Gold and Silver Ferns. 13 
midgets — Gymno gramme sulphur ea, for example. 
The gold or silvery appearance responsible for 
the popular names these Ferns bear, is produced 
in various ways. Usually it is due to the secretion 
of a powdery substance that evenly coats the under- 
surface of the fronds. Sometimes, as in the Cheilan- 
tlies (Fig. 9), the silver character is imparted by 
