362 University of California Publications in Botany [^^«i- " 



Growinj; on tlic i)n('uinatocyst of Nereocystis Luetkeana. West 

 coast of Wasliin}?toii (Moclips) to central California (Carmel Bay). 

 Type. Gardner, no. 4547 (Herb. Univ. Calif., no. 207044), Carmel Bay, 

 California, December. 



Like Compsonema ramulosum, C. secundum has gametangia occupy- 

 ing a variety of positions and assuming a diversity of forms. The 

 form of gamentangiiim which marks the species is the long terminal 

 form which develops numerous, short, blunt-conical, seriate, secund, 

 sessile gametangia, thus forming a complex composed of these game- 

 tangia and the metamorphosed cells in the upper part of tlic filament. 

 The end of the filament becomes reflexed. at times almost scorpioid. 

 The specimen from ]\foclips, Washington, was taken in IMay and tlie 

 gametangia were practicality all empty. The other parts of tlio plants 

 manifested signs of old age conditions. They seem to belong to this 

 species, but the filaments have a considerably greater diameter. Typical 

 zoosporangia with well formed zoospores have been observed in tliis 

 collection. 



Compsonema ramulosum s]i. nov. 



Plate 39, figures 1-5 



Frondibus pulvinulus orbicnlares, 5-7 mm. diam. formantilms; 

 parte prostrata monostromatiea, filamentis plus minusve contortis et 

 irregulariter ramosis, radiantibus composita ; filamentis erectis pro 

 parte piliferis simplicibus aut ramos breves plerumque fructiferos, 

 secundos et interdnin ])ilos ferentibus, basim leviter attenuatis; ccllnlis 

 filamentorum rejK'nliuni 6-7/a diam., (juadratis aut leviter longioribus 

 quam latis; cellulis filamentorum erectorum basim 6-7. 5/a diam., 

 superne leviter latioribus, 1-3.5-plo longioribus ; cellulis ramorum 

 pilornmque 4-6/x diam.; chromatophoris taeniatis. plus minusve inter- 

 rui)tis angnhiribusque; zoosporangiis( ?) late clavatis, terminalibus 

 pedicellis longioribus bervioribusve suffultis aut prope apices fila- 

 mentorum erectorum lateralibus, secundis aut verticillatis; gametangiis 

 forma, magnitudine et positione maxime variabilibus, in filamentis 

 repentibus sessilibus ])edicellatisve, in filamentis erectis lateralibus. aut 

 in filamentis primariis aut in ramulis lateralibus brevibus intercalar- 

 ibus terminalibusve. clavatis, cylindricis, usque ad cylindrico-conicis, 

 usque ad 14()/i. longis, 16/^ latis; loculis pl(>runuiue 2-seriatis. 



Growing on the pneumatocysts of Nereocystis Luetkeana. Carmel 

 Bay, Monterey County, California. Type, Gardner, no. 4549 (Herb. 

 Univ. Calif., no. 207045), December. 



There exists in this species extreme variation in tlu> form, size, and 

 position of the gametangia. Some are sessile on the creeping filaments, 

 though they are more frequently to be found on the pedicels up to 



