THE TASMANIAN FLOBA. 291 



28. TODEA. 

 Sori discoid, naked on the back of the leaf, usually massed and confluent. 

 Sporangia relatively large, red, and without an annulus. 



T. BARBARA, H. Leaves many feet long, twice divided. Ultimate pinnules 

 lanceolate, 1-1| inch long, acute, minutely toothed, attached by a broad base. 

 Growing ' into a massive or trunk-like base. P afrwana, Willd. ; Osmunda 

 harbara, Thun. 



George's Bay, Tasman Peninsula, Longley, Recherche, West Coast. 

 Temperate Australia to New Zealand ; also South Africa. 



HYDROPTERIDJE (Water Ferns). 



Spores of two kinds, contained in minute sporangia, which are themselves 

 contained in small, rounded, sessile or stalked sporocarps. Microspores usually 

 many, megaspores single in their respective sporangia., Small water or mud 

 plants, creeping. 



Leaves thread-like ... ... ... ... ... 1. Pilularia. 



Leaves crowded, oblong ... ... ... ... 2. Azolla. 



1. PILULARIA. 



Sporocarps sessile at the base of the leaves, \ inch long, hairy and hard, 

 4-celled, containing both micro- and mega-sporangia. 



P. GLOBULirBRA, Linn. Stem slender, creeping for a few inches. Leaves 

 green, thread-like, distant, 2-.3 inches long. Creeping in mud in shallow lakes. 

 Formosa, Penquite, Ben Lomond, &c. In all temperate climates. 



2. AZOLLA. 



Sporocarps sessile on the upper surface and towards the axils of the lower 

 leaves. Megasporange smaller, and by the side of the microsporange. 



A. FiLicuLOiDBS, Lam. Stem creeping for a few inches. Leaves broadly 

 oblong, pointed, crowded, and overlapping, j inch long. Microsporangia as 

 large as the leaves. A. rvbra, H. 



Circular Head, Brighton, &c. South and East Australia to New Zealand ; 

 also America. 



