1922] Setchell-Gardner : Phycological Contributions 345 



sparsis; cellulis filamentoruni repentium cylindrieis, 4-5/a diam., 

 2-4-plo longioribus; cellulis filamentorum erectorum 8-9/i, diam., 

 quadratis usque ad 2.5-plo longioribus; cellulis pilorum verorum basim 

 quadratis, superne 5-6/i, diam. et usque ad 20-plo longioribus; zoo- 

 sporangiis( ?) late clavatis, sessilibus aut in pedicellis longioribus aut 

 brevibus suffultis, 50-70/i, longis, 14-18/i, superne latis; gametangiis 

 cylindrieis, plerumque in pedicellis 1-2-cellulis compositis suffultis in 

 filamentis repentibus aut rariore in basi filamentorum erectorum 

 lateralibus. obtusis, 90-1.30/x longis, 9-llfx latis ; loeulis uniseriatis. 



Growing on the outer ends of the blades of eel-grass, in the lower 

 littoral and upper sublittoral belts. Sitka, Alaska. Type. Gardner, 

 no. 3969 (Herb. Univ. Calif., no. 207017), July. 



In this species about one-third of the erect filaments remain sterile, 

 and extend beyond the gametangia. The cells in the creeping filaments 

 are relatively long. The filaments are closely crowded, but distinct and 

 readily separable. All the erect filaments are abruptly narrowed at 

 the base. On account of the long creeping cells, the erect filaments are 

 very much less crowded than is usually the case in most Mtjrionemas. 

 The erect filaments do not arise successively toward the margin of the 

 nearly mature plants. Cells here and there develop an erect filament 

 to the length of several cells before the intervening cells show signs 

 of farther growth. The gametangia are typical of the genus, with 

 uniseriate loculi and with mostly horizontal, cross cell-walls. The 

 zoosporangia( ?) are fairly abundant, and are either with the game- 

 tangia on the same individual or on separate individuals. We question 

 these structures as being functional since none of them has been 

 observed to produce zoospores. They have the appearance of being 

 abortive organs, either zoosporangia or gametangia, more likely the 

 latter, and are probably like the organs observed by ]\Iagnus which 

 induced him to establish the genus Ascocydus. 



Myrioenma setiferum sp. nov. 



Plate 32, figure 8 



Frondibus flocculos aut pulviuulos parvos. densos, irregulares, 

 0.5-0.75 mm. diam. f ormantibus ; parte prostrata filamentis regulariter 

 radiantibus, dense compactis, cellulis -1— 5/x diam., prope margines 

 1.5-3-plo longioribus composita; pilis veris ignotis; filamentis erectis 

 numerosis. simplicibus. apice leviter attenuatis, longe-piliferis, 700- 

 800/i longis; cellulis filamentorum erectorum cylindrieis, 4— 5/x diam., 

 2-3-plo longioribus; zoosporangiis late clavatis, 80-90ja longis, 18-24/x 

 latis; gametangiis cylindrieis. 150-200;Lt longis, 7-8. 5/a latis, sessilibus 

 aut in pedicellis curtis in filamentis erectis aut raro in filamentis 

 repentibus suffultis ; loeulis uniseriatis. 



