1925] Setch< ll-Oardm r: Melanophyceas 461 



gametangia and hairs. Having found in addition to these certain 

 single celled sack-like hairs, he created the new genus based upon this 

 character. Two sizes of these are well illustrated by Kylin (1907, 

 p. 39, fig. 9), found growing on Zostera and Cladophora. These are 

 probably the structures which Foslie (Joe. cil.) refers to as "para- 

 physes. " After having studied these structures as they occur in a 

 variety of species of different genera belonging to the Ectocarpales, 

 our experience leads us to conclude that they are not constant in any 

 species, and that they are probably caused by some pathological con- 

 dition, the nature of which we are not at present able to state. We are 

 taking the view, therefore, that neither of the two genera, Phycocelis 

 Stroemfelt and Ascocyclus Magnus are valid genera, or even subgenera. 

 We have not seen either the type or any other authentic material 

 of the Phycocelis foecunda Stroemfelt, neither have we any authentic 

 measurements of the original material. De-Toni (1895, p. 582) gives 

 35/x to 70fi as the height and 7/x to 12/a as the width of the gametangia. 

 We are listing five forms under the species none of which, so far as we 

 are able to judge, corresponds to the typical material. 



6. Myrionema foecundum f. simplicissimum 8. and G. 



Fronds forming circular cushions 0.5-1.5 mm. diam. ; prostrate 

 portion composed of regularly radiating, closely adhering filaments 

 with apical growth and branching; erect filaments all fructiferous; 

 true hairs unknown ; cells of creeping filaments 3-4.5/* diam., quadrate 

 toward the center, two times as long at the margin ; zoosporangia 

 unknown; "ascocysts" rare to numerous, clavate, 28-34/;. high; game- 

 tangia arising by transformation of all of each erect filament, except 

 near the margin of the frond, 30-40//, high, 7-9//, broad. 



Growing on the sporophylls of Nereocystis Luetkeana. Alaska 

 (Kadiak Island), to central California. 



Setchell and Gardner, Phyc. Cont. II, 1922, p. 336, pi. 33, figs. 

 9, 10. Myrionema strangulans Setchell and Gardner, Alg. N.W. 

 Amer., 1903, p. 249; Myrionema vulgare Collins, Holden and Setchell, 

 Phyc. Bor.-Amer. (Exsicc), no. 924. Phycocelis reptans Tilden, 

 Amer. Alg. (Exsicc), no. 357 (in part). 



The Phycocelis reptans of Tilden, mentioned above, proves not to 

 be uniform, so far as the distribution in the copy at hand is concerned. 

 The material growing on the sporophyll of Nereocystis seems clearly 

 to be M. foecundum f. simplicissimum although young. The material 



