苔藓植物的生活史 2i.spores 配子体占优势的异型世代交替 EIoSIS: 孢子体不能独立生活,只能寄生 在配子体上 FIGURE 21-12 Reproduction in a FERTILIZATION moss. Stages shown in the colored area are haploid (N); those in the white area are diploid (2N). Sperm swim to eggs, formed in organs at the top of female NEW GAMETOPHY TE gametophytes, and form a diploid zygote The zygote develops into a sporophyte, consisting of a stalk bearing a capsule Cells inside the capsule undergo meiosis and form haploid spores, which are shed androids into the air. Germinating spores produce FEMALE GAMETOPHYTE new clumps of gametophytes 配子体与孢子体外形相似,同形世代交替(石莼),否则,为异形世代交替。苔藓植物的生活史 配子体占优势的异型世代交替 孢子体不能独立生活，只能寄生 在配子体上 配子体与孢子体外形相似，同形世代交替（石莼），否则，为异形世代交替