Thallophyta A former division of the plant kingdom containing relatively simple non differentiated plant body, i.e. those with no leaves, stems, or roots. It included the algae, bacteria, fungi, and lichens. The thallophytes are a polyphyletic group of non-mobile organisms traditionally described as "thalloid plants", "relatively simple plants" or "lower plants".
Bryophytes are called amphibians of the plant kingdom because these plants though live in soil but they need water for sexual reproduction. The sperm of bryophyte (antherozoids) are flagellate and need water to swim to the eggs. In other words, as these plants need water for reproduction unlike other plants, they are called as amphibians.
A pteridophyte are a vascular plant (with xylem and phloem) that reproduces via spores, and therefore was a member of the former and now invalid taxon but first true land plants. Pteridophytes are vascular plants and have leaves (known as fronds), roots and sometimes true stems, and tree ferns have full trunks. Examples include ferns, horsetails and club-mosses. Fronds is the largest species of ferns can reach some six metres in length!
Angiosperms are seed-bearing vascular plants The angiosperms are vascular seed plants in which the ovule (egg) is fertilized and develops into a seed in an enclosed hollow ovary. The ovary itself is usually enclosed in a flower, that part of the angiospermous plant that contains the male or female reproductive organs or both.