Each of the four species produced sporophytes at the swollen venter stage when gametangia
were mature and gametes were available for fertilisation events.
Young gametophytes and gametangia
of Acrostichum: A) Bidimensional gametophyte of A.
Fungus colonization always occurs through the rhizoids after male gametangia
Devonian gametophytes with anatomically preserved gametangia
. Science 208: 295-296.
When it is known, the ontogeny of the gametangia
start either with the arquegonia, as in B.
The progenesis and acceleration of gametogenesis in flowering plants resulted in the loss of gametangia
(antheridia and archegonia) on their gametophytes.
The length and width of gametophores, as well as the diameter of the gametangia
were clearly different for both species.
Trichomanes intricatum Farrar and Vittaria appalachiana Farrar & Mickel are perennials that reproduce exclusively by gemmae, even though gametangia
may be present.
are typical of the leptosporangiate ferns, sporophytes after six and a half months in culture did not appeared.
Last, in cultures of the moss Bartramidula bartramiodes it was shown that formation of gametangia
, or organs in which the sex cells are produced, did not occur in medium below pH 5 but did occur with increasing frequency at pH levels up to 7 (Rahbar & Chopra, 1982).
are of the common type for the leptosporangiate advanced ferns.