Common Fieldcap vs Common Spike-Rush

Agrocybe pediades compared with Eleocharis palustris

Taxonomic Classification

Rank	Common Fieldcap	Common Spike-Rush
Kingdom	Fungi (Fungi)	Plantae (Plants)
Phylum	Basidiomycota (Club Fungi)	Magnoliophyta (Flowering Plants)
Class	Agaricomycetes (Mushrooms)	Liliopsida (Monocots)
Order	Agaricales (Gilled Mushrooms)	Poales (Grasses)
Family	Strophariaceae	Cyperaceae
Genus	Agrocybe	Eleocharis
Species	Agrocybe pediades	Eleocharis palustris

Conservation Status

Common Fieldcap

LC — Least Concern

Common Spike-Rush

LC — Least Concern

Physical Characteristics

Attribute	Common Fieldcap	Common Spike-Rush
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Fieldcap

Habitat

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

Range

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

Common Spike-Rush

Habitat

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

Range

Widely distributed across Europe (6 countries), North America (Canada, United States), and South America (Chile).

Common Fieldcap

The Common Fieldcap (<em>Agrocybe pediades</em>) is a saprotrophic fungus belonging to the genus Agrocybe within the family Strophariaceae. It typically produces small, tan to pale brown cap-shaped fruiting bodies and is often found growing in clusters or scattered on lawns, grassy areas, forest floors, decomposing wood, and soil-rich ecosystems. The species typically inhabits forest floors, decomposing wood, and soil ecosystems, obtaining nutrients by breaking down dead organic matter. Its geographic range includes several European countries — Belgium, Denmark, Norway, Portugal, and Sweden — as well as the United States in North America. <em>Agrocybe pediades</em> is assessed as Least Concern on the IUCN Red List, reflecting its broad distribution and apparent stability. Biological traits of this species, including specific data on fruiting body size, lifespan, and ecological preferences, remain poorly documented in the scientific literature. Like other members of its genus, it typically fruits during warmer months and often appears after rainfall in nutrient-rich grassland and woodland habitats.

Common Spike-Rush

<em>Eleocharis palustris</em>, commonly known as the common spike-rush, is a perennial wetland sedge in the family Cyperaceae, broadly distributed across the temperate and boreal regions of the Northern Hemisphere. This species typically inhabits shallow freshwater marshes, pond margins, riverbanks, wet meadows, ditches, and other seasonally or permanently flooded habitats, tolerating a range of water depths and soil conditions. Its geographic range spans Europe, Asia, and North America, extending from subarctic regions southward into subtropical zones. Classified as Least Concern on the IUCN Red List, <em>Eleocharis palustris</em> is among the most ecologically widespread wetland plant species globally. It forms dense stands via rhizomatous growth, providing important cover, nesting sites, and food resources for waterfowl and invertebrates. The plant produces leafless green culms up to approximately 60 cm tall, bearing a single terminal spikelet. As a plant, dietary traits in the animal sense are not applicable. Biological traits such as average individual lifespan, body dimensions in the zoological sense, and body weight remain poorly documented, as these metrics are not typically applied to non-vascular measurements in this genus. The species plays a critical ecological role in stabilising wetland sediments and maintaining water quality.

Shared Countries

Both species can be found in 6 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇵🇹 Portugal 🇸🇪 Sweden 🇺🇸 United States