1920] S&tchell-Gardner : Phycological Ccnitrihutians 299 



Growing in clam shells. Neah Bay, Washington. 



Gomontia polyriiiza Bornet and Flahault, Notes sur deux nouveaux 

 genres d'algues perforantes, 1888, pp. 161-163 (not Codiolum poly- 

 riiiza Lagerheim), 



Bornet and Flahault (1889, p. 9) distinctly state that the greatest 

 dimensions of the "sporangia" in their specimens are 120/x for height 

 and 75/A for width, and mention that Lagerheim found "sporangia" 

 in the specimens up to 240/a in height and 60/i, in breadth. We judge, 

 therefore, that the Codiolum-type of "sporangium" which Lager- 

 heim figures (1885, pi. 28, figs. 10, 11 in particular) and describes 

 {'^plerumque plus minus 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, 

 pis. 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 "spo- 

 rangia" of the Acarid-type and probably found a mixture of species 

 in the shells he examined. Since, however, he emphasizes the elon- 

 gated, 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) 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 compact 

 massing make a characteristic appearance after decalcification. They 

 are very similar to those of G. polyrMza, as far as we can determine, 

 but someAvhat different from those of G. kabrorhiza, 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 before we can determine this. 



Gomontia habrorhiza sp. nov. 



Plate 24, figures 2, 3a, 3b, 3c 



Filamentis repetite et irregulariter ramosis; cellulis forma magni- 

 tudineque maxime variabilibus, typice cylindrieis, 4-7/a diam., 2-8-plo 

 diam. longioribus, chromatophoris pyrenoidibus destitutis, eellulam 

 totam implentibus; "sproangiis" (gametangiis ? aut aplanosporan- 

 giis ?) angustis aut latis, obtuse conicis, 50-70^ altis, 25-60//, latis, in 



