The microgametophyte in gymnosperms is the four-celled, "winged" pollen grain. Within the pollen grain, you can distinguish the generative cell and the tube cell nucleus. The two prothallial cells are not apparent under the microscope. On either side of the pollen grain, two ear-like structures emerge.

Members of the Phylum Coniferophyta (Gymnosperms) in Kingdom Plantae are said to have been the first vascular plants to produce seeds. The majority of the species are woody plants (a few species are shrubs) commonly found in the northern hemisphere (especially in cool temperate and boreal areas such as the Taiga forest).

Scientifically, they make up the division Pinophyta (/ p ɪ ˈ n ɒ f ɪ t ə, ˈ p aɪ n oʊ f aɪ t ə /), also known as Coniferophyta (/ ˌ k ɒ n ɪ f ə ˈ r ɒ f ɪ t ə,-oʊ f aɪ t ə /) or Coniferae. The division contains a single extant class, Pinopsida. All extant conifers are perennial woody plants with secondary growth. [a] The ...

The two prothallial cells are not apparent under the microscope. On either side of the pollen grain, two ear-like structures emerge. Thes air sacs may help orient the pollen grain toward the ovule.

Conifers. Go to pine life cycle review . Return . Seed plants all of which produce woody stems. Like the Cycads and Ginkgoes are well represented in the fossil record with members dating from the upper Carboniferous.