SETCHELL— PARASITISM AMONG RED ALG^. 161 



1895. Later, in 1899, however, Darbishire, after the death of 

 Schmitz in 1894. pubhshed the results of further investigation 

 which resulted in finding the germinating stages of Actinococcus 

 in the antheridial cavities of the PhyUophora and came to the same 

 point of view as Schmitz. This point of view was also confirmed 

 by the investigations of Gomont (1894). 



In 1894 Kuckuck described the tetrasporangial plant of Harvey- 

 ella mirahilis (Reinsch) Schmitz et Reinke, under the name of 

 Choreocolax alhus, and in 1895 Batters published the genus Callo- 

 colax of Schmitz, a genus whose single species is parasitic on Callo- 

 phyllis, which is very closely related to itself. 



In 1896-97 appeared those parts of Engler and Prantl's 

 " Natuerlichen Pflanzenfamilien " dealing with the red algse and 

 with whose preparation Schmitz had long been busy. The genera 

 of parasitic red algse were worked over either by Schmitz himself, 

 or by Hauptfleisch or, in case of the Rhodomelace?e, by either 

 Schmitz or Falkenberg. The total number of genera of parasitic 

 red algse was increased from the eight detailed in 1889 to nineteen, 

 the five genera proposed as new in this work belonging entirely to 

 the Rhodomelacese and parasitic on other members of the same 

 family. 



Since 1897, additions have been made to the list of both genera 

 and species of parasitic red algse. One genus already proposed, 

 viz., Callocolax, was not included in the Engler and Prantl account. 

 This makes twenty genera known up to the close of 1897. Rosen- 

 vinge added Ccratocolax in 1898 (p. 34) and in the same year Foslie 

 (1898, p. 7) created the genus Clicrtolifhon to receive the Mclobcsia 

 deformans Solms. Falkenberg (1901) in his monograph of the 

 Rhodomelacese, published more detailed descriptions and figures 

 of the various parasitic genera of this family previously proposed 

 by Schmitz and by himself, but added no new genera. In 1905, 

 Setchell and Lawson (cf. Setchell, 1905, p. 7) proposed the genus 

 Peyssonneliopsis and in 1910 Setchell and Wilson) cf. Wilson, 1910, 

 p. 81) proposed the genus Gracilariophila, which from their point 

 of view is a Gracilaria-\ike genus parasitic on a Gracilaria (cf. how- 

 ever Eddelbiittel, 1910, p. 230, 231, and Svedelius, 191 1, p. 220 ). 



In 1913, Yendo (p. 283) described and figured a most interesting 



