• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Cyathus gracilis H.J. Brodie

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Scientific name
Cyathus gracilis
H.J. Brodie
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Larissa Trierveiler-Pereira
Comments etc.
Larissa Trierveiler-Pereira

Assessment Notes

Taxonomic notes

Peridium infundibuliform, 7–12 mm high, 5–9 mm wide at the mouth, not expanding at the top or tapering abruptly at the base; attached to the substrate by a conspicuous emplacement, chocolate brown to dark brown (6F5–8F6), 2.5–6 mm in diameter. Exoperidium hairy, concolor to the emplacement, covered with a 0.7–1 mm tomentum, arranged in regular and flexible tufts; external wall smooth to faintly plicate, 0.4–0.7 mm between folds. Mouth minutely fimbriated, 0.1–0.3 mm, chocolate brown to dark brown (6F4–8F6). Endoperidium brownish grey to greyish brown (7D2–7F3), smooth to faintly plicate, 0.5–0.75 mm between folds, slightly bright, not contrasting with the exterior. Stipe 1.5–3 mm length, greyish brown to brownish grey (7E2–6F2); epiphragm white, flexible. Peridioles 1.5–2.5 (3) mm × 1.5–2.5 mm, greyish brown (7F3), 12–18 per basidioma, irregular to circular in outline. Tunic hyaline, bronze. Cortex double layered. Basidiospores smooth, hyaline, elliptical to ovoid, without an apicule, 13.97–19.05 × 10.16–13.97 µm (L = 16.93 µm; W = 11.43 µm; Qm = 1.49), thin walled 1.27–2.54 µm. Growing on rotten wood.

Why suggested for a Global Red List Assessment?

Known from a few countries. In Brazil, known from protected area. We, thus, suggest this species to be categorized as Near Threatened (NT).

Geographic range

Known from tropical America, eastern Asia and Australasia (4 countries).

Population and Trends

There are 33 records of this species in GBIF, most of them from Brazil (21). Disjunction distribution might indicate a complex of species.

Population Trend:

Habitat and Ecology

In Brazil, there are records from a few states (4). Found on rotting wood. In Brazil, the species is found in Atlantic Forest, Amazon Forest, and Caatinga.

Subtropical/Tropical Dry ForestSubtropical/Tropical Moist Lowland ForestSubtropical/Tropical Dry ShrublandSubtropical/Tropical Moist Shrubland


Only a few records from Brazil. It is found in the Atlantic Forest, a hotspot, in the Amazonia (currently being deforested at the highest rates in the last decades) and Caatinga (threatened with desertification).

Housing & urban areasAgro-industry farmingAgro-industry grazing, ranching or farmingMining & quarryingRoads & railroads

Conservation Actions

Reports in Brazil are from protected area.

Site/area protection

Research needed

More taxonomic studies to better understand the disjunction distribution of the species and more collections.

TaxonomyPopulation size, distribution & trends

Use and Trade



Country occurrence

Regional Population and Trends

Country Trend Redlisted