1922] Setchell-Gardner : Phycological Contributions 389 



Streblonema vorax, sp. nov. 



Plate 44, figures 1, 2 



Frondibus microscopicis, filamentis prostratis profuse ramosis, 

 maxime tortuosis, inter cellulas epidermales hospitis penetrantibus, in 

 interiore hospitis diffundentibus et celhilarnm parenchymaticarum 

 parietes dissolventibus, easdem complentibus. et earam partem inter- 

 iorem devorantibus ; cellulis 6-10/* longis, 5-8/x latis ; filamentis erectis 

 400-600/* longis, 6.5-8/* diam., superne in pilis attenuatis, ad aut prope 

 snperficiem hospitis fasciculato-ramosis, massam compactam celhilarum 

 formantibiis ; zoosporangiis late clavatis, 60-100/* longis, 15-30/* latis; 

 gametangiis niimerosis, lateralibus, sessilibus aut pedicellis brevibus 

 suffultis, anguste cylindricis, obtusis, 40-70/* (ad 100/*) longis. 7-9/* 

 latis; loculis plerumque uniseriatis. 



Growing on the outer ends of the leaves of eel-grass, in the lower 

 littoral and upper sublittoral belts. Sitka, Alaska. Type, Gardner, 

 no. 3968& (Herb. Univ. Calif., no. 207003), July. 



Of all the species of Streblonema thus far discovered on our coast, 

 S. vorax is the most destructive to the host. Although the penetrating 

 filaments have abundance of ehromatophores, the plants seem to be in 

 a large degree parasitic. The cells of the host are closely compacted, 

 and have thick walls, yet they are devoured in large quantities. We 

 suggest the possibility of the secretion of enzymes with digestive power 

 which act upon the cell wall and its protoplasm, after which they are 

 absorbed. This plant is found in company with several other small 

 Melanophyceae, Chlorophyceae, and Rhodophyceae, none of which 

 penetrate the host. 



Streblomena scabiosum sp. nov. 

 Plate 44, figure 5 



Frondibus pustulas rotimdas aut ellipticas magnitudine indefinatas 

 in superficie hospitis formantibus; partibus penetrantibus filamentis 

 copiose ramosis primo inter cellulas penetrantibus et eas necantibus, 

 ultimo interiorem cellularum occupantibus et eversionem totam effici- 

 entibus; filamentis erectis supra superficiem hospitis extendentibus, 

 aut simplicibus aut plus minusve basi fasciculato-ramosis. 50-80/* 

 altis; cellulis filamentorum repentium forma magnitudineque maxime 

 irregularibus ; cellulis filamentorum erectorum cylindricis. 4.5-5.5/i 

 diam., 1-2.5-plo longioribus; chromatophoris taeniatis; zoosporangiis 

 ignotis ; gametangiis cylindricis, sessilibus aut brevi-pedicellatis, supra 

 superficiem hospitis extendentibus, 40-60/* longis, 4.5-6/* latis. 



Growing on the stipe of Nereocystis Luetkeana. Cast ashore near 

 the "Cliff House," San Francisco, California. Type, Gardner, no. 

 4628 (Herb. Univ. Calif., no. 207006), August. 



