43*5 Table to show Occurrence and Reproduction of 
Species of Spirogyra. 
Spirogyra 
affinis (Hass.), Petit 
bellis (Hass.), Cleve 
cataeniformis(JA.a.ss.'), Kiitz. 
condensata (Vauch.), Kiitz. 
Hassallii (Jenn.), Petit 
a 
CJ 
1 — > 
( Feb. 
Mar. 
Apr. 
May 
June 
>> 
»— > 
ta 
s 
< 
Sept. 
Oct. 
Nov. 
Dec. 
’04 I 
R,I 
I 
R 


— 
— 
I ! 
I 
I 
I, R 
’05 A 
A 
A 
A 
A 
A 
A 
— 
A 
A 
A 
A 
’06 A 
A 
A 
A 
A 
A 
A 
— 
— 
— 
— 
A 
’07 A 
A 
A 
A 
’04 .. 
R 
R 
X 
’07 .. 
S 
•• 
’04 .. 
I ! 
I 
I 
I 
’06 .. 
B 
B 
B 
B 
’07 — 
— 
— 
— 
B 
1 
^ : 
p 
— 
— 
I 
I 
I 
’05 .. 
.. 
H 
.. 
’06 .. 
« • 
• . 
— 
— 
B 
’07 — 
— 
— 
— 
B 
’05 A 
A 
A 
A! 
A, O 


A 
A 
A 
A 

’06 — 
’07 — 
A 
A 
T ! A 
A 
A 
A 
“ — 
“ 
— 1 
— ■ 
— 
’02 .. 
K 
’05 .. 
H 
• . 
’06 .. 
E 
’05 — 


A 
A 
A 
A 
A 
A 


_ 
’06 — 
— 
— 
A 
A 
A 
A 
’07 — 
— 
— 
— 
’05 .. 
# # 
’06 .. 
T, W 
T, W 
t’w 
T,W 
T,W 
— 
— 
— 
— 
— 
’02 .. 
.. 
K 
’05 A 
A 
A 
A 
A 
A 
— 
— 
— 
— 
— 

’06 .. 
. . 
A 
A, R 
A, R 
A, R 
R 
— 
— 
— 
— 
’07 — 
— 
— 
— 
•• 
’06 — 

T 
B, T 
B 
B 
’07 — 
— 
— 
— 
B 
’04 — 


. — 
— 
A 
: 

A 
A 
A 
A 
’05 A 
A 
A 
A 
A 
A 
A 
— 
A 
A 
— 
— 
’06 A 
A 
A 
A 
— 
— 
— 
— 
— 
— 
A 
A 
’07 A 
A 
A 
A 
A 
’06 .. 
B 
B 
B 




— 

’07 — 
— 
— 
— 
B 
’05 — 

A, H 
A, X 
A, O 
’06 — 
— 
A 
A, T, E 
’07 — 
— 
— 
Q, A 
B, A 
’02 .. 
K 
N 

’03 — 
— 
N 
N 
N 
G 
. , 
’04 .. 
. , 
• • 
N 
# , 
’05 A 
A 
A 
A 
A, O 
A 
— 
— 
A 
— 
— 
’06 A 
A 
A, W? 
A, W? 
C,A,W? 
A 
A 
’07 A 
A 
A 
A, S 
jugalis (Dillw.), Kiitz. 
longata (Vauch.), Kiitz. 
neglecta (Hass.), Kiitz. 
neglecla (Hass.), Kiitz., var. 
ternata , Ripart. 
nitida (Dillw.), Link 
quadraia (Hass.), Petit 
rivularis , Rabh. ? 
tenuissima (Hass.), Kiitz. 
varians (Hass.), Kiitz. 
Weberi, Kiitz. 
Ordinary type indicates sterile, Clarendon type reproductive condition ; where an exclamation mark is added, 
conjugation only was observed and no zygospores were seen. Wherever a species of Sp. is recorded in a pond from 
which a consecutive series was available its absence is indicated in other months by means of a dash. The letters 
refer to the different ponds, which are as follows : — 
A = Abbot’s Pool (series). K = Kew (cf. Fritsch, in Kew Q = Pond at Erquy (Brittany). 
B = Barton’s Pond (series). Bulletin, Addit. Ser. v, R — Sheen Common Pond. 
C = Coalville. 1906, p. 187, et seq.). S = Pond at Silverdale. 
E = Chessington. I = Telscombe Pond (series). T = Tiltham’s Pond (series'). 
G = Reigate N = Penn Ponds (series). W — Sydenham Wells Pond (series). 
H — Hendon. O = Portishead Pond (series). 
