252 On Azolla and Salvinia. 



Familia.— SALVINID/E, Bartl. 



Pars Rhizospermarum. Roth. D. C. Rhizocarpearum t 

 Batsch. Marsileacearum, Br. 



Plant® natantes, ramosae. Radices plumosae. Folia opposi- 

 ta,* pagina supera papillosa. Organa mascula; pili articulati 

 pedicelli ovuligeri ? vel filamenta moniliformia partium novel- 

 larum. Organa famine a ; Ovula atropa, (submersa), solita- 

 ria vel per paria. Capsulcef submersae, apice micropyle no- 

 tatae, ali<e% (infima cujusque paris vel racemi) includentes 

 saccum§ luteum, vel plures, (et tunc singuli in capsula secon- 

 daria reconditi,) materie granuloso-viscosa, oleaginosa farc- 

 tum et incrustatione e maxima parte tectum. Alice (superi- 

 ores cujusque paris vel racemi) continentes capsulas secon- 

 darias|| 00, globosas, pedicellos simplices terminantes, singulis 

 includentibus massam\ (vel massas 2-3) aspectuc ellulosam, 

 in qua sporcc immersse. 



Sub-Familia. — Salvininje. 



Radices verticillato-fasciculatse, nudse. Folia opposita, integra, pe- 

 tiolata, pilis articulatis superne vestita, vernatione induplicata. Orga- 

 na mascula ? pili** simpliciter articulati siti in pedicellum ovuli. 



* The leaves are not quite opposite in Azolla : this combined with the obvious 

 conduplicate vernation of these organs in Salvinia, inclined me to believe, that 

 they were bilobed in Azolla ; a conduplicative vernation would then explain their 

 istuation. But their development is opposed to this, as also their opposition in 

 Salvinia. 



f Calyx. Schreber. Indusium. Willd. Mart. Fl. masculi et faeminei. R. Br. 

 Receptacula. Sprengel. Organa propagatoria. Mart. Endlicher 



% Flos, faemineus. Schreb. Fl. Masc. R. Br. Meyen. Organ, masc ? et faeminea. 

 Mart. Endl. Indusium. Calyptra. Mart. Endlich. 



§ Gongylus. Mart. Vesicula basilaris. Endl. 



|| Fl. Masc. Antherae. Schreb. Fl. Faem. Meyen. R. Br. Capsulae partiales, R. 

 Br. Mart. Organ, faem : masc. Sporangia. Mart. Endl. Indusia Mart. Meyen. 

 Globuli. Endl. 



If Semina Br. Grana. Endl. Granula Mart. 



** These curious filaments have in some respects a centrifugal development : 

 the cells of the base, or next the axis, being the least developed as regards number 

 of granules. These, which are very irregular in size, are exceedingly mobile. The 

 action appears to cease at last from want of room, for the cells become literally 

 crammed with the granules. 



