Polar bear vs

Ursus maritimus compared with Sistotrema pistilliferum

Key Differences

Polar bear is Vulnerable while is Data Deficient.

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Chordata (Chordates)	Basidiomycota (Club Fungi)
Class	Mammalia (Mammals)	Agaricomycetes (Mushrooms)
Order	Carnivora (Carnivorans)	Cantharellales (Cantharellales)
Family	Ursidae (Bears)	Hydnaceae
Genus	Ursus (Bears)	Sistotrema
Species	Ursus maritimus	Sistotrema pistilliferum

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

DD — Data Deficient

Physical Characteristics

Attribute	Polar bear
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Habitat

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

Range

Distributed across Denmark, Norway, and Sweden.

Polar bear

The largest land carnivore on Earth, polar bears can exceed 700 kg and are found across Arctic sea ice from Canada to Russia. Highly specialized marine mammals that rely on sea ice to hunt ringed and bearded seals. Excellent swimmers capable of covering vast distances in open water. Listed as Vulnerable, with populations under severe pressure from rapid Arctic sea ice loss due to climate change.

Sistotrema pistilliferum is a corticioid basidiomycete forming thin, white to cream-colored, waxy resupinate crusts on decaying wood. It inhabits temperate and boreal forests, growing on fallen logs and branches of hardwood and conifer trees. This saprotrophic fungus decomposes dead woody material through white-rot enzymatic processes.