THE FRESH-WATER ALGAE OF ESSEX. 179
S. oscillarioides, Turp. Cooke, t. 96, f. 3. In ditches,
Epping (G.E.M.).
Oscillaria tenerrima, Kutz. Cooke, t. 96, f. 4. In ditches,
Chingford.
O. tenuis, Ag. Cooke, t. 96, f. 8. In ditches, Kelvedon
(E.G.V.) ; Chingford.
O. muscorum, Carm. Cooke, t. 98, f. 8. On Hypnum,
Kelvedon (E.G.V.).
O. limosa, Ag. Cooke, t. 97, f. 3. In ditches, Kelvedon
(E.G.V.).
O. nigra, Vauch. Cooke, t. 97, f. 6. In ditches, Kelvedon
(E.G.V.).
Microcoleus terrestris, Desm. Cooke, t. 99, f. 2. On the
ground, Kelvedon (E.G.V.)
Lyngbya vulgaris, Kirsch. Cooke, t. 102, f. 5. On the
ground, Kelvedon (E.G.V.).
Gloiotrichia natans, Thur. Cooke, t. 116, f. 1. In ditches,
Feering (E.G.V.).
G. pisum, Ag. Cooke, t. 116, f. 2. In ditches, Epping
(G.E.M.).
BATRACHOSPERMAE.
Batrachospermum moniliforme, Roth. Cooke, t. 120.
In ditches, Kelvedon ; Rivenhall (E.G.V.) Var. confusum, Hass.
Cooke, t. 123. Feering; Coggeshall; Kelvedon (E.G.V.). Var.
stagnale, Ag. Kelvedon ; Coggeshall (E.G.V.).
B. vagum, Roth. Cooke, t. 125. In ditches, Rivenhall
(E.G.V.).
B. atrum, Harv. Cooke, t. 126, f. 1. In ditches, Kelvedon
(E.G.V.).
DOUBTFUL SPECIES.
Lyngbya thompsoni, Harv. Hass., p. 222. On stick in a
pond, Kelvedon (E.G.V.).
L. punctalis, Hass. Hass., t. 60, f. 4. In an aquarium,
Kelvedon ; Felix Hall (E.G.V.).
L. vermicularis. Hass., t. 60, f. 5. In ditch, Feering ; Tip-
tree Heath (E.G.V.).
L. cinerea (Oscillatoria, Hass.). In ditch, Kelvedon
(E.G.V.).
N 2