details of gill structure
the mushroom has broad, fan or oyster-shaped cap spanning 5–25 cm; natural specimens range white gray or tan dark-brown; margin inrolled when young, , smooth , lobed or wavy. flesh white, firm, , varies in thickness due stipe arrangement. gills of mushroom white cream, , descend on stalk if present. if so, stipe off-center lateral attachment wood. spore print of mushroom white lilac-gray, , best viewed on dark background. mushroom s stipe absent. when present, short , thick.
omphalotus nidiformis toxic lookalike found in australia , japan. in north america, omphalotus olivascens, western jack-o -lantern mushroom , clitocybe dealbata, ivory funnel mushroom, both bear resemblance pleurotus ostreatus. both omphalotus olivascens , clitocybe dealbata contain muscarine , toxic.
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