THE MARINE BOTANIST. 49 



HALISERIS POLYPODIOIDES.— ENTIRE- 

 LEAVED HALISERIS. 



Fronds from four to twelve inches high, repeatedly 

 forked and furnished with a strong midrib ^ the 

 margin always entire. The spores occur in lines on 

 each side the midrib, or dispersed in small spots 

 over the face of the frond. Colour a brownish or 

 yellowish olive. Substance delicate and membra- 

 naceous, not adhering well to paper in drying. The 

 smell of this is very pimgent and disagreeable when 

 first gathered. Grows on rocks and stones in tide- 

 pools, and in from four to five fathom water. 

 Biennial. Several stations on the south coast of 

 England. 



PADINA. 



Name invented by Adanson, who has not explained its 

 meaning. 



Boot coated with woolly fibres. Frond flat, fan- 

 shaped, marked at regular distances with concentric 



