The phenomena of apogamy and apospory which have now been observed in a number of Ferns, may be mentioned here.
The last-mentioned case has been regarded as representing an apogamous development of the sporophyte from the gametophyte comparable to the cases of apogamy described in Ferns.
This is equally true of the phenomena of apogamy and apospory in the light of recent researches into the effects of external conditions on reproduction.
A number of facts regarding the Algae, and also those relating to such deviations from the normal life cycle as apogamy or apospory, may be regarded as lending support to this view, which, in contrast to the theory of antithetic alternation, has been called that of homologous alternation.
Xlviii.; Farmer and Digby, Studies in Apospory and Apogamy in Ferns, Ann.