Tropical fern frond. Light micrograph (LM). Transverse section through the frond of a tropical fern. A central vascular bundle (meristele) with central xylem tissue (red) surrounded by phloem (lblue) is visible. A trophophyll frond is a vegetative leaf analogous to the typical green leaves of seed plants that does not produce spores, instead only producing sugars by photosynthesis. A sporophyll frond is a fertile leaf that produces spores borne in sporangia that are usually clustered to form sori. Magnification: x25 when printed at 10 centimetres wide.

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TOP26580532

Source:

達志影像

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RM

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須由TPG 完整授權

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