nate. It is perhaps most nearly allied to Ch. fimfolia, or to the 

 North American Ch. alro-purpurea, but from both it differs in 

 the strongly compressed or sometimes flattened frond, the small 

 size, and comparative slenderness. As yet it has only been found 

 on Zostera leaves, at the Island of Rottnest, where it is not very 

 uncommon. 



Fig. 1, Chondhia lanceolata ; a tetmspore-ht^axw^ specimen. 2. k cysto- 

 ca/'j9-bearing specimen : — both the natural size. 3. Earauli, bearing cysto- 

 ca7'ps. 4. A cluster of spores, from the same. 5. Hamuli, bearing tetra- 

 spoj'es. 6. h. tetraspore : — variously magnified. 



