OF SOUTH AUSTRALIA. 
357 
LASIOTHALIA Harvey. 
Frond filiform, branched, articulated, monosiphonous, the stem and 
branches (in many species) at length thickened internally or coated 
externally with decurrent filaments; ramuli always pellucidly articulate 
and monosiphonous. Cystocarps generally in pairs, sessile on the branches, 
naked, containing numerous angular spores. Tetrasporangia naked, sessile 
or pedicellate, distributed on the ramuli, triangularly divided. 
Lasiothalia hirsuta Harvey. 
= Spongoclonium conspicuum Sonder. 
Frond about 20 cm. or more long, wide, caulescent, with the stem from 
the attachment and the ramuli almost entirely stupose, hirsute ; the ramuli 
penicillate, free at the apices, widely branched; ramelli incurved, articula- 
tions longer than wide. Tetrasporangia sparsely carried on the sides of 
the ramelli. 
South Coast of Australia, Tasmania. 
Lasiothalia (?) plumig.era (Harv.) De Toni. 
= Callithamnion plumigerum Harvey. 
Frond spongy, three or four times pinnate, the pinnae and pinnules 
covered with interwoven, articulated filaments, and hairy with minute, 
forked ramelli; ultimate ramuli free, alternately plumulate; plumules 
minute, pinnato-multifid. Favellae in pairs, sessile. Tetrasporangia 
globose, secund on the divisions of the plumules. 
Attachment covered with woolly fibres. Frond three or four times pinnated, 
of a soft spongy texture, the primary, secondary, and tertiary pinnae 
externally clothed with minute, horizontal, subsimple, jointed hairs or 
ramelli. These hairs spring from numerous longitudinal interwoven fila- 
ments, enclosing as in a sheath the proper or primary filamentous frond, 
which runs as a jointed axis through every portion of the spongy branches. 
The primary filament has the structure of an ordinary C alldthamnion ; its 
naked tips are set with alternate, secundly multifid plumules, not more than 
4 mm. to 6 mm. long. Favellae are hidden among the superficial hairs, 
which cluster round them as involucres; they are in pairs and contain 
many spores. Tetraspores secund along the inner face of the division of 
the plumules. Colour red to purple. Substance flaccid. Adheres to paper. 
Victoria (Port Fairy, Western Port). 
Lasiothalia (?) formosa (Harv.) De Toni. 
= Callithamnion formosum Harvey. 
Attachment a small callous disc. Frond 25 cm. to 50 cm. long, situpose, 
hirsute, distichous, alternately branched ; ramuli above free, pinnate, 
irregular; the pinnae spreading in all directions, sublanceolate, the pin- 
nellae alternate on the elongated rachis, which is prominent and glabrous; 
erect, patent, almost all pinnulated. Tetrasporangia subsolitary, regular 
on the pinnellae, sessile. Colour light rosy -brown; substance soft, but not 
gelatinous; adheres to paper. 
South Australia (Investigator Strait), Victoria (Port Phillip). 
