1922] SetcJiell-Gardner : Phycological Contributions 361 



Compsonema myrionematoides sp. nov. 



Plate 36, figure 1 



Frondibus pulvinulos parvos, orbiculares usque ad irregulares, 

 1-2.5 mm. diam. f ormantibus ; parte prostrata arete monostromatica, 

 filamentis dense compactis, tortuosis, radiantibis composita ; filamentis 

 erectis simplieibus. eylindricis, 110-130/x longis; pilis veris deuntibus; 

 eellulis filameiitorum repentium forma eylindricis usque ad irregular- 

 ibus; eellulis erectorum eylindricis, 7.5-8.5/* diam., 1-2-plo longioribus, 

 terminalibis plerumque plurimo longioribus ; chromatophoris leviter 

 interrupto-taeniatis, in quaque cellula singulis; zoosporangiis( ?) late 

 clavatis sessilibus aut brevi-pedicellatis e eellulis filamentorum repen- 

 tium oriundis, 35-50/a longis, 20-28/* latis ; gametangiis numerosis, 

 eylindricis usque ad fnsiformibus sessilibus aut brevi-pedicellatis e 

 eellulis filamentorum repentium orundis, 50-70/t (usque ad 100/t) 

 longis, 9-12/t latis. 



Growing on the stipe of Nereocystis Luetkeana. Pacific Grove, 

 California. Type, Gardner, no. 4510 (Herb. Univ. Calif., no. 207043), 

 December. 



There is but little choice as to the generic position of this small 

 alga. It forms small brown tufts or cushions of loose filaments. Very 

 frequently the gametangia are wider in the middle than at the ends and 

 have decidedly biseriate loculi. Because of the more or less loose tufted 

 character of the erect filaments and the partially biseriate gametangia 

 we are placing it with the genus Compsonema. 



Compsonema secundum sp. nov. 



Plate 37, figures 1, 2 



Frondibus parvissinus, plerumque plus minusve eonfluentibus ; 

 parte prostrata monostromatica, filamentis crispatissimis, ramosis com- 

 posita; eellulis filamentorum repentium forma irregularibus, 7-8,/i 

 diam., longitudine variabilibus; filamentis erectis usque ad 1.25 mm. 

 altis, simplieibus aut raro ramulis paucis brevibus fructiferis in- 

 structis; eellulis filamentorum erectorum eylindricis, basim 5. 5-6. 5/* 

 diam., 4.5-6-plo. longioribus. in parte latissima 9.5-10.5/x diam., eellulis 

 terminalibus usque ad 9-plo longioribus quam latis; chromatophoris 

 taeniatis; zoosporangiis late clavatis, 60-90/t longis, 22-28/t latis. 

 sessilibus aut brevi-pedicellatis e eellulis filamentorum repentium 

 oriundis; gametangiis maxime variabilibus, raro pedicellis brevibus e 

 filamentis repentibus oriundis sufi'ultis, interdum per transformatione 

 partis superioris filament! erecti longi extensis, nunc .simplieibus, nunc 

 prolifieationes numerosas laterales, breves plerumque secundas, raro 

 oppositas producentibus, usque ad 400/*. longis, ll-15/i latis, obtusis, 

 clavatis. 



