CRYPTOGAMIC PLANTS. 89 
In the great family of Fungi, many cases of 
phosphorescence have been accurately observed, 
especially among the Rhizomorphe,—curious vege- 
table organisms, resembling long thin dark-co- 
SDH 
loured roots (rhizo-morpha, m form of a root), some- 
times expanding into a membraniform production, 
which are seen creeping between the bark and the 
wood of old decayed trees (willows, oaks, poplars), 
or shooting down into dark holes, into damp cre- 
vices, etc. 
The white, flocconous extremities which consti- 
tute the myceliwm of the species known as R. sub- 
terranea (fig. 10),observed not unfrequently at the 
