AZOLLA AND SALVINIA. 



549 



It may be worthy also of remark, that in proportion as 

 Acotyledonous plants become, so to speak, less pistilligerous, 

 their vegetative organs appear to be more developed. This is 

 evident if a Fern be compared with a Moss. And it seems to 

 be so closely followed up, that Salvinia which has less, per- 

 haps, of the atropous pbaenogamous ovulum than Azolla, has 

 its organs of vegetation considerably more developed. 



Familia. — SALVINIDiE, Bartl. 

 Pars Rhizospermarum. Roth. D. C. Rhizocarpeamm. 

 Batsch. Marsileacearum, Br. 



Plantce natentes, ramosse. Rodices plumosse. Folia opposi- 

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

 pedicelli ovuligeri ? vel filamenta moniliformia partium novel- 

 larum. Organa fceminea ; Ovula atropa, (submersa), solitaria 

 vel per paria. Capsulaf submersse, apice micropyle notatse, 

 alice% (infima cujusque paris vel racemi) includentes saccum§ 

 luteum, vel plures, (et tunc singuli in capsula secondaria re- 

 conditi,) materie granuloso-viscosa, oleaginosa farctum et in- 

 crustatione e maxima parte tectum. Alice (superiores cujus- 

 que paris vel racemi) continentes capsulas secondarias|| 00, 

 globosas, pedicellos simplices terminantes, singulis includenti- 

 bus massarn^ (vel massas 2-3) aspectu cellulosam, in qua 

 sporcB immersae. 



* 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 situation. But their development is opposed to 

 this, as also their opposition in Salvinia. 



t Calyx. Schreber. Indusium. Willd. Mart. Fl. masculi et faemtnei. 

 R. Br. Receptacula. Sprengel. Organa propagatoria. Mart. Endlicher. 



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

 ct faeminea. Mart. Endl. Indusium. Calyptra. Mart. Endlich. 



§ Gongylus. Mart. Vesicula basilaris. Endl. 



II Fl. Masc. Antheree. Sehreb. Fl. Fa>m. Meyen. R. Br. Capsula? 

 partiales, R. Br. Mart. Organ, faem : masc. Sporangia. Mart. Endl. 

 Indusia Mart. Meyen. Globuli. Endl. 



H Semina Br. Grana. Endl. Granula Mart. 



