2 SALVINZE.S:. 



183. SALVINIA, MicJieli, Gen. 107, t. 58} Sckrel. Gen. 



Plant. 1617. 



Spore-cases (Conceptacles) clustered in short distichous cymes 

 terminating short leafless branches on the under side of the 

 stems; thin, globular, bursting irregularly, one-celled, containing 

 bodies of two kinds : (1) antheridia, consisting of numerous 

 minute spherical vescicles, borne on branching pedicels from a 

 central receptacle, and full of small spores ; (2) oophoridia, con- 

 sisting of larger bodies, short stalked, on a central receptacle, 

 each including a single large spore. 



Floating branched plants, with sessile entire imbricated, cel- 

 lular leaves above, the fructifications growing on short leafless 

 branches from the under side of the stems, surrounded by long 

 rootlets. 



Ex. : S. natans, Hoffm. \ S. oblongifolia, Martiug. 



184. AZOLLA, Lamarck, Encyc. Sot. i. 340. 



CARPANTHUS, Bqfinesque; REIZOSPEEMA, Meyer. 



Spore-cases (Conceptacles) binate on short branches at the 

 base of the pinnae, on the under side of the stems, one-celled, of 

 two kinds : (1) antheridia, consisting of ovate-oblong bodies, 

 opening transversely, and containing several roundish angular 

 spores on a central erect column ; (2) oophoridia, consisting of 

 globose bodies, bursting irregularly, and containing spherical 

 vescicles rising from the base on slender stalks, each containing 

 globular hairy spores. 



Floating pinnately-branched plants, with minute cellular im- 

 bricated leaves, the fructifications growing on short branches 

 which proceed from the under surface of the stem at the base of 

 the pinnae. 



Ex. : A. filiculoides, Lam. I A. microphyUa, Klfs. 



A. pinnata, S. JBr. A. rubra, B. r. 



A. caroliniana, Willd. \ A. aMcana, Desv. 

 [October, 1858.] M 



