Clark'S Mining Bee vs Concentric Boulder Lichen

Andrena clarkella compared with Porpidia crustulata

Key Differences

Clark'S Mining Bee is Least Concern while Concentric Boulder Lichen is Vulnerable.

Taxonomic Classification

Rank	Clark'S Mining Bee	Concentric Boulder Lichen
Kingdom	Animalia (حيوانات)	Fungi (فطر)
Phylum	Arthropoda (مفصليات الأرجل)	Ascomycota (فطريات زقية)
Class	Insecta (حشرات)	Lecanoromycetes (لقنورانية)
Order	Hymenoptera (غشائيات الأجنحة)	Lecideales (Lecideales)
Family	Andrenidae	Lecideaceae
Genus	Andrena	Porpidia
Species	Andrena clarkella	Porpidia crustulata

Conservation Status

Clark'S Mining Bee

LC — Least Concern

Concentric Boulder Lichen

VU — Vulnerable

Physical Characteristics

Attribute	Clark'S Mining Bee	Concentric Boulder Lichen
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Clark'S Mining Bee

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (5 countries) and North America (United States).

Concentric Boulder Lichen

Habitat

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

Range

Distributed across Denmark, Norway, Portugal, Sweden, and United States. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Clark'S Mining Bee

The Clark'S Mining Bee (Andrena clarkella) is a species in the genus Andrena. It is currently classified as Least Concern on the IUCN Red List. Typically found in virtually all terrestrial and freshwater habitats.

Concentric Boulder Lichen

<em>Porpidia crustulata</em>, commonly known as the Concentric Boulder Lichen, is a crustose lichen in the family Porpidiaceae formed through a symbiotic relationship between a fungal partner (mycobiont) and photosynthetic green algae (photobiont). Like all crustose lichens, it grows tightly appressed to its substrate—typically siliceous or acidic rock surfaces including boulders, cliff faces, and pebbles in open, well-lit habitats—forming thin, grayish to pale thalli marked by scattered black apothecia (reproductive discs). <em>Porpidia crustulata</em> derives nutrition entirely through photosynthesis conducted by its algal partner, requiring no external organic food source. The species has been documented in Denmark, Norway, Portugal, Sweden, and the United States, suggesting a broad boreal to temperate distribution across the Northern Hemisphere. It is currently classified as Vulnerable by the IUCN, indicating significant conservation concern, likely linked to threats including air pollution, acidification, quarrying of rocky habitats, and changes in land use that reduce the availability of suitable substrates. Crustose lichens are typically slow-growing, long-lived organisms with limited capacity for rapid range shifts in response to environmental change. Biological traits such as individual lifespan, growth rates, and reproductive output remain poorly documented at the population level.