Thallophyta, in older classification systems, included simple plants like algae and fungi which lack differentiated tissues like roots, stems, and leaves. Tracheophyta is a widely accepted grouping for all plants possessing vascular tissues (xylem and phloem), which include pteridophytes, gymnosperms, and angiosperms. Bryophyta includes mosses, liverworts, and hornworts, not fungi. Pteridophyta includes ferns and horsetails, not mosses or mushrooms.