appressorium
noun
a flattened and thickened tip of a hyphal branch, formed by some parasitic fungi, that facilitates penetration of the host plant.
The grammatical form denoting more than one person, place, thing, or idea.
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In Botrytis the appressoria assume the form of dense tassels of short branches.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various