1914] Setchell: Parasitic Florideae, I 17 



Janczewskia tasmanica is close to J. Jappacea, which it seems to 

 resemble closely in habit. The differences, so far as may be relied 

 upon at present, are: (1) that of host plant; (2) some difference in 

 details of penetration of host plant and especially the less effect, in 

 /. fasmanica, upon the epidermal cells of the host; (3) that J. tas- 

 ma)iica encircles the host where J. lappacea does not; and (4) possible 

 differences which may be found in the antheridia. On the whole, it 

 seems best to regard J. lappacea, for the present at least, as a distinct 

 but closely related species. 



Janczewskia tasmanica is said by Falkenberji' (1901, p. 257) to be 

 abundant on Laurencia Forsteri in South Australian waters. 



Janczewskia, species imperfecte cognitae 



Besides the six species enumerated above, there are certain species 

 of Janczewskia, as has been mentioned earlier, which are too little 

 known for description or comparison. They are of interest in con- 

 nection with the six species described, as indicating that the genus 

 Janczewskia is likely to be found to be a considerable one. It seems 

 best to enumerate these in this place in order that attention may be 

 called to them in the hope that more material may be obtained and 

 further search made for members of the genus on hosts likely to be 

 infested. 



1. Janczewskia on Cladhymenia oblongifolia 



Schniitz, ('/( Schiiiitz iind Falkenberg, in Engler uiid Prantl, Die natiirl. 



Pfl.-fam., 1 Th.. abth. 2. p. 432, 1897. 

 Falkenberg, Fauna und Flora des Golfes von Neapel, Monogr. 25, p. 257, 



1901. 



The only information published of this species is that given by 

 Schmitz, which is merely a mention of it. and Falkenberg 's statement 

 that it remains unknown to him. 



2. Janczewskia on a species of Lanrencia from South Africa 



FalUonberg, Fauna und Flora des Golfes von Neapel, Monogr. 25. p. 257, 

 1901. 



All lluit is known of this is Falkenberg's .statement that he found 

 a parasite on a species of Laurencia from South Africa which he feels 

 compelled to consider a species of Janczewskia, but whieli was so 

 inideveloped that li(> could not doterniine whether it iiiiiiht be J. vrrru- 

 cacformis or not. 



