vs Polar bear

Ciboria viridifusca compared with Ursus maritimus

Key Differences

is Least Concern while Polar bear is Vulnerable.

Taxonomic Classification

Rank		Polar bear
Kingdom	Fungi (菌界)	Animalia (動物)
Phylum	Ascomycota (子嚢菌門)	Chordata (脊索動物)
Class	Leotiomycetes (Leotiomycetes)	Mammalia (哺乳類)
Order	Helotiales (Helotiales)	Carnivora (ネコ目)
Family	Sclerotiniaceae	Ursidae (Bears)
Genus	Ciboria	Ursus (Bears)
Species	Ciboria viridifusca	Ursus maritimus

Conservation Status

LC — Least Concern

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

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.

Ciboria viridifusca is a saprotrophic discomycete in the family Sclerotiniaceae, found in temperate Europe. It produces small, stalked cup-shaped fruiting bodies with an olive-brown to greenish-brown (viridifusca: green-brown) coloration, which distinguishes it from other members of the genus with more uniformly tan or chestnut coloration. The species fruits on fallen catkins or other plant debris in moist deciduous woodland, typically in spring or early summer following the fall of host plant material. It is classified as Least Concern, indicating stable populations within its European range. Ciboria viridifusca contributes to saprotrophic communities in woodland ecosystems, decomposing fine organic litter and participating in the cycling of carbon and nutrients. Like other Ciboria species, it is a specialist saprotroph closely tied to the availability of suitable host plant substrates. Identification requires microscopic examination, and this species may be confused with related taxa without careful analysis of spore dimensions and color. The genus Ciboria is part of the broader Sclerotiniaceae family, which is well-studied owing to its inclusion of economically important plant pathogens, though the Ciboria species themselves are benign decomposers. Records of this fungus are scattered across central Europe, and accurate distribution mapping requires systematic mycological surveys. Conservation of mature deciduous woodland benefits discomycete diversity broadly.

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。