1920] Setchell-Gardner: Chlorophyccae 303 



having numerous blunt, mostlj' simple rhizoids arising principally 

 on one side, but oceasionallj' promiscuously scattered all over the 

 sporangia ; zoospores of two sorts, one 3.5/a wide and 5fi long, the other 

 5-6/4 wide and lO-12/i long, development unknown ; aplanospores 

 4/i diam. 



Growing in clam shells. Neah Bay, Washington. 



Setchell and Gardner, Phyc. Cont. I, 1920, p. 298. 



Gomontia polyrhiza Bornet and Flahault, Notes sur deux nouveaux 

 genres d'algues perforaaites, 1888, pp. 161-163 (pp. 3-5, repr.), Sur 

 quelq. pi. viv. dans le test, ealc, 1889, pp. clii-clx, pi. 6-8 (not Codi- 

 olum polyrhiza Lagerheim). 



Bornet and Flahault (1889) distinctly state (p. civ) that the 

 greatest dimensions of the "sporangia'' in their specimens are 120ju, 

 for the height and 75/i for the width and mention that Lagerheim 

 found "sporangia" in his specimens up to 240/a in height and 60jU, 

 in breadtli. We judge, therefore, that the Codiolum-type of "sporan- 

 gium" which Lagerheim figures (1885, pi. 28, figs. 10, 11 in particu- 

 lar) and describes {"pleriimque plus mimts elongatis," loc. cit. p. 22) 

 was not to be found in the French material and certainly is not 

 illustrated by Bornet and Flahault, unless figure 9 on plate 7 may 

 represent it. The type of "sporangium" illustrated by Bornet and 

 Flahault (1889, pi. 7, 8) belongs to the shorter and broader type, the 

 Acarid-type as it may be called, and has blunt, simple or slightly 

 branched rhizoids. Lagerheim (loc. cit., pi. 28, figs. 7, 8, 12, 13) has 

 also figured "sporangia" of the true Acarid-tj^pe and probably found 

 a mixture of species in the shells he examined. Since, however, he 

 emphasizes the elongated, or Codiolum-type of "sporangia," it seems 

 best to reserve his specific name for the species with the Codiolum-type 

 of "sporangium" and assign the new specific name (Bornetii S. and 

 G.) to the species having the Acarid-type of "sporangium" and with 

 blunt, rather stout, simple or, at most, slightly branched rhizoids. 



The filaments of G. Bornetii are well represented by Bornet and 

 Flahault (1889, pi. 6, figs. 1-8) and by their usually large number 

 of short blunt or almost bulbously enlarged branchlets and their com- 

 pact massing, make a characteristic appearance after decalcification. 

 They are very similar to tliose of G. polyrhiza so far as we may deter- 

 mine, but somewhat different from those of G. hahrorhiza, although 

 this difference is not readily described. 



While we find what seems referable to G. Bornetii in the Puget 

 Sound region and that of central California, we desire more abundant 

 and more decisive material to make us certain. 



