pep OS RRR OER IE ES I TT I PRET ee a PONT GE RN AOI EE METI MD RE LOT RRS pS EN TEGAN LE INE SEAL: PS me a a a ET rE Hal 
iad Set See ee ‘, mee Pie ee eT ae 
I i ed 
49 
THE ALGA-FLORA OF CAMBRIDGESHIRE. 
Br Ge s8.. Wer, BA: Af.0.5., 
Scholar of St. John’s College, Cambridge. 
(PiarEs 894-396.) 
Very little is known concerning the Aes Alge of the 
eastern counties of England, only a few scattered records for 
Norfolk and Essex* and two lists of Herthisdahicn Diatomst having 
been published. As yet no work has been done at the alge of 
Cambridgeshire, and the present paper is one which will serve as a 
basis upon which the alga-flora of the county can be gradually 
accumulated. It is the result of an examination of a large quantity 
of material collected systematically from various parts of the county 
varying conditions. The greater part of the collections were made 
by myself, but I am also indebted to my brother, W. West, Jun., 
B.A., for some gatherings from several places in the county. The 
eB the light ~ much previous experience, that I have been enabled 
obta of the species included in the following account 
Most orders of the Chlorophycew (or green alge) are represented to 
are moderately ane R those forms bearing ar tet te being 
are particularly unsuitable for the existence of an extensive and 
varied collection of alge, although it is highly probable that many 
good things existed on Gamlingay Heath (situated on the Lower 
Greensand) prior to the time it was drained. The topography of 
the county is not sufficiently diversified, and, owing to the general 
low level, none of the peculiar Benen in gatherings are forthcoming, 
few ign being found, and, comparatively, still fewer Des- 
The scarcity of the fatter is remarkable, only ten out of 
picky: -four British genera being represented, and these but scantily. 
he two most fruitful localities for Desmids are undoubt tedly 
the fens at Wicken and Chippenham, each being a small remnant 
eed Cooke, British Desmids, and also in ees: at -various times; 
W. West & G. 8. West, ‘ Contri Pe Fre shw. Alg. S. of England,’ Journ. Roy. 
Micr. Soc. 1897, 467-511, ll. vi. 
+ I. Robinson, Trans. tabi Nat. Hist. Soe. iii. 1-9 (1884) ; iv. 196- 
200 (1887) 
Journat or Botany.—Vou. 37. [Fus. 1899.] zz 
vio. Bot. Garden, 
1900. 
