298 University of California Puhlicxitions in Botany 1^'"^. 7 



Gomontia polyrhiza (Lagerh.) B. and F. 

 Plate 24, figure 1 



"Sporangia" irregularly and broadly clavate to nearly cylindrical, 

 up to 150/A diain., and 240/x long, producing usually several blunt, at 

 times sliglitly l)i;iii('licd, rhizoids at the smaller end. 



Growing in clam shells. Neah Bay, Washington. 



Bornet and Flahault, Note sur deux nouveaux genres d'algues 

 perforantes, 1888, pp. 161-163 (as to combination only). Codiolum 

 polyrkizum n. sp. Lagerheim (at least in greater part). 



The above description is taken in part from the original of Lager- 

 heim and in jiart from the material collected at Neah Bay. The 

 material from which Lagerheim drew his description was apparently 

 in the sporangial stage exclusively, at least he did not recognize a 

 sterile or vegetative stage. The Neah Bay material, collected in May, 

 is likewise in a reproductive stage, or if the vegetative stage is present 

 it and the sporangial stage could not be identified as belonging to the 

 same species, hence the incompleteness of the description. 



The sporangia approximate so closely to the figures (especially 

 figs. 10, 11) and the description of Lagerheim as to make it sufficiently 

 safe to ally our plant with his and to keep it distinct from the G. 

 polyrhiza of Bornet and Flahault (G. Bornetii S. and G.). 



The filaments of this species have been examined by us in a 

 specimen distributed by Reinbold from Kiel. Beinbold's specimens 

 have "sporangia" largely of the Codiohim-type, both old and young, 

 but is also has an occasional "sporangium" of the Acarid-type 

 (apparently good G. Bornetii). Since Beinbold's locality is not far 

 distant from Lagerheim 's type locality, it seems extremely probable 

 that his plant is true G. polyrhiza. The filaments in Beinbold's speci- 

 mens are so close to those of G. Bornetii as figured by Bornet and 

 Flahault {loc. cit.) as to be indistinguishable. 



Gomontia Bornetii nom. nov. 



Horizontal filaments irregular, much branched, erect filaments with 

 clavate ends, less bi-anched ; cells 4-12fi, most frequently 6/x diam., 

 15-5;V long, cylindrical to more or less swollen and crooked : 

 "sporangia" variable and irregular in form, 8-125/i, wide, 150-200/x 

 long, having numerous, mostly simple rhizoids arising principally on 

 one side ])ut occasionally ])romiscuously scattered all over tlie spo- 

 rangia ; zoospores of two sorts, one 3.5/t wide and 5/i. long, the other 

 5-6|u, wide and 10-1 2/i, long, development unknown; aplanospores 4fi 

 diam. 



