Gymnosperms

Megastrobili

female/seed cone

Sporophyll

a leaf that bears sporangia

Microstrobili

male cones

Progymnosperms

extinct seedless vascular plants that may be ancestral to seed plants; has megaphylls, secondary xylem and phloem

Gnetum (Gnetophyta)

trees+climbing vines in tropics

Ephedra (Gnetophyta)

branched shrubs with scale like leaves; separate male and female plants, contains medicinal ephedrine

Welwitchia (Gnetophyta)

only two long leaves in arid regions, separate M+F plants

Microsporocytes

(2n) cell that divides meiotically to produce 4 microspores

pollen grain (gymnosperms)

male gametophyte; contains 2 prothallial cells, 1 generative cell, 1 tube cell

Ovuliferous scale

Scale that bears the ovule in gymnosperm seed cones

Nucellus (megasporangium)

inner part of an ovule, in which the embryo sac develops

Seed-scale complex

two ovules, ovuliferous scale, sterile bract

Integument

covering over micropylar opening/megasporangium

Micropyle

opening in integument wall of ovule

Hypocotyl

region of stem below cotyledons and above root

Gymnosperm Seed

contains sporophyte (2n), megagametophyte (n), seed coat from integument (2n)