1922] Setchell-Gardner: PJiycological Contnhutions 365 



Compsonema coniferum sp. nov. 



Plate 38, figure 3 



Frondibus microscopicis, plus minusve confluentibus, stratum 

 velutinum in superficie hospitis algis alteris minutis immixtis for- 

 mantibus; parte prastrata filamentis profuse ramosis. multo contortis 

 composita; filamentis erectis numerosis. simplicibus, apice basimque 

 leviter attenuatis, non piliferis, 150-200jU, altis; pilis veris deuntibus; 

 cellulis filamentorum repentium forma magnitudineque irregularibus, 

 6-7. 5/A latis, 9-12/i. longis ; cellulis filamentorum erectorum cylindricis 

 usque ad leviter doliiformibus in parte latiore, 8-10^ diam., 1-1.5-plo 

 longioribus ; chromatophoris taeniatis ; zoosporangiis ignotis ; game- 

 tangiis sessilibus aut in pedicellis brevibus e filamentis repentibus 

 oriundis, angusta conicis, 46-65/* longis, 15-18/a latis. 



Growing on the sterile base of Gigartina radula f . Cypress Point, 

 Monterey County, California. Type, Gardner, no. 4684a (Herb. 

 Univ. Calif., no. 207047), December. 



Compsonema coniferum seems to be a very close relative of C 

 fasciculatum, found growing on the same host. The fronds are more 

 extensive, unbranched, and have larger gametangia. We consider this 

 species of Coi7ipsonema a very near approach to an Ectocarpus of 

 extremely small size. We are inclined toward the genus Compsonema 

 as a more appropriate genus for this species than Ectocarpus on 

 account of its extensive creeping habit and prolific production from 

 the creeping filaments of nearly sessile gametangia and many sterile 

 erect filaments. It is to be found quite commonly associated on the 

 same host with several other species of ]\Iyrionemataceae. 



Compsonema dubium sp. nov. 

 Plate 38, figure 6 



Frondibus diminutivibus, flocculos parvos inter algas micro- 

 scopieas alteras in hospite formantibus; parte prostrata filamentis 

 multo contortis, ramosis, repentibus composita ; filamentis erectis 

 simplicibus. totaliter prope exacte cylindricis, 275-350/t longis. non 

 piliferis ; pilis veris deuntibus ; cellulis filamentorum repentium forma 

 magnitudineque maxime variabilibus ; cellulis filamentorum erectorum 

 cylindricis, medio 7-9/t diam., superne inferneque minoribus, 2-3-plo 

 longioribus; zoosporangiis( ?) ellipsoideis, terminalibus, brevi-pedi- 

 cellatis 16-22/it longis, 12-15/x latis ; gametangiis cylindricis usque ad 

 leviter fusiformibus, in pedicellis longioribiLS brevioribusve filamentis 

 repentibus oriundis, terminalibus, raro in filamentis longis erectis 

 terminalibus, 50-75/a longis, 8-11/x latis; loculis plerumque 2-seriatis. 



