noun, plural ap·pres·so·ri·a [ap-re-sawr-ee-uh, –sohr-] /ˌæp rɛˈsɔr i ə, -ˈsoʊr-/. Mycology.

  1. a flattened and thickened tip of a hyphal branch, formed by some parasitic fungi, that facilitates penetration of the host plant.

noun plural -ria (-rɪə)

  1. botany a flattened hypha of a parasitic fungus that penetrates the host tissues

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