1314] Setchell: Parasitic Florideae, I 3 



descriptions of various details of the morphology and physiology of 

 both J. vcrrucacformis and J. tasmanica in his work on the algae. 

 Reinbold (1899, p. 47) mentions a species of Janczewshia under the 

 name "Janczewslin australis? Falk..." found on a host identified as 

 Laiirencia ohtusa at "Investigator Street" (Investigator Strait) in 

 South Australia by Miss Nellie Davey. No exact description is given, 

 but Reinbold says that his plant agrees with the figure of Falkenberg 

 (cf. Schmitz and Falkenberg. 1897. p. 431, fig. 243 C). Evidently 

 J. tasmanica is the species really referred to. De Toni (1903. pp. 811, 

 812) includes Janczewshia with two named species in liis Sijlloge 

 Algarum. These are practically all the references to species of 

 Janczewskia up to the present date, with the exception of a few notices 

 of the occurrence of species of the genus in California. 



The first announcement of the occurrence of JanczeivsTiia in Cali- 

 fornia was made by Charles P. Nott in 1897 (p. 83). He states that 

 he found a species of this genus, supposedly /. rcrrucaeformis Solms, 

 on the shores of IMonterey Bay, growing on Laurencia pinnntifxla 

 Lam'x and also on Rhahrlonia Coulteri Harv. {Agardhiella Coulteri 

 (Harv.) Setchell). Concerning the plant on the latter host, it was 

 sterile, and further study will be necessary properly to refer it 

 generically. It seems certain, however, that it does not belong even 

 to the genus Janczewskia. 



In 1901 a specimen labeled J. verrncaeformis and parasitic on 

 Laurencia piiinatifida was distributed from Fort Ross, California, in 

 the Phycotheca Boreali-Americana (Fasc. 18, no. 887, 1901). In 1903 

 Setchell and Gardner (p. 326) credited J. verrucaeformis to Whidbey 

 Island. Washington, as occurring on Laurencia pinnatifida. In 1905 

 the writer (p. 59) simply mentioned the work of Nott in a short 

 account of "The Parasitic Florideae of California." 



As will be seen below, the species of Janczewskia thus referred to 

 J. verrucaeformis is to be found along the whole Pacific Coast of the 

 United States. Careful examination has shown it to be a distinct and 

 unnamed species. 



III. MATERIALS 



The materials for further study of Janczewskia have been accumu- 

 lating at the University of California since 1896. when Nott made 

 his first collections on Laurencia pinnatifida. The writer has also 

 collected the form on Laurencia pinnatifida several times. It has 



