Clustered Mushroom vs Common Seal

Agaricus cappellianus compared with Phoca vitulina

Key Differences

Clustered Mushroom is Not Evaluated while Common Seal is Near Threatened.

Taxonomic Classification

Rank	Clustered Mushroom	Common Seal
Kingdom	Fungi (Fungi)	Animalia (Animals)
Phylum	Basidiomycota (Club Fungi)	Chordata (Chordates)
Class	Agaricomycetes (Mushrooms)	Mammalia (Mammals)
Order	Agaricales (Gilled Mushrooms)	Pinnipedia (Seals & Sea Lions)
Family	Agaricaceae (Agarics)	Phocidae (True Seals)
Genus	Agaricus (Button Mushrooms)	Phoca (Harbor Seals)
Species	Agaricus cappellianus	Phoca vitulina

Conservation Status

Clustered Mushroom

NE — Not Evaluated

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

Physical Characteristics

Attribute	Clustered Mushroom	Common Seal
Diet	—	Carnivore
Average Lifespan	—	30 years
Average Length	—	1.7 m
Average Weight	—	80.0 kg

Habitat & Geographic Range

Clustered Mushroom

Habitat

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

Common Seal

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (7 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Clustered Mushroom

Agaricus cappellianus is a saprotrophic agaric fungus in the family Agaricaceae, the family containing the cultivated button mushroom (A. bisporus). Like other members of the genus Agaricus, A. cappellianus produces a cap with free gills that start out white or pink and darken to brown or blackish-brown as the spores mature. The stipe bears an annulus (ring) and is separate from the cap at maturity. A. cappellianus is known primarily from Europe, where it grows in grassy habitats, woodland edges, and gardens. The genus Agaricus is large, with hundreds of species globally, and field identification can be challenging. Important identification characters include cap color and texture, flesh-bruising reactions (yellowing or reddening), smell (anise-like vs. phenolic), spore color and size, and stipe characteristics. Some Agaricus species are edible and prized, while others contain phenolic compounds that cause gastrointestinal upset. Formal IUCN conservation status has not been assessed for A. cappellianus. The species has not been widely studied, and limited information is available on its ecology, host range, and distribution.

Common Seal

The most widely distributed pinniped, harbor seals inhabit temperate and subarctic coastal waters of both the North Atlantic and North Pacific. Adults reach up to 130 kg and spend roughly equal time at sea hunting fish, squid, and crustaceans and hauling out on beaches or rocks to rest. Their large, expressive eyes are adapted for underwater vision in low light. Harbor seals are a critical food source for orcas, sharks, and polar bears.