Fern development at the example of a dot fern Photos to increase click Frond of a dot fern Prothallus dies and a young fern grows up. Above 1. Generation: Fern fronds, you can see in the forests. Each dot at the frond underside contains a group of spore cases (sori) Antherozooids free swimming and one fertilizes archegonium. Sporangium shedding spores Under surface of a prothallus. Archegonia above, antheridia below at the prothallus. Left 2. Generation: Prothallus, looks like a leef 0,5 to 1cm in diameter. Spores Spores develop into a prothallus The 2 gernerations of fern plants

Different fern species have differnt sori Photos to increase click
Polipodium sori are roundish and lack indusia	Spores in cover in the form of pea with Psilotum nudum	Polystichum setiferum, sporangia covered with roundish indusium	Hairy indusia with Microgramma	Blechnum cordatum, sporangium under rolled up border	Pilularia sporecases like a little hairy pill

Explanation of the used terms
group of spore cases	sori
spore cases	sporangia
prothallus	gametophyte
genital organs	gametangia
feminine sex organ	archegonia
male sex organ	antheridia
familiar fern plant	sporophyt