Chocolate Rim Lichen vs Polar bear

Protoparmelia badia compared with Ursus maritimus

Key Differences

Chocolate Rim Lichen is Near Threatened while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Chocolate Rim Lichen	Polar bear
Kingdom	Fungi (菌界)	Animalia (動物)
Phylum	Ascomycota (子嚢菌門)	Chordata (脊索動物)
Class	Lecanoromycetes (チャシブゴケ菌綱)	Mammalia (哺乳類)
Order	Lecanorales (チャシブゴケ目)	Carnivora (ネコ目)
Family	Parmeliaceae	Ursidae (Bears)
Genus	Protoparmelia	Ursus (Bears)
Species	Protoparmelia badia	Ursus maritimus

Conservation Status

Chocolate Rim Lichen

NT — Near Threatened

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Chocolate Rim Lichen

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, Portugal, Sweden, and United States. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

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.

Chocolate Rim Lichen

The Chocolate Rim Lichen (Protoparmelia badia) is a crustose lichen in the family Parmeliaceae, found on exposed siliceous and acid rocks in montane and subalpine environments across Europe, North America, and other temperate and boreal regions. Crustose lichens form a tightly adhering crust directly on rock surfaces and lack the lobed margins of foliose lichens, making them impossible to remove from substrate without destroying the thallus. Protoparmelia badia forms a thin, pale grey to brownish-grey thallus with conspicuous reddish-brown to dark chocolate-brown apothecia (disc-shaped reproductive structures), from which the common name derives. The species is typical of well-lit, clean-air rocky habitats such as mountain summits, upland heathland, and acidic outcrops. Like many lichens, it is a pioneer coloniser of bare rock surfaces and contributes to the initial stages of soil formation. The IUCN classifies P. badia as Near Threatened, reflecting concerns about declining populations linked to air pollution — lichens are renowned biological indicators of air quality, being highly sensitive to sulphur dioxide, nitrogen oxides, and ammonia — as well as climate change effects on montane habitats and disturbance from rock climbing and other outdoor recreation.

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。