Agaricomycotina were formerly based entirely upon the growth form of the mushroom. Molecular phylogenetic investigation (as well as supporting evidence from micromorphology and chemotaxonomy) has since demonstrated that similar types of basidiomycete growth form are often examples of convergent evolution and do not always reflect a close relationship between different groups of fungi. For example, agarics have arisen independently in the Agaricales, the Boletales, the Russulales, and other groups, while secotioid fungi and false truffles have arisen independently many times just within the Agaricales. See also Ascocarp Conidium References External links Evolution & Morphology in the Homobasidiomycetes: The Clade/Morphology Chart by Gary Lincoff & Michael Wood, MykoWeb, November 27, 2005. "Mycomorphology Part 1: Why Do Mushrooms Look Like Mushrooms?" by Peter Werner, Mycena News, December 2002. (Archived at MycoWeb) "Mycomorphology Part 2: Basidiocarp Keeps its Balance" by Peter Werner, Mycena News, March 2003. (Archived at MycoWeb) Fungal morphology and anatomy