)
Fig. 307 Tylose . An outgrowth into the xylem vessel.
tyloseor tylosis
an outgrowth from xylem parenchyma in the XYLEM VESSELS, produced in response to either severe water shortage or, more usually, to the presence of pathogenic organisms. The growth of tyloses often causes the vessels to become blocked, so preventing water transport.Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005