A microgametophyte (PO:0025280) that has as parts one or more antheridia (PO:0025125). [source: POC:curators]
Comment
Microgametophytes in bryophytes only produce sperm cells, but do not develop from microspores, because there is no heterospory in bryophytes. In some pteridophytes, microgametophytes develop from microspores.