A prothallus is
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(i) a structure in pteridophyte formed before
the thallus develops
(ii) a sporophytic free-living structure formed
in pteridophyte
(iii) a gametophytic free-living structure formed
in pteridophytes
(iv) a primitive structure formed after
fertilisation in pteridophyte.
Gametophyte is a free-living, small thalloid structure
called prothallus. In most ferns, the prothallus is green
and autotrophic.