1) Class 2) Class gasteromycetes 3) Class gastromycetes 4) Gastromycetes 1) Gastromycetes 
The group of Basidiomycetes with spores borne in cavities within the fruit body. 
• (n. pl.) An order of fungi, in which the spores are borne inside a sac called the peridium, as in the puffballs.
name often given to a subgroup of fungi consisting of more than 700 species in the phylum Basidiomycota (kingdom Fungi). Their spores, called ...
Gas`te·ro·my·ce'tes noun plural [ New Latin , from Greek ... stomach + ... a mushroom.] (Botany) An order of fungi, in which the spores are borne inside a sac called the peridium, as in the puffballs. 
[n] - fungi in which the hymenium is enclosed until after spores have matured: puffballs