THE MARINE BOTANIST. 167 



of Devon. Whitsand Bay, near Plymouth. Fal- 

 mouth Bay, " very rarely." Ilfracombe. Mine- 

 head, Somerset : not unfrequently cast ashore 

 there; I. G. Bantry Bay. Kilkee. Several 

 stations on the north-east coast of Ireland. 



NITOPHYLLUM LACERATUM.— TORN 

 NITOPHYLLUM. 



Fronds from two to ten inches long, very much 

 divided, forked into variously cleft segments often 

 ciliated at the margin, and marked with veins 

 running through the frond. When in the water it 

 appears of a silvery hue. When dry the colour is 

 nearly the same as that of H, Gmelini, Tubercles 

 scattered; tetraspores in ohlong spots along the 

 margin, or in distinct leafy processes. In the 

 variety /3 uncmatum the fronds are very narrow, 

 with the tips hooked into the form of a sickle. 

 Grows on various algae, common. Annual. 

 Summer. 



