PILULARIA. 
203 
Hooker considers it identical with the Isoetes lacustris ; 
and the same distinguished botanist has it from North 
America, British Columbia, and South America. 
56. Isoetes Durisei, Bory. Dur£@n f s Quillwort. 
Bulbous, scaly below. Leaves slender, spreading, and arched. 
Bud-like seeds granulated. 
Durieu’s Quillwort is a smaller plant than the com- 
mon species; it grows on damp 
ground in southern climates, 
its only British habitat being 
in Guernsey. The leaves are 
not thick and erect, but slen- 
der and much curved. 
This plant grows abun- 
dantly in the south of France, 
Algeria, and many parts of 
Spain. Few botanists visit the 
Lakes of Cumberland and 
Westmoreland without bring- 
ing away specimens. 
PILULARIA. 
Gen. Char. Fructification of two kinds contained in a globular 
capsule, which opens by two valves at the apex. 
Name from pilula, a little pill. 
57. Pilularia globixlifera* Linn. Common Pillwort. 
Caudex creeping, rooting at short distances. Leaves slender, 
rush-like, and cylindrical. Capsule stalked. 
The Common Pillwort creeps along ground that has 
