Cyathus striatus

Scientific name:  Cyathus striatus (Huds.) Willd.
Derivation of name: Cyath- means "cup." Striat-
means "finely furrowed" or "lined" (striate) in reference
to the grooved inner surface. 
SynonymsPeziza striata Huds.  
Common name(s):  Splash cups; Fluted bird's nest.
Phylum:   Basidiomycota
Order:   Agaricales
Family:   Agaricaceae
Occurrence on wood substrate: Saprobic; clustered on
wood chips, bark, fallen branches; summer through fall.   
Dimensions: Vase-shaped cups are up to 2 cm tall and
1cm wide.    
Sterile nest surfaces: Exterior surface dark or grayish-
brown and covered with shaggy or wooly hairs; interior
surface distinctly grooved; shiny; pale gray or grayish-brown;
young vases are covered by a whitish membrane.
Fertile tissue: Gray peridioles ("eggs") occupy the bottom
of the vase-shaped cups; each egg is attached by a thread-
like cord (funiculus) to the inner cup wall.
Edibility: Not edible.
Comments: When an egg is ejected, the trailing cord
(funiculus) helps it adhere to an object it encounters.
More information at   
More information at

Figure 1. Splash cups clustered on rotting wood.
Photo © Gary Emberger.

Figure 2. This award-winning photograph of Cyathus
features the specimens growing on a carpet of green
moss. Photo © Tom Bigelow.

Figure 3. A close-up of three specimens in Figure 2 nicely
shows the shaggy, wooly exterior of this species.
Photo © Tom Bigelow.

Figure 4. Landscape mulch is a great place to look for
bird's nest fungi. Photo © Gary Emberger.

Figure 5. A closer view at some of the "nests" in Figure 4.
The eggs (peridioles) of Cyathus striatus are described as
gray or dark. Note in the specimens above that the eggs
may initially be covered by a whitish material.
Photo © Gary Emberger.

Figure 6. Forces resulting from a drop of water striking
the inside of the "splash" cup eject the eggs from the cup.
Photo © Pam Kaminski.

Figure 7. The hairy outside, grooved inside, and gray
peridioles make this a distinctive fungus.
Photo © Gary Emberger.

Figure 8. The nests on the right still have membranes or
remnants of membranes around the rim of the nest.
Photo © Gary Emberger.

Figure 9. The whitish bands around these splash cups are
hyphae of the ascomycete Hypocrea latizonata, a parasite
known to occur only on Cyathus striatus.
Photo © John Dawson.


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This page © 2008 by Gary Emberger, Messiah College