It is by no means so improbable, however, that further research may show cases where the egg-cell of a lower cryptogam-e.
"Disease in Plants"
H. Marshall Ward
The inhabitants of the poplar have disappeared, perhaps long ago, as is proved by the mycelium of the agaric; the insect would not gnaw and bore its way through timber all permeated with the felt-like growth of the cryptogam.
"The Glow-Worm and Other Beetles"
Jean Henri Fabre
The characters of the cryptogam and Phanerogam are so mixed up in it that, although the special lines of development are difficult to trace, it is one massive testimony to the evolution of the higher from the lower.
"The Story of Evolution"
Joseph McCabe