Pteridophytes

the Pteridophytes include…

horsetails and ferns

xylem and phloem

first terrestrial plants to possess vascular tissues

where are they found

* mostly cool damp shady places
* sandy soil

main plant body

sporophytic

leaves

* microphylls(like in Selaginella)
* macrophylls(like in ferns)

what does the sporophyte produce and what is that attached to

* bears sporangia which is subextenehed to leaf like - appendages called **sporophylls**
* can form strobili or cones(Selaginella, Equisetum)

when spores germinate, what do they create

thalloid gametophytes called prothallus

why are pteridophytes restricted to narrow geographical regions

* gametophytes require cool damp shady places and need water for fertilization

male and female sex organs

* antheridia
* archegonia

what is required for the transfer of antherozoids(male gametes) to archegonium

water

homosporous

* spores of similar kind
* majority of pteridophytes

heterosporous

* different kinds
* macro and micro - Selaginella, Salvinia
* macro(female), micro(male)

development of zygote into embryo in female gametophyte is what

seed habit

classes and their genera

* Psilo**psida**(Psilotum)
* Lyco**psida**(Selaginella, Lycopodium)
* Spheno**psida**(Equistum)
* Ptero**psida**(Dryopteris, Pteris, Adiantum)