Notes:
Original_Herbarium_Label: Agaricus bresadolanus Bohus
Syn.: Agaricus romagnesii Wasser
Location: Canada, British Columbia, Victoria, Rockland, Government House
location_detail: in the lawn border E of the Government House
Long.Lat.Elev.: 48.4187° -123.3409° 50m
Habitat: flower bed under various trees, incl. Fagus silvatica
Host/Substrate: rooted in the leaf compost
Date: 2018-08-27
Collector(s): Oluna Ceska
Identified_by: Oluna Ceska
Comment(s): Conspicuous copious rhizomorphs
NH3: flesh -, cup surface slighly + (yellowish)
Bruising brown

Species Lists

Images

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Proposed Names

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Comments

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I have a different suggestion…
By: Rick Kerrigan (rwkerrigan)
2018-09-23 11:54:03 EDT (-0400)

The photos, especially of the ring and the color of the pileipellis, strongly suggest that this distinctive and beautifully photographed mushroom belongs in section Xanthodermatei. That said, it is not a species familiar to me. You ought to try to obtain an ITS DNA sequence. Also, you would want to use KOH or NaOH on surfaces and context; I don’t find NH3 useful. Also, the odor is important.

For us, ‘rooted’ means deeply embedded, while the presence of rhizomorphs is fairly common among diverse Agaricus species.

Agaricus bresadolanus belongs to a different section, Spissicaules, and may have an almond odor. There has been confusion about the name and identity of A. romagnesi, most recently treated as a synonym of A. bresadolanus; the taxonomic problem was discussed in Kerrigan et al. 2005 (Mycologia) and later in the books by Parra.

Hope that helps. Nice find.