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Aleuria rhenana

[ Ascomycetes > Pezizales > Pyronemataceae > Aleuria . . . ]

by Michael Kuo

Similar to the "Orange Peel Fungus," Aleuria aurantia, this bright orange cup fungus develops a rudimentary stem and has slightly larger spores. It is also usually somewhat smaller than its stemless counterpart. Though probably widely distributed, Aleuria rhenana is uncommon, and is most frequently found under conifers on the West Coast in fall and winter. The fact that it is also found in Japan (see Hiroshi Takahashi's photo to the right) prompts consideration of some sort of "land bridge" or "rafting" explanation for its distribution.

Sowerbyella rhenana is a synonym.


Ecology: Saprobic, growing gregariously or in clusters on the ground, usually in conifer woods; summer and fall, or in winter on the West Coast; apparently widely distributed in North America but more common in the west.

Fruiting Body: Cup-shaped; 1-2 cm across; bright orange to yellowish orange above; undersurface often whitish-fuzzy, at least when young, but often orange and more or less smooth; with a rudimentary stem 1-3 cm long and up to .5 cm wide, attached to a prominent mass of whitish mycelial material. Odor none. Flesh orangish; brittle.

Microscopic Features: Spores 20-23 x 11-13 µ; becoming warted and reticulate by maturity; elliptical. Asci eight-spored; up to 350 x 17 µ. Paraphyses with swollen ends, with yellowish to orangish contents in a KOH mount.

REFERENCES: Fuckel, 1869/1870. (Seaver, 1928; Arora, 1986; Barron, 1999.)

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Aleuria rhenana

Aleuria rhenana

Aleuria rhenana

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Kuo, M. (2005, January). Aleuria rhenana. Retrieved from the MushroomExpert.Com Web site: