On Azolla and Salvinia. 257 



* Americanae. Radices simplices. Lobi corporis (capsular 

 calyptratim dehiscentis) 3, pyriformes. Masses (capsular se- 

 condaries pedicellatae) 6-9, globosae, subcompressae, margine 

 pilisf glochidiatis instructae. 



** Asiaticae. (Rhizosperma. Meyen. op. cit. p. 523.) Ra- 

 dices partim vel omnino plumosae. Lobi corporis (capsular 

 calyptratim dehiscentis) 9, angulati, (3 superiores majores, 

 6 inferiores.) Masses (capsular secondariae pedicellatae) 2-3, 

 extus convexae, intus concavae et processubus radicellifor- 

 mibus 3-4 instructae. 



Superficies infer a immersa glabra. Ovula basi proces- 

 sibus paraphysiformibus stipata. Capsular rubro plus minus 

 tincta, parietibus simplicibus ; inferior (paris difFormis) ob- 

 longo-ovata, superior subglobosa, superficie rugosa. Sacci 

 lutei tegumentum nigrosanguineum. 



Habitus Jungermannice. 



Affinitates incertae. Analogiae cum Gymnospermis phane- 

 rogamicis et Lemnaceis. 



A. pinnata, circumscriptione triangulari-pinnata, foliis su- 

 perioribus papulosis, radicibus longitudinaliter phimosis. J 



A. pinnata, R. Br. Prod. p. 23. 



Salvinia imbricata, Roxb, Crypt. PI. Cal. Jour. Nat. 

 Hist. IV. p. 470. 



A minute floating plant with the habit of Jungermannia. Stem 

 so branched, that the general outline of the whole plant becomes 

 triangular. Roots solitary, arising from the stem at the origin of 



t The situation and structure of these hairs require I think further examina- 

 tion. As regards the first it appears to me, that whether scattered over the 

 whole surface, or only along the margins, they would he visible while contained 

 in the secondary capsule, yet neither Martius nor Meyen represent them as being 

 so. And as regards the second, the hairs of Azolla pinnata do not appear to me 

 organically cellular. 



$ Char. ex. immort. Prodr. 



