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`NONVASCULAR PLANTS: MOSSES, LIVERWORTS, AND HORNWORTS (CONCEPTS (VASCULAR…

- - - - in some mosses the innermost cortex is composed of cells called hydroids that conduct water and dissolve minerals. species that have hydroids also have leptoids cells that resemble sieve cells.
    - - growth of the gametophore begins when a spore germinates and sends out a long slender chlorophyllous cell. this cell undergoes mitosis and produce protonema.
    - - the leafy stem, technically known as gametophores, of many moss plants grow close together, tightly appressed and forming dense mounds. moss gametophores grow from an apical meristem that contains a prominent apical cell.lack cuticle. lack stomata. stems are slender and have littke tissue differentiation .
    - - the gametophore at some point produces gametangia. all mosses are oogamous that is every species have small biflagellated sperm cells and large nonmotile egg cells. sperms are produced in microgametangia called ntheridia and egg occurs in megagametangia called archegonia.