Arctic grass vs Chocolate Milky

Arctagrostis latifolia compared with Lactarius lignyotus

Key Differences

Arctic grass is Near Threatened while Chocolate Milky is Endangered.

Taxonomic Classification

Rank	Arctic grass	Chocolate Milky
Kingdom	Plantae (식물)	Fungi (균계)
Phylum	Magnoliophyta (피자식물문)	Basidiomycota (담자균류)
Class	Liliopsida (백합강)	Agaricomycetes (주름버섯강)
Order	Poales (벼목)	Russulales (무당버섯목)
Family	Poaceae (Grass Family)	Russulaceae
Genus	Arctagrostis	Lactarius
Species	Arctagrostis latifolia	Lactarius lignyotus

Conservation Status

Arctic grass

NT — Near Threatened

Chocolate Milky

EN — Endangered

Physical Characteristics

Attribute	Arctic grass	Chocolate Milky
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arctic grass

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

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

Chocolate Milky

Habitat

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

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), and North America (United States). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Arctic grass

The Arctic grass (Arctagrostis latifolia) is a species in the genus Arctagrostis. It is currently classified as Near Threatened on the IUCN Red List. Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Chocolate Milky

The Chocolate Milky (Lactarius lignyotus) is a medium-sized ectomycorrhizal mushroom in the family Russulaceae, found in coniferous and mixed forests across Europe, North America, and temperate Asia. Like all members of the genus Lactarius, it exudes a milky latex when the flesh is broken — in L. lignyotus, this latex is white and acrid, contributing to the genus's widespread edibility variation. The fruiting body features a distinctive dark chocolate-brown to sooty-brown, velvety cap with a central boss (umbo), similarly coloured gills, and a dark brown stipe, making it relatively recognisable among forest mushrooms. It grows in close association with spruce (Picea) and fir (Abies) trees, forming ectomycorrhizal symbioses in which the fungal mycelium envelopes root tips and exchanges mineral nutrients for plant photosynthates, a relationship fundamental to the health of boreal and montane conifer forests. The IUCN classifies the chocolate milky as Endangered in certain regional assessments, reflecting declines in suitable habitat quality linked to changes in forest management, nitrogen deposition from atmospheric pollution, and climate change affecting the timing and abundance of fruiting. Accurate population monitoring of ectomycorrhizal fungi is challenging given that the fungal organism itself is largely subterranean, visible only when fruiting.