158 THE MARINE BOTANIST. 



part of the fronds decay s^ and there remains alone 

 the naked stem, which then bears the fructification, 

 either in tubercles on Httle stalks, or tetraspores 

 produced in little leaf-like bodies. A variety of 

 this plant is sometimes found with lobed leaves j 

 the midrib divides near the tip, in the specimens I 

 have seen at Minehead, on the Somerset coast, and 

 the leaf, in consequence, becomes bifid at the 

 extremity. The lobed variety gathered by Dr. 

 Landsborough on the Ayrshire coast, is a very 

 curious form ; according to Dr. Harvey, showing a 

 tendency towards D. sinuosa in form, from which, 

 in colour and other characters, it widely differs. 

 Substance, delicate ; adhering firmly to paper. 

 Grows in deep rock-pools, between tide-marks, 

 generally at the shady side of the pool, under pro- 

 jecting ledges of rock. Common on the British 

 coasts from Orkney to Cornwall. Biennial. Very 

 large in the Scilly Isles, and at Falmouth. In a 

 specimen which I procured from Gwyllyn Vase 

 Bay, near there, the fionds are nearly ten inches in 

 length. 



