This exhibit showed the main differences between Dri/opteris Filix- 
mas (L.) Schott, sens, strict, emend., and Drynpteris Borreri Newmn. 
An accompanying map showed the vice-comital distribution of D. Borreri 
Newm. in the British Isles, as far as is known at present. 
Any records for v.-cs. 15, 21, 26, 27 , 28, 29 , 43, 56, 74, 79, 81, 82, 84, 
91, 93, 102, 103, 107, 109, 112; HI, H3, H4, H5, H6, H8, HIO, HI 2, H13, 
H14, H15, H17, H18, H19, H21, H24, H25, H26, H29, H30, H31, H32, 
H34, H36, H37, will be most gratefully received. 
Miss J. P. Pugh. 
OYSTOPTFTUE mCKTFANA Sim. 
A living plant was exhibited. There is some doubt whether C. 
Bichieana is a form of C. fraqilis or a distinct species. It is named after 
Dr. Dickie, a Professor of Botany at Aberdeen, because he first distri- 
buted it. He states in his Flora of 1860 that it was known earlier as 
growing in a cave south of Aberdeen harbour. The fern has not been 
found as a wild plant in recent years in the British Isles. 
P. Greentteld. 
■ 2. Exhibits of Various Species 
Some new British ALCTTFMILTjA species 
Living and dried material of Alchemilla svhcrenata Bus., recently 
discovered in Teesdale, was shown. This is a common European species, 
for which, however, previous records in the British literature were false 
identifications. Also shown were sheet-s of an ‘acvHdens*-type Alchemilla 
from the Ben Lawers range, which is distinct from A. Wichurae ('Bus.') 
Stef. ; it seems doubtful whether this plant is identical with any de- 
scribed Scandinavian (or alpine) species. A sheet of A. ohtusa Bus. 
was also shown, collected in September 1951 at the only known British 
locality for this species. It was suggested that the similarity of this 
species to the common A. glabra Neyg. may well mean that it has been 
overlooked in other places. 
S. M. Walters. 
