Classification of Ferns and Fern Allies. 
4i 
ORDER IV. — SELAGINELLACEzE. 
Capsules of two kinds placed in the axils of leaves or bracts, 
those with large spores having several spoies in each capsule. 
Genus XLI. — Selaginella. Capsules one celled, two 
valved, arranged in the axils of bracts in a terminal spike ; 
the smaller kind toward the apex, and the larger kind 
toward the base of the spike. 
Genus XLI I. — Tsoetes. Capsules one celled, placed in the 
axils of the ordinary rush-like leaves ; those with large 
spores in the outer leaves, and those with small spores in 
the inner. 
ORDER V.— RHIZOCARPEZE. 
Spores of two kinds, the sporangia for the larger spores con- 
taining only one. 
Genus XLIII. — Azolla. Capsules in the axils of the leaves, 
of two kinds, the larger round containing numerous minute 
spores, the smaller ovoid containing one large spore. 
Genus XLIV. — Marsilia. Sporangia of large and small 
spores both attached together in groups, which are fastened 
to a mucilaginous connecting cord, and enclosed in the 
two-valved stalked capsule. 
