Rigidoporus ulmarius

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Rigidoporus ulmarius

Kingdom:	Fungi
Phylum:	Basidiomycota
Class:	Basidiomycetes
Subclass:	Agaricomycetidae
Order:	Polyporales
Family:	Meripilaceae
Genus:	Rigidoporus
Species:	R. ulmarius

Binomial name

Rigidoporus ulmarius
(Sowerby) Imazeki, (1952)

Synonyms

Boletus ulmarius Sowerby, (1797)
Coriolus actinobolus (Mont.) Pat., (1903)
Fomes geotropus (Cooke) Cooke, (1885)
Fomes ulmarius Fr., (1874)
Fomes ulmarius (Sowerby) Gillet,(1878)
Fomitopsis ulmaria (Sowerby) Bondartsev & Singer, (1941)
Haploporus cytisinus (Berk.) Domanski, (1973)
Leucofomes ulmarius (Sowerby) Kotl. & Pouzar, (1957)
Mensularia ulmaria (Sowerby) Lázaro Ibiza, (1916)
Microporus actinobolus (Mont.) Kuntze, (1898)
Placodes incanus Quél., (1886)
Placodes ulmarius (Sowerby) Quél., (1886)
Polyporus actinobolus Mont., (1854)
Polyporus cytisinus Berk., (1836)
Polyporus fraxineus Lloyd, (1915)
Polyporus geotropus Cooke, (1884)
Polyporus sublinguaeformis Schulzer, (1882)
Polyporus ulmarius (Sowerby) Fr., (1821)
Polystictus actinobolus (Mont.) Cooke, (1886)
Rigidoporus geotropus (Cooke) Dhanda, (1981)
Rigidoporus geotropus (Cooke) Imazeki, (1955)
Scindalma cytisinum (Berk.) Kuntze, (1898)
Scindalma geotropum (Cooke) Kuntze, (1898)
Scindalma ulmarium (Sowerby) Kuntze, (1898)
Ungulina cytisina (Berk.) Murashk., (1940)
Ungulina incana (Quél.) Pat.,2 (1900)
Ungulina ulmaria (Sowerby) Pat., (1900)

Rigidoporus ulmarius is a plant pathogen found mainly on broad leaved trees. It used to be very common on Elm.

The fruiting bodies are white, knobbly and fairly hard, requiring a fair amount of force to break. Older bodies may be covered with green algae, or partially covered with vegetation and leaves making them difficult to spot. They often encapsulate grass, twigs and other debris.

Tubes are 1–5mm long in each layer, pinkish to orange when young, browning with age, each layer separated by a thin contrasting band of white flesh. Pores 5–8 per mm, red-orange fading to clay-pink or buff with age. Spores pale yellow, globose, 6–7.5um in diameter. Hyphal structure monomitic; generative hyphae lacking clamps. Habitat at the base of trunks of deciduous trees, usually elm. Season all year, perennial. Common. Not edible. Found In Europe.