Marasmius siccus

Marasmius siccus, or orange pinwheel,[1] is a small orange mushroom in the Marasmius genus, with a "beach umbrella"-shaped cap. The tough shiny bare stem is pale at the top but reddish brown below, and the gills are whitish. The stem is 3–7 centimetres (1.2–2.8 in) tall and the cap is 0.5–2.5 centimetres (0.20–0.98 in) wide.[2][3][4][5]

Marasmius siccus
Scientific classification
Kingdom:
Fungi
Division:
Basidiomycota
Class:
Agaricomycetes
Order:
Agaricales
Family:
Marasmiaceae
Genus:
Marasmius
Species:
M. siccus
Binomial name
Marasmius siccus

At a microscopic level, the club-shaped spores are very long and thin, being roughly 19 µm by 4 µm. The distinctive cheilocystidia are broadly club-shaped with finger-like protrusions at the far end. Such cells also sometimes occur in other related mushrooms and they are known as "broom cells of the siccus type".[4][5]

This mushroom is found in hardwood forests from the Rocky Mountains to the Appalachian Mountains[6] and also in northern Europe and Asia.[4][5]

A cluster of M. siccus
Gills and the stem, which lightens at the top

References
  1. "Marasmius siccus". Indiana University. Retrieved 16 February 2015.
  2. Kuo, Michael. "Marasmius siccus". MushroomExpert.Com. Retrieved 16 February 2015.
  3. "Marasmius siccus". University of Arkansas. Retrieved 16 February 2015.
  4. Antonín, V.; Noordeloos, M. E. (2010). A monograph of marasmioid and collybioid fungi in Europe. Postfach 1119, 83471 Berchtesgaden, Germany: IHW Verlag. p. 84. ISBN 978-3-930167-72-2.CS1 maint: location (link)
  5. Knudsen, Thomas; Vesterholt, J., eds. (2018). Funga Nordica Agaricoid, boletoid, clavarioid, cyphelloid and gasteroid genera. Copenhagen: Nordsvamp. p. 360. ISBN 978-87-983961-3-0.
  6. Kuo, Michael; Methven, Andy (2010). 100 Cool Mushrooms. Ann Arbor, MI: University of Michigan Press. p. 115. ISBN 978-0472034178.
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