On Actinococcus and Phyllophora, 
BY 
OTTO VERNON DARBISHIRE, 
The Owens College , Manchester. 
With Plate XV and seven Figures in the Text. 
Credidienim et etiamnunc credo , iubercula ilia nihil aliud esse quam parasiticum 
quid . . . — Lyngbye, Tentamen Hydrophyt. Dan., 1819, p. 11. 
I N 1893 Schmitz published a paper, in which he discussed 
at some length the Actinococcus question. He main- 
tained that all so-called forms of fructification of Phyllophora 
Brodiaei (Turn.) J. Ag. which he had so far been able to 
examine, belonged in reality to a different Floridea growing 
parasitically on the former species (5, p. 371). This paper 
was shortly after reviewed by Gomont, who expressed his 
full agreement with the views held by Schmitz; so that 
the true nemathecia of Phyll. Brodiaei (Turn.) J. Ag. still 
remained to be found. 
Doubts had long been felt with regard to the true nature 
of the so-called nemathecia of Phyll . Brodiaei (Turn.) J. Ag. 
The few lines quoted at the head of this paper were written 
by Lyngbye in 1819 in describing these very same nemathecia. 
In the beginning of 1894 the author of this paper gave 
[Annals of Botany, Vol. XIII. No. L. June, 1899.] 
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