NATURAL HISTORY. 
8 Z. Quininum. Dillw.t.3. E. Bot. t. 1656. 
(ConF. Sprrauts.) The species of this singu- 
lar genus are found in ditches and stagnant ponds. 
CONFERVA. 
With uniform jointed filaments which are either 
simple or branched,—the articulations filled with 
minute sporules, 
1, Simple. 
1. C. Ericetorum. Dillw.t.1. E. Bot. t. 
1553. Bovey heathfield. 
2 jC. Capitnaris. Dillw.t.46. (C. Cris- 
pA.) This species is rigid and brittle when dry. 
It is found in ponds near the sea. 
3.) RivuLaris.  “Dillw.t. 59.’ E. Bot. t. 
1654, In slow streams. 
2. Branched, 
a, Not aquatic, 
4, CC. Vexutina. Dillw. t. 77. Spreading 
in a green velvet-like manner on the surface of 
the ground, 
db. aquatic, 
oC. Fracra. Dillw. t.. 14. 
