OF SOUTH AUSTRALIA. 
333 
Callithamnion Mueller i Sonder. 
Frond dwarf, caespitose, widely branched, intricate, verticillate, densely 
pinnate; pinnae regular, very short, lower ones constricted, rigid, sub- 
acuminate, simple, upper ones curved in, pinnulated, the pinnellae few and 
obtuse. Tetrasporangia secund, on the upper side of the pinnae, trian- 
gularly divided. 
South Coast of Australia (parasitic on Fucoids). 
Fig. 161 .— Callithamnion laricinum : a, plant; b, 
portion of a branch, with dichoto- 
mous ramuli; c, apex of a ramulus 
bearing tetraspores; d, apex bearing 
favellae. (After Harvey.) 
Callithamnion pulchellum Harvey. 
Frond minute, creeping; larger ramuli free at the apices, slightly 
branched, oppositely densely pinnate ; pinnae in pairs, regularly distichous, 
with distichous pinnellae, very simple, thick, subacuminate; articulations 
twice as long as wide ; articulations of the pinnae and pinnellae shorter. 
Cystocarps simple, on the rachis at the apices of the plumules. Tetra- 
sporangia transformed from the pinnellae. 
South Australia (Investigator Strait, Eastern Bays), West Australia. 
