Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos
phloem
Introduction References & Edit History Quick Facts & Related Topics
Images & Videos
longitudinal section through xylem and phloem Diagram comparing xylem and phloem cells, showing labeled illustrations of a vessel member, tracheids, and fiber for xylem on the left, and a sieve element, companion cell, sieve plate, sieve areas, and fiber for phloem on the right. A labeled diagram of a typical root cross section shows layers from the outside inward: root hairs, epidermis, cortex, endodermis, pericycle, and a central cylinder containing primary xylem and primary phloem. stem cross section Diagram showing various fern leaf types, including simple, once-divided, falsely dichotomous, and palmate leaves, examples of leaf venation patterns, and cross-sections of petioles illustrating internal vascular arrangements. leaf development
See how sieve tubes and sieve plates stimulate mass flow within a plant's phloem cells
How the vascular system works in plants

phloem: References & Edit History

Article Contributors

Primary Contributors

  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Article thoroughly revised. Feb 03, 2022
Corrected display issue. Feb 11, 2020
Add new Web site: Plants in Action - Phloem structure and function. Oct 24, 2016
Add new Web site: University of Wisconsin-Madison - Plant Teaching Collection - Phloem Tissue. Oct 17, 2016
Add new Web site: Michigan State University - Phloem. Jun 07, 2016
Add new Web site: Washington States University - The Phloem. Jun 07, 2016
Added diagram of a cross section of a root. Aug 19, 2010
Added new Web site: Biology4kids - Xylem and Phloem. Apr 09, 2008
Added new Web site: University of Hawaii - Phloem. Apr 09, 2008
Added new Web site: University of Hamburg - Phloem. Apr 09, 2008
Added new Web site: British Broadcasting Corporation - Plant Transport System. Apr 08, 2008
Article added to new online database. Jul 20, 1998
View Changes:
Article History
Revised:
By: