366 University of California Puhlications in Botany [Vol.7 



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

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

 Univ. Calif., no. 207048), December. 



CompsuHona diihium, like C. coniferum and C. serpens, has close 

 affinities with small members of the genus Ectocarpus. Its relatively 

 long and narrow gametangia distinguish it from the two species here 

 mentioned, with which it is frequently associated. 



Compsonema secundum f. terminale f. nov. 

 Plate 37, figures 4, 5 



Frondibus stratum indefinite expansum, velutinum, per filamenta 

 niaxime distorta. ramosa, repentia, per ramulos radiciformes. numcr- 

 osis, penetrantes. e superficie infera oriondes affixum formantibus; 

 filamentis erectis 700-800)u, (usque ad 1 mm.) longis, simplicibus aut 

 ramulos paucos. breves, secundos, fruetiferos produccntibus. rectis, 

 basim leviter attcnuatis, superne cylindrieis; cclhili.s filamcntorum 

 repentinm et ramuloi-um radiciformium irregular-ibus, maunitudine 

 variabilibus; cellulis filamentorum erectorum cylindrieis, ad dissepi- 

 menta non constrictis a 6-8/x diam., liasi 2-3.5-plo, superne 0.5-2-plo, 

 longioribus; chromatophoris irregulariter taeniatis, in cellula quaque 

 paucis; zoosporangiis( ?) late clavatis, c filamentis repentibus oriundis, 

 50-60/i longis. 18-22^ latis, sessilibus, brevi-pedicellatisve, aut ter- 

 minalibus seriatisque. proliferationibus lateralibus secundisque indutis ; 

 gamctangiis e filamentis repentibu.s oriundis, sessilibus aut longe- 

 ])edicellatis, 90-1.1 0/x longis, 15-1 8/.i latis, proxime cylindrieis aut in 

 filamentis erectis terminalibus, clavatis, frequenter prolongationibus 

 tubereulatis, secundis et magnitudine variabilibus. 



Growing on the pneumatocysts of Nereocystis Luctkeana. Central 

 California (San Francisco and Pacific Grove). Type, Gardner, no. 

 4690 (Herb. Univ. Calif., no. 207049), Pacific Grove, December. 



This form of Compsonema is to be distinguished by the great pre- 

 dominance of relatively short terminal gametangia, and manj^ rela- 

 tively large, lateral, seeund, sessile gametangia which are curved up- 

 wards. There are a few sessile or short pedicellate examples at the 

 base and a few lateral forms on short ramuli. Specimens taken in 

 December had the larger number of gametangia empty. 



