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Two Groups - classifying fungi into ascomycetes and basidiomycetes:

Truffle-like fungi - basidiomycetes

Setchelliogaster sp. (right)
click to enlarge

The fruiting bodies of the basidiomycete truffle-like fungi are varied in form, sometimes stalked but mostly stalk-less and more-or-less spherical in shape . Internally the fruiting bodies are chambered, with the chambers of some species easy to see with the naked eye - but a hand lens is needed to see the individual chambers in other species. The basidia line the walls of the chambers and protrude into the interiors of the chambers - which are empty in many species, but not in all. In shape the chambers may be anything from spherical to quite contorted. This diagram represents the cross-section of a truffle-like fruiting body. The solid, fleshy areas of the truffle are coloured brown and you can see the basidia (coloured green and bearing dark brown spores) lining the walls of those chambers. Of course, this diagram exaggerates the sizes of both the basidia and the chambers and this simplistic two-dimensional figure does not do justice to the internal convolutions of the three-dimensional fruiting body. The photograph of the stalked Setchelliogaster fruiting body may give you a better idea of the internal structure. On the left you can see the outside appearance and on the right the internal structure. In the latter you can see some of the chambers (of varied forms) and get an idea of the intricate way in which the internal tissue creates those chambers.