TOO Dr. Goodenough and Mr. Woodward'/ Obfervathns on 



Fuci are alio more or lefs opake from a variety of caufes. Our 

 variety of fajligiatus called intercepts is in general opake ; but the 

 new branches produced beyond the rings at the extremity of the 

 frons, that is after injury received, arc green and fomewhat pellucid; 

 for in almoft all plants the parts repaired are of a fubftance and 

 texture weaker and fofter than the found parts. The F. palmatus- 

 is a remarkable in fiance of the difference of opacity — fome fpecimens 

 being thin as paper and pellucid, and others of a perfectly horny or 

 leathery fubftance when dried. There are a few Fuci, which may 

 perhaps hereafter be difcovered to belong to the genus Uha. We 

 fhall only mention ligidatus as an inftance: but as this (lands ar- 

 ranged among the Fuci by Mr. Lightfoot and Mr. Hudfon, we leave 

 it there, having no authority from any appearance of fructification 

 to difplace it. All Fuci are more or lefs pellucid and thin in their 

 flrfl beginnings. We have fpoken of their fubftance as it is more 

 generally obferved in properly grown plants. 



The fr.rucf.ure of the Fuci is fo very fmgular, that were they not 

 affixed by their bafe to the rocks, as terreftrial plants are by their 

 roots to the ground, we mould be at a lofs how to trace any kind of 

 analogy between them — and yet it has been a favourite employ- 

 ment with all writers ; and it countenanced Reaumur in his hypo- 

 thefis of Fuci being provided with male and female flowers. 



They are formed without leaves *, of one continued fubftancc, 

 of various texture, from the mod tender and membranaceous to the 



mofl 



* It may be objected, that we have faid the Fuci are formed without leaves, and yet 

 we take our two firfl divifions, foliis dijrinciis and foliis unitis, from that circumftance. It 

 is not that the plants of thofe divifions really have leaves, but only the appearance of them ; 

 and we adapt this appearance to the general language of the Linnsean fyftem. The 

 plants arranged under both thefe divifions do not make up a fifth part of the whole. By 



the 



