344 University of California Publications in Botany [You 



Myrionema atteniiatum sp. no v. 



Plate 34, figures 6, 7 



Froiidilius strata mioroscopica pins miinisve oonflncntia in snpcr- 

 ficic liospitis formantilnis; ])arte prostrata filamcntis. reo^ulariter 

 radianlibus coniiiosita ; (ilanicntis criM-tis siinplicil)ns supcrne basinuine 

 leviter attenuatis, 180-220/a longis, pilis veris deuntibus; cell.nlis 

 filanientornm repontium 4.5-5.5/i. diam.. proximo qnadratis; ccllnlis 

 filamentornm ereetorum 6-7/a diam., lonj,ntu(lin(' variabilibus; zoo- 

 spoi-anjriis ignotis; gametangiis sparsis, cylindricis usque ad leviter 

 fusiformibus in pedieellis longiorilms aut brevioribus, 30-45/x longis, 

 4.5-6;u, latis. 



Growing on the stipes of Macrocystis pyrifera, Laminaria Farlowii, 

 and on the sterile base of Gigartina radula f. Carmel Bay, Monterey 

 County, California. Type, Gardner, no. 4685a (Herb. Univ. Calif., 

 no. 207029), December. 



It seems that sterilization has proceeded in this species of Myrio- 

 nema until about two-thirds of the erect filaments no longer produce 

 gametangia, and these filaments are several times longer than the 

 gametangia. Tlie cells are slightly doliiform in some collections. 



Myrionema attenuatum f. doliiforme forma nov. 



Plate 34, figures 4, 5 



Frondibus floeeulos parvos, irregulares, inter algas alteras epi- 

 phytieas formantibus; filamentis erectis usque ad 275ia longis ; cellulis 

 filamentorum ereetorum quadratis usque ad 8-plo longioribus quara 

 latis hand dubie doliiformibus ; gametangiis nunc parvis et in fila- 

 mentis longis erectis terminalibus nunc ut in forma species typica. 



Growing on the stipe of Macrocystis pyrifera. Carmel Bay, 

 IMonterey County, California. Type, Gardner, no. 4540a (Herb. 

 Univ. Calif., no. 207026), December. 



The chief distinction between this form and the species, M. attenu- 

 alum, is the decided doliiform character of the erect filaments. Small 

 terminal gametangia appear very frequently on the long, erect fila- 

 ments. 



Myrionema phyllophilum sp. nov. 



Plate 32, figures 1-5 



Frondibus pulvinulos plus minusve orhiculares, 400-800;u, diam. 

 formantibus; parte repente filamentis rectis e centro radiantibus. dense 

 compactis composita ; filamentis erectis simplicibus, cylindricis. basim 

 constrictis, 11()-130/a longis, pro parte superne leviter attenuatis 

 piliferisque; pilis veris inter filamenta gametangia<iue promiscue 



