gymnosperm

Its native gymnosperms could evolve into a few species capable of growing in the warm, moist forests of Queensland.

It has enabled gymnosperms and angiosperms to colonize dry terrestrial habitats where lower plants are unable to establish themselves.

Only dicotyledonous flowering woody plants and most gymnosperms have true twigs; monocotyledons and tree ferns do not.

primitive tropical gymnosperms abundant in the Mesozoic, now reduced to a few scattered tropical forms.

Based on this database, we chose the part of gymnosperms and gave a discussion to the features of its chromosomes' evolution and variation.

In gymnosperms , the egg into the neck with only one of the two sperm and egg fusion.

Late Permian a ginkgo, cycads, the cycads, conifers and other gymnosperms , the show began with the appearance of health.

used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales.

an ancestral fossil type from which modern gymnosperms are thought to have derived.

A multicellular, often flask - shaped, egg - producing organ occurring in mosses, ferns, and MOST gymnosperms.

The occurrence of haploid endosperm in the gymnosperms provides a sound basis for further investigations into progenies.

These genes are characterized by several distinct motifs and exist in ferns, gymnosperms , and angiosperms.

Most gymnosperms retain archegonia except for the most advanced genera Gnetum and Welwitschia.

Title An outline of embryological characters of gymnosperms in relation to systematics and phylogeny.

In gymnosperms it gives rise to the body cell and stalk cell.

Different opinions on the origins and evolutions of pteridophytes and gymnosperms.

Archegonium The female sex organ of the mosses, ferns, club mosses, horsetails, most gymnosperms, and some red and brown algae.

integument A layer surrounding the nucellus in the ovules of gymnosperms and angiosperms.

Gymnosperms , the majority still retain the structure neck eggs, eggs in egg-neck in the formation.

Late Triassic, gymnosperms , the mainland has become the real rulers of the main plant.

Carboniferous period, the early gymnosperms (such as etc. ) is very impressive, but the number of ferns most abundant.

Areography of the gymnosperms of China (1): Distribution of the Pinaceae of China.

In the gymnosperms the megaspore gives rise to a cell that is termed the embryo sac because of its similarity to the angiosperm structure.

These results have some significance in understanding the phylogeny of Ginkgo biloba and reproductive evolution of gymnosperms.

Gymnosperms to the development of terrestrial Jisheng period.

cone-bearing gymnosperms dating from the Carboniferous period;

Studies on free radical scavenging activities of extracts from fresh leaves of some Gymnosperms

A floristic analysis on the gymnosperms of Sichuan

Are all seeds of gymnosperms naked