194 GOLDFISH VARIETIES AND 
no reason why it should not be better known. As will be noted in Figure 
147 it propagates from runners, but the seeds also germinate under 
favorable conditions. The plant is of European introduction. 
TRIANEA 
Trianea bogotensis is an attractive, small floating plant with thick, 
heart-shaped leaves. It needs a moist warm atmosphere and not too 
much direct sun. Under these conditions it thrives and is a valued 
feature in the summer pool or greenhouse tank. It is not found locally 
in temperate climate but may be had of dealers. 
WATER FERN 
Not looking particularly fern-like, the Water Fern, Ceratopteris 
thalictroides, is the only truly aquatic species of the fern family. It is 
of comparatively recent introduction into the aquarium and indoor pool, 
Fic. 148. Water Fern (Reduced) 
it being more suited to the latter. In a partially shaded position in the 
greenhouse it grows into floating masses a foot or more in diameter, 
piling up to some height on account of its peculiar means of reproduction, 
