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GROWTH PARAMETERS 299
studies are completed, the taxonomy of this group is unlikely to be further resolved by macroscopic
or microscopic analyses.
Description: Sharing the general shape and appearance of P. ostreatus except the primordia are
bright reddish ("salmon-egg") pink, becoming pinkish as mushrooms develop, eventually a dull pink
to light pinkish cinnamon colored and often fading to straw-colored when over-mature. (The color
transitions are not only age-dependent, but vary between strains and are influenced by light conditions.)
Cap convex expanding with age to broadly convex to plane. Cap margin inrolled at first, then
incurved, and eventually flattening and upturning at maturity. The gills are particularly strongly pigmented
with pinkish tones when young, fading to a creamy beige in age. Commonly growing in
clusters of multiple mushrooms. When cultivated, variants often appear from the same fruiting container
as the pink forms. These variants range in color from beige to cream to white, usually with
white to gray gills, and often with a highly undulating, scallop-like cap margin.
Distribution: A tropical mushroom complex, widespread throughout the tropics and subtropics.
Mushrooms from this group have been collected in Thailand, Cambodia, Singapore, Vietnam,
Ceylon, Malaysia, New Guinea, North Borneo, Japan, Brazil, Mexico and theAntilles.A pink Oyster
mushroom from Amazonia probably belongs to this species complex.
Natural Habitat: Preferring tropical and subtropical hardwoods including palms, rubber trees, and
also found on bamboo.
Microscopic Features: From the same fruiting column, I obtain pink spores from pink mushrooms
Figure 271. The Pink Oyster mushroom fruiting from bags of sterilized sawdust in Thailand.
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