A fern (small green heart-shaped structure Gametophyte
), produces both male gametes also produce female gametes. The prothalli from a spore formation. After fertilization, the sporophyte formation of a young; by the beginning of root, leaf and stem of primary raw stem and a stem called foot organ. The stem can absorb nutrients from the gametophyte. Some ferns and conifers. microspore
A vegetative prothallus cell equivalent to female gametophyte.
Prothallus brief introduction
Prothallus Chinese name
Prothallus English name
Gametophyte sexual generation. Chloroplast
That can live independently. The ground floor has a archegonium (female genitalia) and antheridia (male genitalia), which can produce a Egg cell
And most of the sperm. sperm
By water swimming to the archegonium, combined with the egg cell. There in the archegonia in zygotic development embryo
And then developed into Sporogonium
. small, mostly live for a short period, no root, stem and leaf differentiation, only rhizoid sperms are produced and the. The archegonium
And complete the fertilization in water conditions. When the fertilized egg develops into the embryo grow, young sporophyte, prothallus gradually withered. The different fern prothallia morphology, size and nutrition are also different. Such as the prothallus psilotales irregular cylindrical, buried in the soil, no body with chloroplast, vascular tissue, fungi and symbiosis; prothalli are oblong, dauciform or disk-shaped lycopsida, growth in the soil part are colorless or yellow to brown, and exposed to the surface of the part is green, there are fungi symbiosis; prothallus. The cushion, with branches erect, green autotrophic; Prothallus ferns are mostly heart-shaped, green autotrophic, also some filamentous or strip.
Prothallus Atlas of entry