David S. Hibbett

David S. Hibbett is an American mycologist working on fungal phylogenetics, based at Clark University. His most cited work is the classification published in Mycological Research in 2007, "A higher-level phylogenetic classification of the Fungi", on which he is first author alongside a large group of co-authors.

The significance of that document lies not in the novelty of individual findings but in achieving agreement. By 2007 molecular data were already plentiful but scattered across dozens of papers with different scopes and different naming conventions. Gathering them into one classification covering ranks from kingdom down to orders required negotiating a position between specialists on groups that have little in common beyond all being fungi.

A second thread in Hibbett's research is the evolution of nutritional modes: transitions between wood decay, saprotrophy and mycorrhiza. The question is how often a change of lifestyle has recurred in fungal history, and whether enzymes once lost can be regained. Answering it requires exactly what an agreed phylogeny provides — the ability to map a trait onto a tree.

The 2007 classification is being revised today, as it was meant to be. What matters more is that revisions are now proposed against a shared skeleton. The shift from "everyone has their own tree" to "everyone corrects one tree" is a qualitative difference in systematics.

A career like his also shows what phylogenetic work consists of. It is not collecting specimens in the field or making spectacular species discoveries, but comparing sequences, testing alternative tree topologies and judging how robust a result is to a change of model. The outcome is often a sentence saying that two groups long regarded as close relatives are nothing of the kind — and the rewriting of a textbook chapter.

In the day-to-day work of a service like MykoRadar this labour is invisible and everywhere at once. The rank of a taxon, a species' family, the decision whether a given name is a synonym — all of it comes from a taxonomic backbone built on an agreed phylogeny.

What the 2007 classification actually agreed

Hibbett and 66 co-authors accepted one subkingdom, seven phyla, ten subphyla, 35 classes, 12 subclasses and 129 orders for kingdom Fungi. The scheme contained 195 taxa down to order, 16 of them described or validated in the paper. Its most recognisable surviving result is Dikarya, the subkingdom uniting Ascomycota and Basidiomycota. The authors explicitly excluded organisms once treated as fungi but outside the monophyletic kingdom, including oomycetes and slime moulds.

This was infrastructural consensus, not a “final tree.” Contributors represented AFTOL and Deep Hypha as well as resources such as the Dictionary of the Fungi, GenBank and Myconet, all of which needed a shared backbone. Later classifications alter phylum counts and placements, but can state exactly what they revise. Clark University’s profile confirms that Hibbett’s research spans molecular systematics, comparative genomics, development and paleomycology—the broader programme behind that taxonomic synthesis.