268 
THE SEAWEEDS 
secund, alternate, multifid, filiform branches, becoming shorter towards the 
apex ; ramuli fibrilliferous, fastigiate. Articulations in branches 4-6 times, 
in ramuli 2-3 times as long as their diameter; bistriate. Cystocarps small, 
ovate, shortly pedicellate. Colour purplish-red or crimson. 
South Australia (Pennington Bay, Kangaroo Island). 
Victoria, Tasmania, New Zealand, Cape Horn. 
Polysiphonia laxa Harvey. 
Harv. FI. Tasm. II., p. 300; Kfitz, Tab. Phyc. XIV., t. 3 ; De Toni Syll. 
Alg. IV., 883. 
Frond to 30 cm. high, slender, setaceous, somewhat rigid. Branching lax, 
the branches distant, zigzag-bent, throwing off branchlets at the angles; 
principal branches several cm. long, variously set with short lateral 
branches, often secund, subsimple, slightly branched, or with a few setaceous 
ramuli ; all the ramification remarkably patent. Articulate, tetrasiphonous, 
ecorticate, median articulations 3-4 times, the upper twice, the ultimate as 
long as broad. Tetrasporangia in sublanceolate ramuli, small, uniseriate. 
Colour reddish. 
Tasmania, on Zosteraf 
Polysiphoma implexa Hooker et Harvey. 
Harv. in Lond. Journ. Bot IV., p. 538; Kfitz. Tab. Phyc XIV. (1864) 
p. 12, t. 36; De Toni Syll. Alg. IV., 889. 
Caespitose, forming wide, lax, intricate patches on rocks about 2.5 cm. 
high. Attached to substratum by adhesive discs. Primary stems decum- 
bent, radical, about 22 d^ thick; secondary branching irregular, articulate;’ 
lower branches dense, upper sparse, attenuate at the base ; ramuli subulate, 
patent, divaricate, articulate, tetrasiphonous ; articulations as long as broad. 
Colour dark ( purple. Adheres to paper. 
Western Australia (epiphytic on Corallines, King George Sound), Lord 
Howe Island, New Zealand. 
Polysiphoma sphacelarioides J. Agardh. 
J. Ag. Till. Alg. Syst. IV. (viii.) p. 100; De Toni Syll. Alg. IV., 890. 
Frond laxly intricate, expanded on all sides, totally ecorticate, capillary, 
elongate, rooting here and there. Branches distant and densely ramellate, 
the ra,chis bare and prominent ; ramelli almost vertical, alternate, sub- 
secund, the young attenuated at the base; older branches soft, articulate, 
tetrasiphonous; articulations 2-3 times as leng as broad, in the ultimate 
ramelli as long as broad. Colour reddish. Adheres to paper. 
South Coast of Australia. 
• 
Polysiphonia} infesians Harvey. 
Harv. Tr. Irish Acad. XVII., p. 539; Kfitz Tab. Phyc. XIV. (1864), 
p. 14, t, 40; De Toni Syll. Alg. IV., 891. 
Fronds 4-8 cm. high, setaceous, attenuated above, pellucidly articulate, 
much branched. Branches patent, often alternate or interspersed with 
vaguely divided ramuli; ramuli capillary, simple, patent, tufted; axils 
