hydroid

Bryophytes, commonly known as mosses, hornworts, and liverworts, are nonvascular seedless plants that lack specialized tissues for water and food conduction. They are typically small and found worldwide in moist environments.12

Bryophytes exhibit an alternation of generations between a dominant, independent gametophyte and a dependent sporophyte. The gametophyte produces sex organs (antheridia for sperm and archegonia for eggs), while the sporophyte produces spores. Unlike vascular plants, bryophytes usually have a simple vascular system and their gametophyte generation is typically perennial and photosynthetically independent. Structures resembling stems, roots, and leaves are found on the gametophyte. Reproduction can be asexual through fragmentation or specialized cell masses called gemmae.13

Hydroids, in the context of bryophytes, are water-conducting cells found in the central core of some moss stems, analogous to xylem in vascular plants. This is distinct from hydroids in the animal kingdom, which are invertebrates belonging to the class Hydrozoa.245