OF SOUTH AUSTRALIA. 
31 
attachment, its macroscopic cells and its watery content, it is more 
naturally placed in the Yaloniaceae with Struvea , Dictyosphaeria, Micro - 
dictyon, and Valonia. 
DICTYOSPHAERIA Decaisne. 
Frond composed of decumbent green segments spreading outwards from 
a broad attachment, and consisting of a thick membrane made up of one 
or more layers of subglobose vesicular cells in a close network and con- 
taining green fluid endochrome. 
Fig. 13 . — Dictyosphaeria sericea ; 13a, cell. Fig. 14 . — Dictyosphaeria fawulosa; 
14a, portion of frond; 14b, bordering cells with Haptera. (Partly 
after G. Murray.) 
Dictyosphaeria sericea Harvey. 
Attached to the roughnesses of the rocks by a broad irregularly-shaped 
membranous base of several layers, and difficult to remove without rupture. 
From the edges of the base grow out flat, firm, green semi-circular or semi- 
elliptical membranous fronds, an inch or two in diameter. These are free 
but decumbent, often incurved near the free entire borders. They may 
