Sarah Duhon

Joined: Sep 29, 2017 Last Active: May 08, 2021 iNaturalist

I am an Integrated Biology master's student at the University of Iowa, an employee of Iowa City Parks and Recreation, and I love mushrooms.

I research Stereum, a genus of wood-decay fungi common all over the world. The name Stereum ostrea is most commonly used for large Stereum in North America, despite having been described from Indonesia. The work I have done on the molecular phylogeny of eastern North American Stereum shows that S. fasciatum and S. lobatum (synonyms of S. ostrea) are genetically distinct, and trait-mapping reveals that the morphological characters of these species are not as ambiguous as it seemed to past authors. It is unclear if either of these are synonymous with S. ostrea, or if that species does not occur in North America.

S. lobatum has wide chestnut bands where the fine short hairs wear away, stains yellow, and tends to be very lobate (

S. fasciatum is heavily clothed in short coarse hairs which wear away in thin bands if at all, does not stain color, and the shape is not quite as lobate (

My goal is to create a comprehensive molecular phylogeny for Stereum worldwide, and create resources for casual observers to recognize and correctly identify the phylogenetic species within Stereum, based on morphology and geographic region. Stereum species have been subject to extensive bioprospecting, and parasitic species are of great economic importance, so understanding the diversity of this genus and how it evolved is crucial. I am working on a publication detailing my findings, you can check out the preprint here: If you are interested in sending me specimens, please message me! Details here:

P.S. I collect and dry a lot of my fungi observations and a good memory of exact collection location. If you want specimens of anything I've found, please ask.

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