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above the surface of the sea when unusually low water occurs and 
such low water needs not to be of long duration in the tropics 
to cause the parts of the algæ which reach over the sea to be 
burnt and killed by the sun. And it is just under such conditions 
that I think Howe's plants have been living. If we suppose that 
the flabellum has been killed nearly down to the stipe, and the 
water has later been rippling over the plants, it seems to. me very 
probable that the lowest part of the: flabellum and the uppermost 
part of the stipe may.have been shredded. into more or less tatters 
and threads such as we find in C/adocephalus scoparius. 
However this may be the question at all events arises what 
the name of my plant should be. As already pointed out, my plant 
has several points in common with the genus Avrainvillea but it 
agrees also very much with. Udotea, though not in such a way 
that it may naturally be placed in any of these genera. The most 
natural thing would surely be to refer it to a special genus and 
as my plant, setting aside the outer. habit, quite agrees with Howe's 
genus Uladocephalus I think it right to refer it to this genus; 
the species-name. on the other hand may be /uteofusca Crouan, my 
plant as mentioned above agreeing quite well with this species. The 
name of the plant must therefore in my opinion be Cladocephalus 
luteofuscus (Crouan) Bårgs. 
June 1908. 
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