Ferns and mosses Review

Ferns and mosses Review - Ferns1. A sporophyte (diploid)...

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Ferns- 1. A sporophyte (diploid) phase produces haploid spores by meiosis; 2. A spore grows by cell division into a gametophyte, which typically consists of a photosynthetic prothallus 3. The gametophyte produces gametes (often both sperm and eggs on the same prothallus) by mitosis 4. A mobile, flagellate sperm fertilizes an egg that remains attached to the prothallus 5. The fertilized egg is now a diploid zygote and grows by mitosis into a sporophyte (the typical "fern" plant). Moss- The life of a moss starts from a haploid spore, which germinates to produce a protonema, which is either a mass of filaments or thalloid (flat and thallus-like). This is a transitory stage in the life of a moss. From the protonema grows the gametophore ("gamete-bearer") that is differentiated into stems and leaves ('microphylls'). From the tips of stems or branches develop the sex organs of the mosses. The female organs are known as archegonia (sing. archegonium) and are protected by a group of modified leaves known as the perichaetum (plural, perichaeta). The archegonia have necks called
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