OF SOUTH AUSTRALIA. 
217 
Fig. 81 . — Martensia denticulata: a, b, and c, different 
varieties; d, portion of the lamina, showing 
the toothed margin, and part of a network; 
e, small portions of a network, bearing 
tetraspores on the longitudinal bars; f, 
tetraspores in situ ; g, surface cells from 
the basal portion of the frond. (After 
Harvey.) 
