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MARROW STEM, LIGHT MICROGRAPH
Marrow stem. Light micrograph of a section through the stem of a marrow (Curcurbita sp.), showing the sieve plates in the phloem. A single collateral vascular bundle can be seen. This has an outer and inner phloem (bluish-yellow) with large sieve tubes some of which show sieve plates and companion cells, with an inner xylem (crimson) with large vessels and small woody parenchyma. The cambium (light blue, small cells) is in-between the phloem and xylem. Surrounding the bundle is the ground tissue parenchyma (yellow). Magnification: x37, when printed 10 centimetres wide. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR KEITH WHEELER/SCIENCE PHOTO LIBRARY)
Instruktionen
COPYRIGHTPFLICHTIG
Lizenz
Rights Managed
Erstellungsdatum
20120118
Ort
Credit
KEYSTONE
Source
SCIENCE PHOTO LIBRARY SPL
Byline
DR KEITH WHEELER
Grösse
3540 x 4941 px
Dateityp
JPEG