 Azolia,) SALVINIACEA. 1265 
_ Macrospore, from which a rudimentary oR is produced. 
Microsporangia containing numerous microspor 
Leaves entire, with oe anastomosing venation ; ane ney 
free within the concep ta 
Leaves small, deeply a each lobe 1-nerved only ; microsporangia 
Aggregated within the conceptacle in massule with a membranous cuticle 
Azolla. 
1153. Salvinia Schreb. 
_ Fugacious, annual, aquatic herbs, with slender, floating stems 
bearing short-petioled or sessile leaves on the upper side, and 
S short, conceptacle-bearing branches and much-branched, feathery 
: toot-fibres on the lower side; leaves small, simple, with a distinct 
_ midrib running from base to apex, and a close erecto-patent, 
_ Secondary nervation connected by a few looped veins. Concep 
“ tacles globose, membranous, indehiscent, seated in clusters on 
a — branches of the floating stem, 1-2 of each cluster containing 
10 or more turbinate macrosporangia, each with a single macro- 
_ Spore, several of each cluster containing very many globose micro- 
_ Sporangia, much smaller than the macrosporangia, each wi 
: y minute microspores. Sporangia of both kinds borne on a 
_ Much-branched, filamentous receptacle. 
- Fronds horizontal, fl 
Fronds suberect, ih a edges 
2851. Sanvinra NATANS Hoffm. S. verticillata F. I. 745 (Ed. 
C. B.C. 
cucullata 
N. Henpal; Tirhut. 
A small, floating, annual herb. 
2852. Sanvrnza cucuLLaTa Roxb. ; F. I. 745 (Ed. C. B. C.). 
In all the provinces. 
A small, floating, annual herb. 
1154. Azolla Lamk. 
___ Fagacious, annual, aquatic herbs; stems copiously branching ; 
leaves sessile, minute, densely imbricating, deeply-lobed, each 
tobe with a single midrib; root-fibres on the lower ite copiotts, 
- Simple or ioathove solitary or fascicled. Conceptacles in the axils 
= the leaves of two kinds: one larger, membranous, globose, con- 
numerous microspores, aggregated in massule, covered by 
a ‘Membranous cuticle, and borne on a branched, fl iform recep- 
* 
