Arctic Blue vs Common Stump Brittlestem

Agriades aquilo compared with Psathyrella piluliformis

Key Differences

• Arctic Blue is Near Threatened while Common Stump Brittlestem is Least Concern.

Taxonomic Classification

Rank	Arctic Blue	Common Stump Brittlestem
Kingdom	Animalia (животные)	Fungi (грибы)
Phylum	Arthropoda (членистоногие)	Basidiomycota (базидиомицеты)
Class	Insecta (насекомые)	Agaricomycetes (агарикомицеты)
Order	Lepidoptera (чешуекрылые)	Agaricales (агариковые)
Family	Lycaenidae	Psathyrellaceae
Genus	Agriades	Psathyrella
Species	Agriades aquilo	Psathyrella piluliformis

Conservation Status

Arctic Blue

NT — Near Threatened

Common Stump Brittlestem

LC — Least Concern

Physical Characteristics

Attribute	Arctic Blue	Common Stump Brittlestem
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arctic Blue

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Finland, Norway, Russia, and Sweden. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Common Stump Brittlestem

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).

Arctic Blue

The Arctic Blue (Agriades aquilo) is a species in the genus Agriades. It is currently classified as Near Threatened on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

Common Stump Brittlestem

<em>Psathyrella piluliformis</em>, the common stump brittlestem, is a saprotrophic basidiomycete fungus in the family Psathyrellaceae, order Agaricales. It has a broad distribution across Asia, Europe, and the Americas, typically found growing in dense clusters on or near the stumps and buried roots of deciduous trees, particularly oaks and beeches, from autumn through to early winter. The fruitbodies are hygrophanous, changing colour dramatically depending on moisture content, ranging from pale buff when dry to a rich honey-brown when wet. <em>Psathyrella piluliformis</em> plays an important ecological role as a wood decomposer, facilitating the breakdown of lignin and cellulose and contributing to nutrient cycling in forest ecosystems. The fragile, brittle gills and thin-walled spores are characteristic of the genus. Biological traits including average mycelial lifespan, fruiting body dimensions under natural conditions, and specific substrate preferences remain poorly documented. The species is assessed as Least Concern by the IUCN, reflecting its wide distribution and apparent abundance across temperate woodland habitats in the Northern Hemisphere and beyond.

Shared Countries

Both species can be found in 2 countries:

🇳🇴 Norway 🇸🇪 Sweden