cleistothecium

…ascocarp (in forms called apothecium, cleistothecium [cleistocarp], or perithecium) contain saclike structures (asci) that usually bear four to eight ascospores. Apothecia are stalked and either disklike, saucer-shaped, or cup-shaped with exposed asci. The largest known apothecium, produced by Geopyxis cacabus, has a stalk 1 metre (40 inches) high and a…

…sexual fruiting bodies known as cleistothecia, may form in the mildew. In the spring the cleistothecia crack open to release one or more spore sacs (asci) containing ascospores that blow to nearby plant parts and initiate infection. Overwintering also occurs as mycelial mats on crops or weeds.