Identify the pair of feaures common to both Gymnosperms and Bryophytes

Both Bryophytes and Gymnosperms have archegonia and embryo. Bryophytes have independent gametophytes and dependent sporophyte which is opposite feature to gymnospems. Biflagellate male gametes are seen only in Bryophytes and in Gymnosperms the male gametes are usually non flagellate.