Sporangia can produce asexual spores by mitosis , but in nearly all land plants and many fungi , sporangia are the site of meiosis , and produce genetically unique haploid spores . Sporangia , also known as sporanges ( sing . , sporange ) , can produce spores by mitosis , but in nearly all land plants and many fungi , sporangia are the site of meiosis and produce genetically unique haploid spores .