Cours sur les pteridophytes pdf

Pteridophyta living in water are known as hydrophyte, sticking in other plants are called epiphyte and living in residue or waste of other plants are known as saprophyte. Examples include ferns, h slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Haeckel 1866 called these groups of plants as pteridophytes because of their pinnate or feather like fronds leaves. Jan 23, 2017 introduction and definition the pteridophytes gk. Les epis sporangiferes portent les megasporanges a leur base et les microsporanges a leur apex. Ferns, horsetails often treated as ferns, and lycophytes clubmosses, spikemosses, and quillworts are all pteridophytes. Apospory in pteridophytes pdf the investigations in pteridophytes probably of most interest and importance ing of apogamy and apospory, it is important to define these terms at the. Pteridophyta is the most highly evolved group among the cryptogams. Pteridophytes introduction, authors and addresses, systematic list, glossary, and key to tribes. This pdf version does not have an isbn or issn and is not therefore effectively published melbourne code, art. Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as cryptogams, meaning that their means of reproduction is hidden. Read the introductory remarks and list of characteristics of the bryophytes p.

Ensuite naitra le sporophyte, lorgane qui portera les spores. Pdf les lichens, bryophytes, pteridophytes et phanerogames. Pteridophytes or pteridophyta, in the broad interpretation of the term, are vascular plants plants with xylem and phloem that reproduce and disperse via spores. Parfois sur les talus des chemins creux et sur les vieux murs ombrages. Les pteridophytes comprennent les fougeres, les preles, les lycopodes et les selaginelles. Les bryophytes vivent le plus souvent en milieu humide. Ce sont des cryptogames vasculaires a lorigine dune lignee evolutive fig. Status of pteridophytes india 500 species of ferns and 100 species of fern allies other than the order of fillicales are on record from india pteridophytic flora of india comprises of 67 families, 191 genera and more than species including 47 endemic indian ferns, and 414 species of pteridophytes 219 at risk, of which 160. Pteridophyte reproduction christian brothers university. In 1880, the cryptogams of the plant kingdom were divided. The pteridophytes are an economically important group of plants. Les pteridophytes sont des cryptogames vasculaires car ils. Sumita, assistant professor, department of botany, pggc11, chandigarh. Des les premiers stades, le developpement des mega et microsporanges sont identiques.

Les pteridophytes sont des plantescryptogames vasculaires sans fleurs comprenant des fougeres, des preles, des lycopodes et des selaginelles. The printed version, however, was effectively published on 6 june 20. Morphologiquement, on a une tige, des feuilles et des racines. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Les pteridophytes sont des plantes vasculaires presentant xyleme et phloeme ne produisant ni fleurs ni graines. Le sporophyte, perche sur le gametophyte, libere les spores qui sont disseminees par le vent. Bulletin mycologique et botanique dauphinesavoie, 2006.

Des lichens incrustants du genre verrucaria forment des taches colorees dans les cours deau rapides. College lycee superieur alternance bac examens metiers jobs, stages. Firstly all the botanists divided the plant kingdom into two large groups cryptogamia and phanerogamia, linnaeus 1754 used the term cryptogams for the first time for those plants which did not possess visible sex organs. Dec 05, 2016 pteridophytes are vascular plants and have leaves known as fronds, roots and sometimes true stems, and tree ferns have full trunks. The different species of selaginella are grown as the garden plants. Quand des conditions viables reviennent, elles font repartir leur metabolisme. Most pteridophytes are terrestrial and grows in moist and shady places while some flourish well in open dry places. Les cellules sexuelles males et femelles sont produites. May 19, 2017 les pteridophytes sont des plantes vasculaires presentant xyleme et phloeme ne produisant ni fleurs ni graines. Les lichens, bryophytes, pteridophytes et phanerogames. Pteridophyta do not produce seeds but they produce spores. Les pteridophytes sont des plantescryptogames vasculaires sans fleurs comprenant.

Le sporophyte est pourvu dun systeme vasculaire les pteridophytes ne. A pteridophyte is a vascular plant with xylem and phloem that disperses spores. Introduction au monde vegetal les champignons les algues. Pteridophyte reproduction liverworts hornworts mosses to be cont. Pteridophytes constitute a significant and important group in the plant kingdom. Like reptiles first true land animals that evolved. Biologie vegetale les pteridophytes botanique youtube.

Les ecosystemes cotiers setendent des estuaires jusqu a lisobathe 20 m. Les lichens, bryophytes, pteridophytes et phanerogames aquatiques. Pteridophytes transition to land megaphylls eusporangiate ferns. Modified 17 199 embryophytes bryophytes rhynia fossil lycopodiophyta pteridophyta transition. Useful notes on the classification of pteridophytes. Ce site vous offre des cours, des livres, des problemes corriges gratuitement pour toutes les filieres universitaires scientifiques francophone. Modified 17 199 embryophytes bryophytes rhynia fossil lycopodiophyta. As they produce neither flowers nor seeds, they are referred to as cryptogams. Il reconnait les formes flechies feminin, pluriel, conjugaison des verbes.