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Etheirodon fimbriatum (Pers.) Banker

Bulletin of the Torrey Botanical Club 29 (7): 441 (1902)

fringed steccherinum.
Thin effused crust, with very small teeth 0.2–0.3 mm long. Loosely attached to wood or wood debris. Color typically pale pinkish tan, reddish-gray or violaceous when fresh; though color grayish or darker when dried, in herbarium. Margin of crust noticeably fimbriate (with radiating hyphae) and with cords. Hyphal system dimitic with clamped generative hyphae and simple septate skeletal hyphae. Skeletal hyphae projecting through the teeth as encrusted pseudocystidia (like rock candy sticks). Spores ellipsoid 3–4 × 2–2.5 µm, smooth, thin-walled, inamyloid.
Similar species:
In the Midwest there are other toothed crusts but few have fimbriate (feathered) margins and cords. Phanerochaete chrysorhiza is bright yellow-orange. Kavinia himantia has larger teeth that become ochre (tan) to brown but this crust has white margins and white cords.
Saprobe, on hardwoods and conifers, causing a white rot.
Found June to October in Chicago Region.
Widely distributed across North America. Found throughout Europe, also in Israel, Russia, China, Japan, Polynesia. Occurs in South America.
Chicago Region status:
Rare or overlooked. Recorded in four counties across the region. Found recently in Porter County, Indiana, and McHenry County, Illinois. Surprisingly not seen recently in the much-studied Cook County. There are nine historic records from 1900 to 1904 for Cook County, Illinois, and Lake County, Indiana.
NEOTYPE, by Maas Geesteranus, 1974, near Paris, France.
This species was also placed in the genera Mycoleptodon (1914), Xylodon (1818), and Gloiodon (1931). It was recently placed in a very broad concept for the genus Irpex (2002). Miettinen and others moved the species back to Etheirodon because it is outside the Steccherinum clade.
Specimens examined:
Twelve collections from four counties.
Description links:
Champignons du Québec (French) ; Nineli Lishina slide show on YouTube ; Roland Baranovič, images (Slovakia) ; see also photos and description links at MycoBank.
Related links:
Banker, H. J. 1902. A Historical Review of the Proposed Genera of the Hydnaceae. Bulletin of the Torrey Botanical Club 29(7): 436-448.
Miettinen O., E. Larsson, E. Sjökvist, K-H. Larsson. 2012. Comprehensive taxon sampling reveals unaccounted diversity and morphological plasticity in a group of dimitic polypores (Polyporales, Basidiomycota). Cladistics 28: 251–270.
Records online:
Mushroom Observer for Steccherinum fimbriatum ; MycoPortal for Steccherinum fimbriatum.
Taxon links:
No LSID Number
Steccherinum fimbriatum : 306415 MycoBank ; Index Fungorum ; Species Fungorum