HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Sporangia
Close-up of Polypody sori Ferns in this family produce spores in spore cases (sporangia) which are clustered in fruitdots or "sori" on the under-surfaces of the fertile fronds. All the spores are of one type (homosporous). A germinating spore grows into a small heart-shaped prothallus and male and female sex organs develop on its underside. Sperm cells swim in the soil moisture to the female organs and new fern plants grow up from the fertilised egg cells. [CH] {FG}
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