Sarah Duhon

Unido: 29.sep.2017 Última actividad: 04.jul.2020

I am an Environmental Science 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.

Long story short, there have been attempts to characterize species like S. ostrea and S. hirsutum as complexes that include multiple other species. For example, A. L. Welden (1971) thought that S. hirsutum must include S. complicatum, S. versicolor, S. gausapatum, S. styracifluum, and S. subtomentosum, all parts of a continuum of morphological variation. Some authors agreed, some disagreed, but generally the idea didn't catch on.

When Paul L. Lentz previously suggested (in 1955) that the west hemisphere species S. fasciatum and S. lobatum be synonymized with S. ostrea, some species from Malaysia, it did catch on. However, the work I have done on the molecular phylogeny of eastern North American Stereum shows a different picture - S. fasciatum and S. lobatum are genetically distinct, and trait-mapping reveals that the morphological characters of these species are not as ambiguous as it seemed to past authors.

S. lobatum has wide chestnut bands where the fine short hairs wear away, stains yellow, and tends to be very lobate (https://www.inaturalist.org/observations?place_id=any&project_id=stereum-lobatum&verifiable=any).

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 (https://www.inaturalist.org/observations?place_id=any&project_id=stereum-fasciatum&verifiable=any)

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.

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