Rötender Wirrling vs Ulmen-Fleckenspanner

Abortiporus biennis compared with Abraxas sylvata

Key Differences

Rötender Wirrling is Near Threatened while Ulmen-Fleckenspanner is Vulnerable.

Taxonomic Classification

Rank	Rötender Wirrling	Ulmen-Fleckenspanner
Kingdom	Fungi (Pilze)	Animalia (Tier)
Phylum	Basidiomycota (Ständerpilze)	Arthropoda (Gliederfüßer)
Class	Agaricomycetes (Mushrooms)	Insecta (Insekten)
Order	Polyporales (Stielporlingsartige)	Lepidoptera (Schmetterlinge)
Family	Podoscyphaceae	Geometridae
Genus	Abortiporus	Abraxas
Species	Abortiporus biennis	Abraxas sylvata

Conservation Status

Rötender Wirrling

NT — Near Threatened

Ulmen-Fleckenspanner

VU — Vulnerable

Physical Characteristics

Attribute	Rötender Wirrling	Ulmen-Fleckenspanner
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Rötender Wirrling

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Widely distributed across Asia (Taiwan), Europe (5 countries), North America (United States), and South America (Brazil). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Ulmen-Fleckenspanner

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Rötender Wirrling

The Blushing Rosette (Abortiporus biennis) is a species in the genus Abortiporus. It is currently classified as Near Threatened on the IUCN Red List. Typically found in forest floors, decomposing wood, and soil ecosystems.

Ulmen-Fleckenspanner

The clouded magpie (Abraxas sylvata) is a geometrid moth in the family Geometridae found across temperate Europe, extending eastward through Russia to Japan. The adult wingspan measures approximately 32–42 mm, with white wings bearing a distinctive pattern of yellow-orange and dark grey to black spots and patches arranged in rows across the forewing and hindwing, creating a striking patterned appearance resembling the magpie coloring of the related magpie moth Abraxas grossulariata, but with a more yellowish, muted tone and less black — hence 'clouded.' Adults fly in one generation from June to July, resting on leaf surfaces and attending woodland flowers for nectar. The larvae feed on wych elm (Ulmus glabra) and occasionally other Ulmus species in mature deciduous woodland and woodland edges. The clouded magpie has become less common in parts of its European range due to the widespread loss of mature elms from Dutch elm disease, which devastated European elm populations from the 1970s onward. Conservation of this species requires the protection of surviving mature elm trees and management of regrowth elms in woodland ecosystems.