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. 2019 Jul 24;10:951. doi: 10.3389/fpls.2019.00951

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Copyright © 2019 Fröbel and Zyprian.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Fan-shaped hyphae forming haustoria. Microscopic views taken from a shoot tip (A) and from a berry (B) of “Müller-Thurgau.” It is evident that the fan-shaped hyphae of P. viticola produce haustoria in these tissues. f, fan-shaped hyphae; h, haustoria.