cleistothecium
noun
(in certain ascomycetous fungi) a closed, globose ascocarp from which the ascospores are released only by its rupture or decay.
The grammatical form denoting more than one person, place, thing, or idea.
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They have characteristic conidiophores bearing numerous conidia, and also cleistothecia which are spherical in form and yellowish in colour.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various