A fork of Rural Dictionary
The apothecium is a cup-shaped fruit body with asci that can release spores simultaneously. It is in certain ascomycetes fungi.
On this diagram, we can see this upward "c" like shape. That's the apothecium.
The annulus is a ring of tissue on a mushroom's stem left by a torn partial veil.
The veil has ruptured allowing the mushroom's spores to float away. All that's left is the annulus right below the gills.
An ascocarp, or ascoma (plural: ascomata), is the fruiting body (sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and may contain millions of asci, each of which typically contains four to eight ascospores. - wiki
This ascocarp has apothecium fruiting bodies. You can tell because the fruiting bodies are cup-shaped.