898 DESCRIPTION OF A NEW SPECIES OF FUCUS. 



and indefatigable industry of Mrs Griffiths, from 

 whom I received specimens in April 1820. In its 

 mode of growth, F. Devoniensis most nearly re- 

 sembles F. Norvegicus, and might be easily mis- 

 taken for it ; but upon a closer investigation, an es- 

 sential difference is immediately discernible in its 

 crowded and smaller tubercles, which appear to be 

 confined to the apices, and are equally prominent 

 on both sides the frond ; a sufficient character to 

 distinguish it from JF. Norvegicus, the only plant 

 with which it is liable to be confounded, unless, 

 perhaps, we except some of the varieties of F. cris- 

 pus 9 from which Mrs Griffiths observes, its sub- 

 stance and mode of ramification sufficiently distin- 

 guish it, independent of its totally different fruc- 

 tification. F. Devoniensis appears to have a strong 

 proliferous tendency ; and, after suffering an injury, 

 will throw out three or four new fronds from the same 

 extremity. From one specimen in my possession, 

 I am inclined to believe, that an old frond may pro- 

 duce new stems from its summit, without any pre- 

 vious injury ; for I have detected capsules in the 

 centre of the plant, that were once evidently at the 

 extremity. 



Mrs Griffiths, to whom I am indebted for many 

 of the above observations, discovered this plant on 

 Waldon rocks, Torbay, on the 14th of February 

 1820. 



