Box.— Vol. I.] SAUNDERS— PHYCOLOGICAL MEMOIRS. 1 55 



20. Ectocarpus confervoides variabilis, form. nov. 



Plate XXIII. 



Plant 2-8 mm. high, sparingly branched, branches alternate, distant, long 

 drawn out at the tip, cells io-30/jt broad, 1-3 times as long as the diameter, 

 not at all constricted ; chromatophores large, band-form, few in each cell ; 

 plurilocular sporangia abundant, lanceolate, fusiform or narrowly ovate, usu- 

 ally on a one- to few-celled stalk, borne laterally on the main stem or branches, 

 occasionally arising by a short stalk from the creeping filaments; 75-90/i 

 X i6-35,a ; unilocular sporangia globose or ovate, 15-35/^ wide, single or 2-15 

 seriate, borne on a one- to three-celled stalk, mostly on the same filament 

 with the plurilocular sporangia but much less common. 



Forming light olive-brown tufts on Laminaria andersonii , 

 Iridcea laminar ioides, Macrocystis ^yrifera, Egregia tnen- 

 ziesii, Nemalio7i inultifidiini, Alaria escidenta, and Lessonia 

 littoralis. 



A very common species and one that varies considerably 

 in the size of the vegetative filament and the plurilocular 

 sporangia. 



21. Ectocarpus penicillatus C. Ag. 



Plate XXI, Figs. 3 and 4. 



Ectocarpus penicillatus C. Ac, Syst. Alg., 1824, 162. 



Plant densely tufted, dark olive-green, 1-4 cm. high; main stem and few 

 of the primary branches corticated ; cells of the primary branches 20-35/x 

 broad, a little shorter than the diameter ; secondary branches somewhat 

 secund, short and very numerous ; plurilocular sporangia linear or linear- 

 lanceolate, sessile pedicillate, acute 85-165/i x 12-20/jt, borne mostly on the 

 secondary branches. 



A dark, olive-green plant forming dense tufts on Desma- 



restia ligulata. Pacific Grove, California. 



22. Ectocarpus tomentosus {Huds.) Lyngb. 



Plate XXIV, Figs, i and 2. 

 Ectocarpus tomentostis (Huds.) Lyngb., Hydrophyt. Dan., 1819, 132. 



Plants forming tufts 1-4 cm. long, of densely interwoven, irregularly, much 

 branched filaments forming a rope-like spungy mass. Filaments 6-8/z wide ; 

 cells 2-4 times as long as the diameter ; branches long, divergent, the ulti- 

 mate ones standing at right angles, curved at the tip ; chromatophores large, 

 irregular, band-form, few; plurilocular sporangia linear-oblong, 40-110/^ x 

 12-18/^, given out at right angles to the filament, sessile or occasionally short- 

 pedicillate, often curved; " ^ sporangia almost elliptical, on short pedicels." 



1 Hauck in Rab. Crypt. Fl. Vol., II, 330. 



