The mycologists I've worked with, in contrast with many of the botanists I've worked with, tend to be more comfortable saying "I don't know" if they can't identify a specimen of their chosen taxonomic interest. It is a necessity, as we like to believe that most of our plant species (at least in the temperate regions) have been described, while we admit that alpha-taxonomy of fungi is far behind. Fungi are essentially microorganisms, with reduced morphology (fewer distinguishing characteristics), and we often rely on what we can culture, which is a small proportion of the total diversity, as DNA techniques demonstrate.
Thus, I am surprised and not surprised to learn of a new lineage of fungi, just published in the current issue of Nature. I am not surprised that it has been found, but I am surprised at the proposed diversity of this new lineage, which the authors claim may approach half of the total diversity of kingdom Fungi. This new lineage appears to ally with basal lineages of fungi, (e.g. the chytrid genus, Rozella), and members have been found in an amazing diversity of habitats, from marine sediments, to eutrophied freshwater, treated drinking water, and soil around the roots (rhizosphere) of corn and aspen.
These fungi appear to be capable of producing a flagellum, like the chytrids (but lost in the other lineages of fungi), and don't have a chitinous cell wall, but they do appear to have assimilative feeding, like good and true fungi do.
This is a watershed event for mycology, folks.
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