. La botanique pour les étudiants en agriculture . La botanique. Le carpogonium 328 THALLOPHYTES et trichogyne. La cellule pericentral, la grande cellule de l'axe à partir duquel le carpogonium se développe et l'vege--cellules, connues sous le nom de cellules auxiliaires, entourant le carpogo plutonium- participer à la formation de la cystocarp et sont donc considérées comme une partie de l'procarp. Afin de polysiphonia une procarp. Fig. 283, - Polysiiphpnia violacea. A, une partie d'une plante montrant la direction générale- ment et caractère multicellulaire du filament (X 75) ; B, une succursale d'anthéridies de roulement, dont certains se sont détachées (X 400) ; C, branche beari

• Contributeur: The Book Worm / Alamy Banque D'Images
• ID de l’image: RDD80A
• Taille du fichier: 7,1 MB (333,5 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1829 x 1365 px | 31 x 23,1 cm | 12,2 x 9,1 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. Botany for agricultural students . Botany. 328 THALLOPHYTES the carpogonium and trichogyne. The pericentral cell, the large cell of the axis from which the carpogonium arises and the vege- tative cells, known as auxiliary cells, surrounding the carpogo- nium take part in forming the cystocarp and are therefore con- sidered a part of the procarp. So in polysiphonia a procarp. Fig. 283, — Polysiiphpnia violacea. A, a part of a plant showing the branch- ing and multicellular character of the filament (X 75); B, a branch bearing antheridia, some of which have broken away (X 400); C, branch bearing a procarp consisting of carpogonium and adjacent cells at c and trichogyne (() to the tip of which a sperm is attached (X 500); D, branch bearing a mature cystocarp (cy) from which carpospores are shown escaping through an opening in the jacket of the cystocarp (X 75); at the right is a part of a tetrasporic plant bearing three tetrasporangia (X 100). consists of trichogyne, carpogonium, pericentral cell, and auxiliary cells. After fertilization, which is essentially the same as in Nemalion, the carpogonium, pericentral cell, and auxiliary cells unite in forming a large chamber from which lobes arise, and on the ends of these lobes the carpospores are produced. In the meantime vegetative cells, growing up from below, form a jacket which en- closes the spore-bearing structure, thus completing the formation of the cystocarp (meaning a fruit case), which in this plant is a genuine cystocarp. From this cystocarp the carpospores escape and upon germination produce an asexual or tetrasporic plant.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.

Recherche dans la banque de photos par tags

• bookcentury1900
• bookdecade1910
• booksubjectbotany
• bookyear1919