We are not aware that operculate asci have yet been detected.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke
The small operculate genus Acme is a similar case.
"The History of the European Fauna"
R. F. Scharff
If it has been starved for several days in an aquarium it will attack an operculate form, but rarely with success.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale