II 



OTTO VERNON DARBISHIRE. 



second paper just mentioned the author again expressed it as his opinion 

 that the so-called nemathecia of Phyll. Brodiaei did really represent the 

 true tetrasporic fructification of this Floridea (2, pp. 2 sq., 23 sq., 36). 



The subject has not been worked at by algologists since, and Schmitz' 

 theory has therefore naturally been most generally accepted. Kolderup 

 Rosenvinge alone seems to have adopted an opposite view (4, p. 33). 



Since commencing work on the anatomy and development of 

 Phyllophora in 1892, the author has devoted much time to the exami- 

 nation of all forms of fructification found on it. Up to 1896 opportunity 

 was however wanting for dredging and examining fresh material during 

 the months of September and October, owing to the author's absence 

 from Kiel during that time. Practically all the material used in these 

 investigations was collected in the Baltic near Kiel. The observations 

 carried out up to this point indicated that the one conclusion to be 

 drawn was that the so-called (Actinococcus) nemathecium of Phyll. 

 Brodiaei was really the genuine tetrasporic fructification of that plant. 



Fig. 1. Nemathecia of 

 A ctinococcus roseus ( Ly n gh . ) . 

 Kold. Rosenv. on Phyllo- 

 phora Brodiaei (Turn. ) J. Ag. 

 Nat. size. 



Fig. 2. Nemathecia of 

 Actinococcus roseus (Lyngb). 

 Kold. Rosenv. on Phyllo- 

 phora Brodiaei (Turn. ) J. Ag. 

 Nat. size. 



In 1896 for the first time specimens of Phyll. Brodiaei w T ere dredged 

 and preserved at all times of the year. This was continued up to 



