OF SOUTH AUSTRALIA. 
91 
Dictyota dichotoma (Huds.) Lamouroux. 
Frond scarcely stupose at the base, dichotomous, spreading, apices forked. 
Spores scattered over the disk of the frond, leaving a clear border on the 
margin. Surface smooth without pro] ideations. 
World-wide. 
Fig. 51. — Branch, of Dictyota dichotoma. 
Dictyota ocellata J. Agardh. 
Stipes stupose, frond dichotomous, rather thick and firm, segments 
linear. Spores scattered over the frond. 
Investigator Strait. 
Dictyota radicans Harvey. 
Attached by many long simple thread-like fibres, proceeding partly from 
the base of the frond, and partly from the lower parts of the principal 
rachides, the fibres as thick as hogs’ bristles and from 2.5 to 7.5 cm. long. 
Frond irregularly dichotomous with blunt axils and tips, markedly fenes- 
trate. Sori of spores linear, longitudinal. 
Western Australia, South Australia (Encounter Bay), Tropical Austra- 
lia and Tongatabu. 
