04/17/2012
Fern prothallium
older sporophyte
Fern prothallium
antheridium and archegonia
Psilotum:
aerial stem
Pteridium rhizome
Cyrtomium falcatum:
sorus on leaf median
Fern prothallium
older sporophyte
Fern prothallium
antherida & archegonia
Pteris: rhizome
cross section
Psilotum: aerial stem
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