Collection location: Government House, Rockland, Victoria, British Columbia, Canada [Click for map]
: Agaricus bresadolanus Bohus
: Agaricus romagnesii Wasser
: Canada, British Columbia, Victoria, Rockland, Government House
: in the lawn border E of the Government House
: 48.4187° -123.3409° 50m
: flower bed under various trees, incl. Fagus silvatica
: rooted in the leaf compost
: Oluna Ceska
: Oluna Ceska
: Conspicuous copious rhizomorphs
NH3: flesh -, cup surface slighly + (yellowish)
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sum(score * weight) /
(total weight + 1)
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.