CXXViii. GENUBA OP TEENS : 



lobed, two to four valved, containing about 4, rarely 1 3 or 8 

 larger spores or corpuscles. Fructifications in the axils of bracts 

 collected in four rows into spikes which are four-sided. 



Jungermannia-like or fern-like plants, frequently creeping ; the 

 stems usually much dichotomously branched, clothed with leaves 

 of two forms, disposed in four rows. The fructifications form 

 angulate spikes. This genus is separated from Lycopodiwm, on 

 account of its producing two kinds of spore-cases. The stems 

 usually bear two kinds of leaves, the larger disposed in a disti- 

 chous manner, stipuliform ones being placed between them. 

 Stachygynandrium. Leaves monomorphous, disposed in several rows. 



Order MAKSILEACEJE. 



182. ISOETES, Linnaus, Itin. Scan. 420; Id., Gen. PI 



ed. 5., 1048. 

 CA.LAMABIA, Dillenim, 



Spore-cases sessile, solitary in the axils of the (radical) leaves, 

 adherent to their excavated dilated base, one-celled, traversed by 

 delicate thread-like receptacles ; of two kinds : (1) antkeridia, 

 those of the central leaVes, containing very numerous minute 

 oblong spores ; (2) oophoridia, those of the outer leaves, con- 

 taining numerous larger globose-tetrahedral spores. 



Submersed aquatic plants, with a thick succulent tuberous 

 rhizome or crown, and awi-shaped radical leaves, at the base 

 of which the fructifications are borne. They have very strong 

 affinity with Lycopodiwm, 



Ei. : 1. lacustris, Lin. \ I. Engelmanni, A. Br. 



