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  • Under Assessment
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Marthanella nidulosa States & Fogel

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Scientific name
Marthanella nidulosa
States & Fogel
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Incertae sedis
Assessment status
Under Assessment
Proposed by
Catia Canteiro
Susana P. Cunha, Susana C. Gonçalves
Comments etc.
Catia Canteiro

Assessment Notes

GBIF.org shows a location within Grand Canyon National Park that does not match the “Oak Creek Canyon near Indian Gardens"description from States and Fogel (1999) or herbarium label. It was likely attributed the wrong coordinates in GBIF, due to a mix up between two locations with the name “Indian Gardens”.


Marthanella nidulosa is a gasteroid species known from 3 close sites in North America, recorded between 1981 and 1995. It is possible this species may have a small and restricted population, and therefore apply for a threatened category, but it may also be considerably under-recorded due to its hypogeous and inconspicuous nature. In addition, it has a large area of potentially appropriate habitat and range of putative hosts, so area of distribution and population size may be much larger. Targeted search efforts and more research into habitat preference are needed so the species is assessed as Data Deficient (DD).

Taxonomic notes

Type species of the monotypic genus Marthanella, established based on morphological evidence (States and Fogel, 1999). No synonyms.

Why suggested for a Global Red List Assessment?

Geographic range

Only known from North America (Coconino and Hila County in Arizona, USA) (States and Fogel, 1999).

Population and Trends

M. nidulosa is only known from its description, from collections made between 1981 and 1995 in 3 close sites in Arizona. Since it is a small, hypogeous and therefore inconspicuous fungus, with several potential hosts, the number of unknown sites is expected to be higher. Nevertheless, since no putative host relationships have been confirmed and known area of distribution is considerably small, it is difficult to estimate population size without more records or search efforts.
There is no evidence of population decline.

Population Trend: Uncertain

Habitat and Ecology

Hypogeous gasteroid species, thought to be mycorrhizal. Found in mixed deciduous and conifer forests, so far under a combination of Quercus chrysolepis, Quercus gambelli, Pinus ponderosa and Pinus edulis (States and Fogel, 1999, UM Herbarium Data Group and IPT Admin L, 2022).

Temperate Forest


No major threats have been identified in the known distribution of the species. However, urbanisation, agricultural development, droughts, fire suppression and accumulation of fuel loads, and logging have been identified as threats for some of M. nidulosa’s putative hosts (Beckman, 2016a, Farjon, 2013a, 2013b) and could present a threat to this species in other potential locations.

Housing & urban areasAgro-industry grazing, ranching or farmingUnintentional effects (species being assessed is not the target)Suppression in fire frequency/intensity

Conservation Actions

Two known sites for this species are within the Coconino National Forest and thought to be protected. Its putative hosts Quercus chrysolepis, Quercus gambelli, Pinus ponderosa and Pinus edulis have also been assessed by the IUCN Red List of Threatened Species as Least Concern (Beckman, 2016a, 2016b, Farjon, 2013a, 2013b).

Research needed

Targeted search efforts in areas of appropriate habitat and research into habitat and host preference for this species are needed to estimate population size and potential distribution. Molecular studies to confirm placement of this species in a monotypic genus are also recommended.

TaxonomyPopulation size, distribution & trendsLife history & ecologyThreats

Use and Trade


Country occurrence

Regional Population and Trends

Country Trend Redlisted