Lentinellus flabelliformis

Lentinellus flabelliformis is a wood-decaying fungus in the family Auriscalpiaceae, order Russulales. It produces small, fan- or spoon-shaped fruiting bodies with a tough, leathery texture and a gill surface typical of the genus, which is characterized by serrated or jagged gill edges rather than smooth ones. As a saprotroph, it breaks down dead and decaying hardwood, contributing to nutrient cycling and the decomposition processes that sustain forest soil health.

Its fruiting is closely tied to the presence of suitable coarse woody debris in mature or undisturbed woodland settings.

The species has a broad but scattered distribution across temperate and some subtropical regions, with records spanning Europe (including Sweden, Norway, Finland, Germany, Spain, and the United Kingdom), North and South America (United States, Canada, Brazil, Argentina, Costa Rica, Suriname), Asia (Japan, South Korea, China, Russia), and Australia. It is restricted to terrestrial habitats, specifically deciduous and mixed woodlands where dead hardwood substrates persist.

Its listing as Vulnerable reflects the ongoing loss of its specific habitat requirements. Intensive forestry practices that remove dead and decaying wood eliminate the substrate this fungus depends on for reproduction. Habitat fragmentation of deciduous woodlands isolates remaining populations, while climate change is altering moisture regimes necessary for fruiting body development.

Collectively, these pressures are reducing the availability of suitable decaying hardwood across its range.

Conservation measures specific to this species are limited, though it may benefit indirectly from broader initiatives promoting deadwood retention in managed forests and protection of old-growth and semi-natural woodlands in parts of its European range. Population trends remain unknown due to insufficient monitoring data. Without targeted survey efforts and deadwood conservation policies, its long-term status is likely to remain precarious.

This fan-shaped fungus inhabits mature deciduous and mixed woodlands, growing specifically on decaying hardwood logs and stumps, particularly beech and oak. It requires stable moisture conditions and the complex microhabitat provided by undisturbed forest floor environments with abundant dead wood.