SALVINIACB^. 271 



Synopsis of the Geuera. 



1. gelaginel'Ia. Terrestrial. Stem slender. Leaves small. Spore- 



cases very small, axillary, some containing the orange-coloured 

 powdery microspores, and others with 3 or 4 larger macrospores. 



2. Iso'etes. Growing in water. Stem corm-like. Leaves elongated 



and rush-like. Spore-cases large, enwraijped hy the spreading 

 bases of the leaves. 



1. SELAGIIVGL'LA, Beauv. 



S. rupes'tris. Spring. A little moss-like evergreen, grow- 

 ing on exposed rooks in dense tufts 1-3 inches high. Leaves 

 awl-shaped, with a grooved keel, and tipped with a bristle. 

 Spikes 4-oomered. 



2. ISO'EXES. L. QUILLWOKT. 



I. echinos'pora, Durieu, var. Bpaun'ii, Engelm. (Quill- 

 wort. ) A small aquatic grass-like plant with a corm-like 

 stem, bearing 15-30 slender leaves. The large sporangia 

 axillary, partly enwrapped by the thin edges of the exca- 

 vated bases of the leaves, beset with small spinules.— Lakes 

 and ponds, chiefly eastward. 



Order CXVI. SALVINIA'CE.ffi. 



Small floating moss-like plants, with branching axis, 

 covered with minute 2-lobed imbricated leaves. Sporooarps 

 in pairs beneath the stem, very soft and thin-walled, the 

 smaller ones acorn-shaped, containing a single macrospore, 

 the larger ones globose, containing several microspores. 



AZOI/KA, Lam. 



A. Carolinia'na, Willd. Somewhat deltoid in outline, 

 much branched, of reddish aspect. Pleating on qjiiet wat- 

 ers of Lake Ontario, not common. 



