216 THE MARINE BOTANIST, 



and tapered at the base and tips; tender and 

 gelatinous in substance. Colour a dull purple, 

 sometimes greenish or yellowish when growing in 

 shallow pools. The favellce are at times abun- 

 dantly scattered over the frond ; and Dr. Harvey 

 has recently contradicted the statement which he 

 formerly made in the ^^ Phycologia/' and in his 

 last edition of the " Manual of British Algae/' to 

 the effect that the tetraspores of this plant were 

 rare — subsequent observation having assured him 

 that they are of very common occurrence. In 

 the variety /3 crispata, the fronds are flattened, 

 cmiously curled and twisted, arising from the base ; 

 in other forms the branches proceed from a main 

 stem, and are not above two or three inches high. 

 Grows on rocks and stones in pools between tide- 

 marks; jS crispata in places exposed to tidal 

 streams or currents. Common. Annual, Summer. 



