OF SOUTH AUSTRALIA. 
Fig:. 172. Psilothallia striata: a, plant; b, a small 
branch bearing favellae on its pinnules; 
c, apex of a pinnule, with an involu- 
crated favella; d, the favella, with a 
portion of the involucre removed; e, 
spores; f, a pinnule, bearing marginal 
confervoid filaments, with tetraspores- 
g, one of the fertile filaments; h, 
transverse section of the frond. 
(After Harvey.) 
