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

Geastrum rusticum Baseia, B.D.B. Silva & T.S. Cabral

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Scientific name
Geastrum rusticum
Baseia, B.D.B. Silva & T.S. Cabral
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

Basidioma in young state partially within the substrate, lignicolous, subglobose to acuminated, 7–18 mm diam. Expanded basidioma 23–26 mm diam. exoperidium splitting into 5–6 saccate rays, becoming involute at maturity, not hygroscopic. Mycelial layer papyraceous to felted, brownish orange (KW 5C4) to greyish orange (KW 5B3), persistent, sometimes encrusted with debris, hyphae treads 1.2–3.4 µm diam. Fibrous layer leathery, white to yellowish white (KW 4A2), composed by sinuous hyphae, 2.3–5.1 µm in diameter. Pseudoparenchymatous layer thick, pale yellow (KW 4A3) when fresh, brownish orange (KW 5C3) when dry. Pseudoparenchymatous layer composed by cellular hyphae, subglobose to pyriform, 30–60 µm × 27–46 µm diam. endoperidial body 10–12 × 10–13 mm diam., subglobose, sessile, glabrous, brownish beige (KW 6E3) to brown (KW 6E4). Apophysis absent. peristome mammiform, fibrillose becoming lacerated with age. Columella brownish orange (5C4), club-shaped in cross section. Gleba brown (7F4). Basidiospores globose, 3.5 × 5.1 µm, [x = 3.0 ±0.4 X 3.0 ± 0.4 µm, Qm = 1.0, n = 20], ornamented, under SEM the ornamentation with short verrucae, yellowish brown in 5% KOH. eucapillitium 3.8-6.4 µm diam., casually adhered with amorphous matter, without pores, without septum, yellowish in 5% KOH. Mycelial layer composed of thin sinuous-walled hyphae, lumen absent, 1.2-3.4 µm diam., yellowish in 5% KOH. Fibrous layer composed of thin walled hyphae, 2.3-5.1 µm diam., greenish in 5% KOH. Pseudoparenchymatous layer composed of subglobose to pyriformis hyphae, 30.7-61.4 µm diam. × 26.8-46.0 µm in length, thick-walled, hyaline in 5% KOH

Why suggested for a Global Red List Assessment?

The species is known from South and Central, but with few records. We, thus, suggest this species to be categorized as Near Threatened (NT).

Geographic range

Known from tropical America, Brazil and Costa Rica.

Population and Trends

There are 3 records of this species from Brazil (3) and Costa Rica (1) (based on literature and recent collections).

Population Trend: Uncertain

Habitat and Ecology

Growing on decaying wood. In Brazil, it is known from the Atlantic Forest (Northeastern Brazil).

Subtropical/Tropical Moist Lowland ForestSubtropical/Tropical Moist Montane Forest


Few records in the neotropics. In Brazil, it is found in the Atlantic Forest, a hotspot.

Housing & urban areasCommercial & industrial areasTourism & recreation areasAgro-industry farmingAgro-industry plantationsRoads & railroads

Conservation Actions

Reports in Brazil are from protected area.

Site/area protection

Research needed

More collections.

Population size, distribution & trends

Use and Trade




Country occurrence

Regional Population and Trends

Country Trend Redlisted