STUDIES OF BRITISH FRESHWATER ALG^E. 
37 
Table showing relative abundance of the more important 
FILAMENTOUS AlG^ IN THE FiSH POND, AbBOT’s LeIGH, 1904 — 1908.1 
Jan. 
Feb. 
Mar. 
Aprii 
May 
June 
July 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
g 
ri904 
rr 
rr 
rc 
rc 
c 
C 
c 
0 
c 
rc 
c 
c 
b 
1905 
rc 
rc 
r 
rc 
c 
c 
VC 
vc 
vc 
vc 
vc 
vc 
1906 
c 
rc 
rc 
rc 
c 
0 
c 
VC 
c 
0 
vc 
0 
1907 
rc ? 
0 
rc 
0 
rc 
VC 
0 
vc 
0 
c 
rr 
0 
o 
^1908 
rr 
0 
rr 
r 
rr 
0 
0 
0 
rc 
0 
0 
0 
^904 
_ 
— 
— 
— 
vr 
rc 
r 
0 
c 
vc 
rc 
vr 
Si 
1905 
rc 
rc 
VC 
VC ! 
c ! 
VC ! 
r ! 
rc ! 
rc 
rc 
rc 
rr 
5 ^ 
1906 
rc 
vc 
VC 
VC ! 
VC ! 
0 
c ! 
— 
— 
0 
rr 
0 
1907 
rc 
0 
c 
0 
VC ! 
VC ! 
0 
vr 
0 
rc ! 
— 
0 
^1908 
vr 
0 
vr 
vr 
vr 
0 
0 
0 
— 
0 
0 
0 
g 
[1904 
rc 
rr 
rc 
r 
r 
rr 
r 
0 
rr 
rr 
rr 
rc 
s 
•<s> 
1905 
r 
rc 
rr 
r 
rr 
rr 
c 
c 
rc 
rc 
! vc ! 
rc 
s 
O V 
1906 
rr 
rc 
rc 
rc 
r 
0 
rr 
r 
rr 
0 
rc 
0 
1907 
vr 
0 
r 
0 
r 
rr 
0 
r 
0 
rr 
r 
0 
^1908 
rc 
0 
rr 
rr 
rr 
0 
0 
0 
vr 
0 
0 
0 
e 
^1904 
rr 
— 
r 
r 
. — 
vr 
— 
0 
— 
— 
rr 
rr 
■ ^ 
o 
1905 
r 
c 
rc 
r 
r 
rr 
r 
— 
rc 
rr 
rc 
rc 
1906 
c 
c 
rc 
rc 
rr 
0 
r 
rr 
vr 
0 
vr 
0 
1 
1907 
rc 
0 
r 
0 
vr 
c 
0 
— 
0 
— 
— 
0 
^1908 
-- 
0 
!■ 
vr 
r 
0 
0 
0 
— 
0 
0 
0 
o ^ -S" 
§ti- 
a904 
1905 
1906 
vr 
r 
rc 
rr 
rr 
rc 
vr 
rr 
rr 
r 
r 
vr 
rr 
r 
0 
r 
i 
vr 
0 
i 
r 
vr 
r 
vr 
0 
r 
r 
rc 
vr 
0 
g 
1907 
— 
0 
. — 
0 
— 
— 
0 
— 
0 
rc 
— 
0 
O 
1908 
rc 
0 
rc 
rc 
rr 
0 
0 
0 
— 
0 
0 
0 
In an 
ordinary 
year 
the ’ 
v^ernal 8pivogyva-p\\dJS>Q is 
such 
a 
featu 
re in 
the Fish pond that its complete absence in two out of the 
five years that we have had the pond under observation is very 
striking. Both in 1904 and 1908, however, the vernal Sjnrogyra- 
phase was completely absent, ^ and the dominance of the Diatom-vegeta- 
tion was gradually followed by dominance of the Cladophora. In the 
above-mentioned paper it was suggested that the absence of Spirogyra 
during the spring of 1904 was possibly due to the very excessive 
l^>c = very common; c=: common; rc = rather common; rather rare; 
7'=rare ; w' = very rare; ^ = isolated ; o = no sample; — = absent. An ex- 
clamation mark indicates reproduction. We feel some doubt as to whether 
the January sample of 1907 was quite representative. 
2 The vernal »S^M’o^?/r«-phrase was excellently developed again in the spring 
of this year (1909). 
