AZOLLA AND SALVINIA. 



551 



Habitus Lemnaceo-Pistoideus, 



Characters specierum forma foliorum, dispositione et nu- 

 mero papillarum, situ radicum, et numero et dispositione cap- 

 sularum deducendi. 



8. verticillata, foliis parallelo grammico-oblongis subpan^ 

 duriformibus canaliculatis, pilis ternis vel quaternis papilhs 

 (conicas) superficiei terminantibus, 



S. verticillata, Roxb. Crypt. PL Cat. Jour. Nat. Hist. IV. 

 p. 469. 



Hab. — Stagnant waters. Bengal. 



Descr. — Floating, sparingly branched. Stem, stalks and under- 

 surface of leaves thickly covered with stout subulate brown hairs, 

 the terminal cell of which is suddenly attenuated. Leaves paralle- 

 logrammic-oblong, constricted about the centre so as to be sub-pan- 

 duriforin. channelled down the middle. Hairs in threes or fours 

 arising from conical papillae of the Surface : terminial cells brownish, 

 withered-looking. 



Boots terminating, short, descending stalks, generally about 12, 

 disposed in two series around the lower reproductive organ, which 

 occupies the centre. Mixed with the radicles, especially in the 

 young parts, are articulated colourless filaments, the component parts 

 of which contain unequal granules. 



Male organs ? articulated hairs on the stalks of the ovula ; each 

 joint containing a nucleus and a brownish fluid. 



Ovula nearly sessile concealed by the roots, and partly covered 

 with hair9. 'Tegument open at the top. 



Mature reproductive organs solitary, or in racemes of 3-5, about the 

 size of a pea, covered with brown rigid hairs. The upper ones of 

 each raceme, (or lowest as regards general situation,) contain innu- 

 merable sphserical bodies, of a brownish colour, and reticulated cel- 

 lular surface, terminating capillary simple filaments. These again 

 contain a solid whitish opaque body. 



The other, which occupies the lowest part of the raceme, and 

 which is the first and often the only one developed, is more oblong, 

 containing 6-18 larger, oblong-ovate bodies on short stout com- 

 pound stalks : oolour brown, surface also reticulated. Each contains 

 a large, embossed, opaque, ovate, free body, of a chalky aspect : it 



