274 
XXIV. Thongs. Crypt. AIgsc. 
924. Plumb Laver. — U. pruniformis. 
Roundish, single, succulent within. — Wei- 
gers obs. II. 4. 
On Moss, October, A. Rare. 
On the Bath at Wrest Park. 
Obs: 
Green, not bigger than a Sloe. 
River-zveed. Conferva. Gen. PI. 1672. 
P'ibres simple, uniform, fine as a hair, thread- 
like. 
925. Cotton Conferva. — C. bullosa. 
Threads equal, branched, matted, inclosing 
bubbles of air. — Dillenius. III. ii. 
Ditches, March, A. Common. 
926. River Conferva. — C. rivularis. 
Threads very simple, equal, very long. — 
Dillenius. II. i. 
Ditches, January, P. Common. 
Ohs : 
Plant foating, silky. 
927. Mill Conferva. — C. canalicularis. 
Threads equal, more branched towards the 
base. — Dillenius. IV. 15. 
Mill-ponds, January, P. Common. 
Obs: 
Threads ^ to ^ inches long, branches matted. 
Amphibious 
