Reproductive Structures


Pine microsporophyll from a pollen cone (microstrobilis).

Pine microspores.

Pine pollen.

More pine pollen.

Germinating pine pollen.

Developing ovuliferous scale in a young pine seed cone (megastrobilis).

Pine seed cone with ovuliferous scale and developing ovule.

Archegonia from a developing ovule in pine.

Archegonia from pine ovule with egg nucleus.

Lilium anther with four microsporangia.

Lilium microsporangium with cells undergoing the first division of meiosis.

Second division in microsporocytes of a Lilium microsporangium.

Microspore tetrads in Lilium anther.

Microspore tetrads in Lilium anther.

Germinating pollen of Lilium.

Lilium ovary at early stage of development.

Lilium embryo sac development - one-nucleate stage.

Lilium embryo sac development - first division.

Lilium embryo sac development - two nucleate stage.

Lilium embryo sac development - second division.

Lilium embryo sac development - four nucleate stage.