Fluted Bird's Nest

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This tiny cup fungi is less than 1cm (~3/8 in.) in diameter and is widely distributed throughout North America.
For an interesting description of Cyathus striatus and how it reproduces, see the Wikipedia entry on this species

Kingdom: Fungi
  Phylum: Basidiomycota
    Class: Agaricomycetes
      Order: Agaricales
        Family: Agaricaceae (formerly classed as Nidulariaceae)
          Genus: Cyathus
            Species: striatus

For a taxonomic tree and links to other fungi posted on Wild Florida Photo see the Fungi at Wild Florida Photo page.