170 
THE SEAWEEDS 
Erythroclonium Muelleri Sonder. 
Stem thick, cylindrical, branched ; branches opposite or whorled, con- 
stricted, ramuli moniliform, the internodes oval or oblong. Height 15 cm. 
South Australia (Investigator Strait, Eastern Bays), Victoria, Tasmania. 
Fig. 41 . — Erythroclonium Muelleri: a , plants; 
b, branchlets; c, one of the 
internodes, with tetraspores; d, 
tetraspores; e, cross-section of 
frond; f , longitudinal section. (After 
Harvey.) 
RHABDONIA Harvey. 
Frond terete, cylindrical, branched on all sides, or moniliform, con- 
stricted into joints, composed of three strata ; the medullary a dense bundle 
of longitudinal filaments; the intermediate a very laxly fibrous stratum; 
the cortical thick, composed of many layers of small, coloured cellules. 
Cystocarps immersed in the branches, enclosed in a network of filaments, 
radiating from a central placenta. Tetrasporangia dispersed through the 
superficial stratum, zonately divided. 
A. — Frond filiform, subcontinuous. 
