Instant Notes: Plant Biology

Q3 – The ferns 287

Rhizome

Sporangia

Fig. 3. A whisk-fern, Psilotum.

(b)

(a)

Sori

Fig. 4. A typical leptosporangiate fern, Phegopteris.(a) Leaf with developing leaf; (b) under-

side of leaflet showing sori.