302 Fnivcrsitij of California ruhlications in Botany [Vol.8 



1. Gomontia polyrhiza (Lagerh.) B. and F. 

 Plate 19, fiff. 1 



"Sporangia" irrogularl}- and bi'oadly clavate to nearly cylindrical, 

 up to 150/x diam., and 240/i, long, producing usually several blunt, at 

 times sliglitly branched rhizoids at the smaller (proximal) end. 



Growing in clam shells. Neah Bay, Washington. 



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

 forantes, 1888, pp. 161-163, Sur quelq. pi. viv. dans le test, calc, 1889, 

 pp. clii-clx, pi. 6-8 (as to combination onl}') ; Setchell and Gardner, 

 Phyc. Cont. I, 1920, p. 298, pi. 24, fig. 1. Codiolum polyrhizum Lager- 

 heim. Cod. poly. n. sp. etc., 1885 (at least in greater part). 



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

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

 material from which Lagerheim drew his description was apparently 

 in the sporangial stage exclusively, as 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. poly- 

 rhiza of Bornet and Flahault {G. Bornetii S. and G.). 



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

 men distributed by Reinbold from Keil. Reinbold's specimens have 

 "sporangia" largely of the Codiolum-type, both old and young, but 

 it also has an occasional "sporangium" of the Acrid-type (apparently 

 good G. Bomeivi). Since Reinbold'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 Reinbold's specimens are so 

 close to those of G. Bornetii as figured by Bornet and Flahault {loc. 

 cit.) as to be indistinguishable. 



2. Gomontia Bornetii S. and G. 



Horizontal filaments irregular, much branched, erect filaments with 

 clavate ends, less branched ; cells 4-12/x, most frequently Gfi diam., 

 15-55//, long, cylindrical to more or less swollen and crooked; "sporan- 

 gia" variable and irregular in form, 80-125/a wide, 150-200/x long. 



