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At my wedding, my mom's speech centered around a vial of tiny origami swans I'd made for her as a child. Each was smaller than a pea. I've always loved really small things, and that's part of what drew me to study fungi. Here is a delightfully small fungus called Hypocrella turbinata. It is a quicktime object/movie that you can manipulate with your mouse.

My lab has been revising the genus Hypocrella. To "revise" a group is to painstakingly examine every species ever included, all the types from herbaria around the world, and all the modern specimens you can get your hands on. Then the exercise is something like this: Dump out a bag of marbles on the floor. Decide how you will sort them. Are the light blue ones a different species from the dark blues? Do cat's eyes and aggies belong to the same genus? (You might want to use some additional characters, like DNA sequences or biochemistry to resolve difficult boundaries). Once you've made your sort, apply the rules of the International Code of Botanical Nomenclature to find out which existing names apply to each of your marble species. Make up new names for the rest. That's revisionary taxonomy.

See: Liu, M., P. Chaverri, and K. T. Hodge. 2006. A taxonomic revision of the insect biocontrol fungus Aschersonia aleyrodis, its allies with white stromata and their Hypocrella sexual states. Mycological Research 110(5): 537-554.
Chaverri, P., M. Liu, K.T. Hodge. 2008. Neotropical Hypocrella (anamorph Aschersonia), Moelleriella, and Samuelsia." Studies in Mycology 60: 1-68.