Geosmithia
Geosmithia is a genus of anamorphic fungi of uncertain familial placement in the order Hypocreales. The genus, circumscribed by Australian mycologist John Pitt in 1979, is widely distributed. A 2008 estimate placed ten species in the genus, but several new species have since been described. Thousand cankers disease, which affects economically important black walnut ("Juglans nigra") populations in North America, is caused by "Geosmithia morbida". Species in the genus are generally similar to those in "Penicillium", but can be distinguished from them by forming cylindrical conidia from rough-walled phialides. Additionally, the conidia of "Geosmithia" do not have a  green color, in contrast to the characteristic blue-grey or green-grey conidia of "Penicillium". Some "Geosmithia" species have teleomorphic forms that are classified in the genus "Talaromyces". However, "Geosmithia" is a polyphyletic taxon with evolutionary affinities to at least three groups of the euascomycete lineage within the Ascomycota. The generic name "Geosmithia" honors British mycologist George Smith.