(78) 



The entire habit of the present ciirious plant is that of one of the 

 fohaceous lichens, and were a person, unacquainted with the plants, to 

 see a specimen of the present Alga placed side by side with some of the 

 paler forms of N^ephroma restqnnata or Parmelia omphalodes, he would 

 not, we suspect, very unhesitatingly say that they were not the same, 

 so like are the appearance and mode of growth of the species. 



The species is said to prefer calcareous rocks, old shells, and beds of 



Nullipores, and in such situations is perhaps not \infreqiient round the 



coasts. The fructification seems to be unknown in this country, and has 



only been found in Sweden by Areschoug, who describes the spores as 



ected in undefined sori, neai- the base of the frond. — Phyc. Brit. 



ZONARIA PARVtJLA. 



EXPLANATION OF DISSECTIONS, &c. 



Fig. 1 . — Zonaria parvula, natural size. 

 2. — Surface cells. 

 3. — Underside of frond and fibres. Both magnified. 



