338 Vniversiti) of California Puhlications in Botany ["^^o^' 



Myrionema foecundum f. divergens forma iiov. 



Plate 34, figures 8, 9 



Froiulibus pulvinulos orbiculares, 1.5-3.5 mm. diam. formantibns; 

 parte ha.sali filaiiK'iitis dense eompactis. eoiijnnctim et ad siipcrficiem 

 hospitis aivte adhaereiile ; filamentis sterilibus ereetis exij;iis, cramosis, 

 obtusis, promisqne inter gametangiis sparsis, 300-400/x, longis; pilis 

 veris denntibus; "ascocystis" niimerosis, inter, et brevioribns qnam, 

 prametancfiis. sparsis. cylindrieis nsqiie ad elavatis; eollnlis filamen- 

 tornm repentium 5-Gja diam., 1.5-2-plo longioril)us; ccllulis filamcn- 

 torum erectorum 8-9/x diam.. 1.5-3-plo longioribus, cylindrieis, non 

 constrietis. zoosporangiis ignotis; gametangiis forma varialiilibus, 

 cylindrieis. eylindro-eonicis usque ad fnsiformibiis, 50-60/x longis. 

 7.5-8.5;u, latis; loculis 1-2-seriatis. 



Growing on the sporophylls of Nereocystis Luetkeana. Pacific 

 Grove. California. Type, Gardner, no. 4511 (Herb. T^niv. Calif., no. 

 207024), December. 



This form of 3/. foecundum manifests some slight differentiations 

 not present in any other form of the species. Scattered promiscuously 

 over the frond are erect filaments two to three times as long as the 

 gametaugia. The "ascoeysts" are abundant. Some irregularities are 

 also shown in the creeping filaments. Typically the branching seems 

 to take place by the splitting of the apical cell, but it seems that 

 frequently one of the dichotomy fails to develop till later, producing 

 the appearance of lateral branching. There is also an occasional 

 oblique or longitudinal division of a cell of the creeping filaments 

 perpendicular to the host. 



M5nnonema foecundum f. majus forma nov. 



Plate 32, figure 7 



Frondibus pulvinulos orbiculares, 1-2 mm. diam.. superficie super- 

 iore convexa ; parte prostrata filamentis arete adhaerantibus. regu- 

 lariter radiantibus composita : filamentis ereetis dense stipatis, sim- 

 plicibus, cellulis cylindrieis, 5-7ju, diam. ; pilis veris sparsis, per f rondem 

 promiscue distributis, basim meristematicis, vaginatis, 400-500// longis, 

 cellulis 6// diam. apice, 5-8-plo longioribus; "ascocystis" in filamentis 

 prostratis ses.silibus, cylindrieis, apice leviter distentis, 45-55/i, longis, 

 8-12yLt latis, nunc in fronde tota sparsis nunc in gregibus isolatis; 

 znosporangiis ignotis; gametangiis m filamentis basalibus se.ssilibus, 

 cylindrieis, 60-80ju, longis, 6-8/i, latis, per transformationem quisque toti 

 filamenti oriendis, dissepimentis horizontalibus aut obliquis. 



Growing on Laminaria ephemera Setchell. Port Renfrew, Van- 

 couver Island, Neah Bay, Puget Sound (Tacoma) and central Cali- 

 fornia (Carmel Bay). Type, Gardner, no. 2910 (Herb. Univ. Calif., 

 no. 207013^. Carmel Bay, California, May. 



