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GROWTH PARAMETERS 309
Pleurotus euosmus (Berkeley apud Hussey) Saccardo
Figure 278. P euosmus mycelia 3 and 10 days after inoculation onto malt extract agar media.
Introduction The Tarragon Oyster mushroom is closely related to Pleurotus ostreatus. According
to Watling & Gregory (1989), this mushroom is generally considered a form or variety of P
ostreatus, but differs in the strong smell of tarragon. It has been reported, to date, from England and
Scotland. P euosmus behaves, in culture, similarly to P ostreatus.
Common Names: The Tarragon Oyster Mushroom.
Taxonomic Synonyms & Considerations: Pleurotus euosmus can be distinguished from P
ostreatus by its odor (tarragon) and by spore size. The spore size of P euosmus is 12-14 substantially
larger than the 7.5-11 spores of the EuropeanP ostreatus collections. However, I would not be
surprised that these taxa are found to be conspecific through interfertility or DNA studies. Hilber
(1989) suggests synonymy between these two taxa without elaboration. The morphology of this
mushroom—with its depressed cap at maturity and long running gills—bears strong resemblance to
Pleurotus ostreatus.
Pleurotus eous (Berkeley) Saccardo is a discretely separate species from P euosmus and is more
closely allied to the pink P djamorvarieties than to the gray brown P ostreatus and allies. (See Pegler
(1972) and Corner (1981)). Chang & Miles make reference to nutritional analysis of "Pleurotus
eous" in Edible Mushrooms & their Cultivation (1987, pg. 28) without further elaboration. See also
the taxonomic discussions of P djamor and P ostreatus.
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