Endophyte

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1. A plant living within another plant. In turfgrasses, it is a fungus (fungi) within the grass plant secreting substances that repel insect pests.

BarbaraRyan1.jpg

Ryegrass shown on left without endophyte, and with endophyte on the right.
Source: http://www.rsnz.org/awards/teacher_fellowships/profiles2006/BarbaraRyan.php

endophyte.jpg

The tall fescue endophyte fungus is found inside a leaf sheath cell.
Source: http://www.goatworld.com/articles/nutrition/tallfescuetoxicosis.shtml

endophyteseed.sized.jpg

Source: Ohio State University Turfgrass Program