266 
THE SEAWEEDS 
above. Branches erecto-patent, elongate, densely branched, with simple 
furcate, sparse and irregular ramuli. Secondary and tertiary branches 
dichotomous, lateral branches subfastigiate. Articulations as long or slightly 
longer than broad. Tetrasporangia borne in ecorticate ramelli, which are 
often furcate. Colour brown. Adheres to paper. 
Only recorded from Investigator Strait, South Australia. 
Polysiphonia crassiuscula Harvey. 
Harv. FI. Tasm. II., p. 299; De Toni Syll. Alg. IV., 885. 
Fronds 10 cm. to 15 cm. high, not densely tufted, repeatedly dichotomous 
from the base, the lower axils very patent; cartilaginous, thickly coated 
with secondary .cells in the lower part, softer and more pellucid above, at 
Fig. 121 .^—Polysiphonia Mallardiae. Fig. 122 . — Polysiphonia frutex. 
the ends of the branches flaccid, much attentuated and pellucid. Articula- 
tions short in all parts of the frond, only equalling their diameter towards 
the end of the young branches, tetrasiphonous ; lower articulations more or 
less obliterated, being covered externally with several rows of accessory cells. 
Tetraspores borne towards the apex of branched ramuli in dense fasciculate 
clusters; ramuli slightly swollen in region of tetraspores. Colour a dingy 
reddish-brown when dry. Substance rigid, the tips only adhering to paper. 
South Australia (Eastern Bays), East Coast of Tasmania. 
% 
Polysiphonia dasyoides Zanardini. 
Zanard. Phyc. Aus. Nov. (1874), p. 489, n. 10; De Toni Syll. Alg. 
IV., 954. 
Frond corticate to the apices, pinnately branching, branches spreading 
to all sides. Clothed with simple, furcate, dense, four siphoned ramuli, 
apices ocellate. Primary articulations all obsolete ; in the ramuli the 
diameter twice the length. Colour red. Sustance soft, succulent. 
Georgetown, Tasmania. 
