Homospory

Plants whose sporophytes produce only one kind of spore.

Heterospory

Plants whose sporophytes produce two different kind of spores.

Megaspores

Develop into female gametophytes.

Microspores

Develop into male gametophytes.

Gymnosperms

Naked seed plants

(Seeds that are not covered by fruit)

Cycadophyta

(cycads)

Species include Zamia and Cycas

Zamia

Phylum: Cycadophyta

Cycas

Phylum: Cycadophyta

Ginkophyta

The Ginko biloba (maidenhair tree) is the only living species of this phylum.

Ginko biloba

Has deciduous, dichotomous branching leaves. It is a dioecious tree with male trees producing microsporangiate strobili (male cones) and ovulate trees producing large fleshy seeds.

Gnetophyta

Includes the species Ephedra.

Ephedra (inhabits desert regions of U.S)

Coniferophyta

(coniferas)

This group is known for their cones and strobili.

There were fossils of these in lab.

Species include Pinus.

Pinus

Phylum: Coniferophyta

Stroblili 

(Pollen cones)

Male cones of the the phylum coniferophyta. Are composed of microsporophylls.

Microspores

produced in the microsporangia on the surface of the microsporopyhlls.

Pollen Grain

(microgametophyte)

Develops by mitosis. Carried by the wind to female cones where they develop pollen tubes to transport male gametes (sperm)

Megasporophylls

(seed cones, ovulate cones, megasporangiate strobili)

Contains megasporangium (nucellus) which are covered with a layer of integuments.

Megagametophyte

Contains archegonia in which the zygote forms.

Sporophyte Embryo

(of coniferophyta)

The embryo of the sporophyte is contained in a gametophyte contained in the sporophyte tissue of parent.

Generative cell

Eventually gives rise to two male gametes (sperm)