FIGURE 37.6 A common liverwort. Marchantia FIGURE 37.7 (phylum Hepaticophyta). The Hornworts(phylum Anthocerotophyta) sporophytes are borne within the tissues of He ornwort sporophytes are seen in this he umbrella-shaped structures that arise ohoto. Unlike the sporophytes of other from the surface of the flat, green, creeping bryophytes, most hornwort sporophytes are gametophyte photosynthetic
Non-vascular plants The liverwort gametophyte has a flattened leaf-like structure called a thallus. Liverworts can 地钱的无性生殖 rep e asexually by means of gemma cups that are present on the surface of the thallus The cells, or gemmae, within the cup can be g dislodged by falling drops of water and 胞芽 produce new plants. Liverworts also reproduce sexually with antheridia and rhizoids thallus archegonia, the male and female structures
胞芽 地钱的无性生殖
地钱的生活史 精子 指子体2用 精子器 卵器 胚《子体 b ( 精子器托 器托一8 配于体 子体《♀) 幼孢子体 Q、 配子怀n 孢子 雄配子体n 图1825地钱生活史 图4-6地钱的生活史
地钱的生活史
米 10 图4-5地钱 A.雄株;B.雌株;C.雄器托一部分的纵切面;D.雌器托一部分的纵切面;E.成熟的雌器托的腹面观; F.成熟的雌器托的纵切面;G.颈卵器内的幼子体; H.成熟的孢子体,孢蒴开裂,散发孢子和弹丝;1.弹丝;J孢子;K.,胞芽 雄器托;2.雌器托;3.胞芽杯;4.精子器;5.片;6.颈卵器;7.蒴苞;8.芒线; 9.孢子体;10.孕育着幼孢子体的预卵器腹部;11.假被;12.已开裂的孢萌;13.胞芽的柄
藓的生活史 Figure 33.10 contain ornate 藓纲——葫芦藓 葫芦藓雌雄冋株植物,雌雄生殖器官 分别生在不同枝的顶端 原丝体 孢子体的通常由孢狍子囊(成熟肘称 孢蒴 capsule)、蒴柄和基足组成
藓的生活史 藓纲——葫芦藓 葫芦藓雌雄同株植物，雌雄生殖器官 分别生在不同枝的顶端 孢子体的通常由孢子囊（成熟时称 孢蒴capsule）、蒴柄和基足组成。 原丝体