Seedless Nonvascular Plants

A moss is a simple rootless plant with leaflike growths in a spiral around a stalk. Moss plants are held in place by rootlike filaments or threads made up only a few long cells called rhizoids. One type of liverwort is a simple, rootless plant that has a flattened, leaflike body. Liverworts get their name because, to some people, they look like a liver. The ending, -wort, means “herb,” so the word liverwort means ”herb for the liver.” In liverworts rhizoid is made up of just one cell. Both mosses and liverworts grow in damp areas and range in size from 2 to 5 centimeters in height.

Of approximately 20 000 species of nonvascular plants, most are classified as mo

All plants have a life cycle in which the sporophyte and gametophyte alternate. In other words, all plants go through a diploid and a haploid stage. In nonvascular plants like mosses and liverworts, the sporophytes depend on the gametophytes for water and nutrients. In the more complex vascular plants, like tulips and oak trees, the sporophyte doesn’t depend on the gametophyte for these things.

The largest group of seedless vascular plants is the division Pterophyta, which includes the ferns. There are 12 000 living species of ferns, but like the other divisions of vascular plants, additional species are known only as fossils.

When a volcano erupts, the lava covers the land and destroys the plants living there. After the lava cools, the spores of mosses and liverworts are carried to the new rocks by the wind and begin to grow wherever there is enough water. When they grow on rocks, their rhizoids can actually begin to penetrate tiny cracks in the rocks’ surfaces. Weathering of rocks often begins when mosses release chemicals that begin to break down rocks. Organisms that are the first to grow in new or disturbed areas like these are called pioneer species. Pioneer plant species grow and die and begin to build up decaying plant material that provides nutrients for other less hardy plants. That is, these pioneer plants change the conditions in the environment so that other plants can grow there, too. Eventually, larger vascular plants can begin to grow, sending their roots down through the decaying plants and into the rocks underneath. As the roots grow, they crack the rocks apart even more, and the weathering process slowly turns the rocks into new soil.

Some topics in this essay:
Life Cycle, Horsetails Horsetails, Liverworts Mosses, Nonvascular Plants, Mosses Club, Vascular Plants, Formation Fuel, Plants Seedless, Alternate Generations, Asexual Reproduction, vascular plants, club mosses, mosses liverworts, seedless vascular plants, seedless vascular, vascular tissue, life cycle, nonvascular plants, moss plants, sex cells, plants grow, club mosses spike, mosses spike mosses, simple rootless plant, plants bryophytes ferns,