Scientific name: Armillaria gallica Marxm. &
Romagn.; Armillaria gemina Berube & Dessur.;
Armillaria ostoyae (Romagn.) Herink; Armillaria
Berube & Dessur.
Derivation of name: Gallica means ; Gemina means
Ostoyae means ; Sinapina means
Occurrence on wood substrate: Most species are
some are saprobic; depending on the species,
they may occur
specimens or in cespitose
clusters, they may appear
terrestrial or fruit on visible
wood, and they may be
associated with hardwood or
conifer tree species; many form
allowing for tree-to-tree spread of the fungus.
Dimensions: Consult field guides.
Cap: Smooth or scaly, depending on the species. Consult
Stipe: Consult field guides. In species with a cespitose
habit, each stipe base tapers to a point.
Veil: Present (but lacking in A. tabescens).
Edibility: The various species are considered edible
which is not surprising given that they were all (other than
once considered variants of A. mellea.
Even so, some individuals are intolerant.
Comments: The keys in the websites below include
seven Armillaria species found east of the Rocky
Mountains. A number of them can be identified
certainty only through microscopic examination.
More information (Armillaria) at MushroomExpert.com:
More information (A. ostoyae) at MushroomExpert.com:
More information (A. gallica) at MushroomExpert.com:
More information (key to species) at TomVolkFungi:
Figure 1. A. gallica. Photo © Gary Emberger.
Figure 2. A. gallica. Photo © John Plischke III.
Figure 3. A. gallica and Entoloma abortivum.
Photo © Gary Emberger.
Figure 4. A. gemina. Photo © John Plischke III.
Figure 5. A. ostoyae. Photo © John Plischke III.
Figure 6. A. ostoyae. Photo © John Plischke III.
Figure 7. A. sinapina. Photo © John Plischke III.