OF SOUTH AUSTRALIA. 
103 
Punctaria latifolia Greville. 
Fronds from a minute disc, often caespitose, up to 30 cm. high, to 7.5 
cm. wide, lanceolate or oblong, membranaceous and semi-pellucid, green or 
olivaceous. Sori in spots. 
South Australia and Victoria. World-wide. 
SCYTOSIPHON C. Agardh. 
Frond cylindrical, simple, unbranched, tubular, of two strata, of interior 
cylindrical and exterior rounded-angular cells. Plurilocular sporangia 
occupying now a continuous area, now forming spots, cylindrical of one 
row of locelli), 
Scytosiphon lomentarius (Lyngb.) J. Agardh. 
Frond intestiniform, sometimes articulately constricted (i.e., with swollen 
interstices), 15 to 25 cm. or more long, narrow, 1 to 4 mm. wide. Pale 
brown. Sporangia accompanied by paraphyses. 
World-wide in distribution. Around the coast of Australia from at least 
Fremantle to Sydney. 
COLPOMENIA Derbes and Solander. 
Frond saclike, hollow, the walls of the sac composed of two strata, the 
inner of a few layers of larger rounded cells, the outer of a single layer of 
minute angular cells. Plurilocular sporangia forming small sori dotted 
over the surface, cylindrical-prismatic, accompanied by one-celled para- 
physes. Unilocular not observed. 
Colpomenia sinuosct (Roth) Derbes and Solander. 
Pale-brown bladders growing without stipes by a broad attachment to 
rocks near low water. They may reach the size of a man’s head, and 
attached to young oysters may lift them and float away to distant quarters, 
so as at times to be a serious pest to oyster culture. 
In all seas except the coldest. 
HYDROCLATHRUS Bory. 
Frond as in Colpomenia, not continuous but forming an open meshwork. 
Plurilocular sporangia not in sori but scattered over the whole frond. 
Hydroclathrus cancellatus Bory. 
Dark-brown nets, stipitate below, widely expanded, to 15 cm. in 
diameter. # 
It prefers warmer seas but occurs in South Australia and Victoria, 
though not in Tasmania. Common in the tropics. 
