The life cycle of Coleochaete used to illustrate the different interpretations of the antithetic theory and the early version of the homologous theory. An asexual thallus (A) produces zoospores that germinate to produce another asexual thallus or a sexual thallus (B). Sexual thalli produce gametes. Zygotes are retained on female thalli and develop into an asexual ‘fruit’ (C) that releases zoospores. Bower (1890) and Scott (1895) agreed that A and B were homologous and that an archegoniate life cycle could be derived by eliminating A (dashed arrow). Bower interpreted C as a new structure interpolated into the life cycle whereas Scott interpreted C as a modified version of A
Celakovsky ( 1874 ) and Bower ( 1890 ) believed generation
C was an antithetic generation intercalated into the life
cycle, whereas Pringsheim ( 1876b ) and Scott ( 1895 ) believed
generation C was merely a reduced version of generation
A (Fig. 1 ).
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