206 
THE SEAWEEDS 
densely intricate so that they can scarcely be 
separated without tearing. The younger 
branches show the constrictions and dia- 
phragms, in the older these are obscured. 
Colour purple C. parvula (A g.) 
J. Agardh. 
South Australia (Eastern Bays). 
Fig. 70 .— Champia parvula : a, sturdy form of the cysto- 
carpic plant, showing habit of part of one 
main branch; b, habit of small portion of a 
more slender form; c, surface view of portion 
of a tetrasporangial branch, with several 
subcortical tetrasporangia and two branch 
rudiments. (After Taylor.) 
2. Frond 15 cm. to 30 cm. long, 1 mm. to 2 mm. 
diameter, paniculately branching; branches 
opposite, alternate or whorled. Constrictions 
and diaphragms conspicuous. Terminal 
branches often hooked. Colour flesh-purple . C. affinis 
(II. & H.) J. Agardh. 
South Australia (Investigator Strait, Eastern Bays). 
3. Frond like that of affinis but the constrictions 
and diaphragms completely masked. Pro- 
bably only a form of affiinis C. obsoleta 
Harvey. 
South Australia (Eastern Bays). 
B. — Fronds obviously compressed. 
1. Dwarf , 2 cm. to 5 cm. high, 3 mm. to 4 mm. 
wide, almost flat, growing in small clumps, 
mostly bi-pinnate in branching, the branches 
tapering at both ends. Dissepiments 
prominent. Colour a reddish-purple, the 
plants showing a blue fluorescence when grow- 
ing. A shallow water form C. compressa. 
Harvey. 
South Africa, New Caledonia, Ceylon, Australia (?). 
