I. Historical Account. 
he reproduction of Phyllophora Brodiei (Turn.) J. 
EF has been much disputed for more than a 
century. Everywhere within the area of this Subarctic- 
North-Atlantic species globular bodies of various sizes, up 
to 3,5 mm. in diameter, have been found sessile on the up- 
per border of the frond or on particular small shoots. 
TURNER who first described it in 1809 (Turner 1809, plate 
72) as a species different from Ph. membranifolia stated 
that the small spherical tubercles were composed of “jointed 
parallel, fibres, closely matted together, and mixed with 
irregularly rounded seeds”. LyNGBYE (1819, p. 11) was much 
in doubt as to whether these tubercles were really the 
fructification of the alga; he did not succeed in finding 
the seeds described by Turner and stated that he had 
earlier described and pictured these fruits in ms. under 
the name of Cha@tophora membranifolii, thinking that it 
was some parasite growing on Ph. membranifolia and 
so giving it the character of Ph. Brodiei. On the authority 
of Turner, however, he maintains the latter species. 
In 1834 LyNGBYE took up again more positively the 
hypothesis of parasitism of the tubercles, giving in Flora 
Danica tab. 2135,, a picture of the filaments composing 
the tubercles with the text here reproduced: Chatophora 
subcutanea Lyngb. Mnscr.: cespite roseo, filis, stellatim 
radiatis, simplicibus et ramosis moniliformibus. — Chæto- 
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