• Proposed
  • Under Assessment
  • ENPreliminary Assessed
  • 4Assessed
  • 5Published

Macrocystidia reducta E. Horak & Capellano

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Scientific name
Macrocystidia reducta
E. Horak & Capellano
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Assessed
Preliminary Category
Proposed by
Jerry Cooper
Jerry Cooper
Jerry Cooper

Assessment Notes


Estimated number of mature individual 135 with the largest sub-population much less than this.

Taxonomic notes

Macrocystidia reducta is a distinct secotioid species with a fishy odour.  It is a member of a saprophytic mushroom family with few species globally and the family phylogenetically isolated within the order. The species is sequence barcoded.

Why suggested for a Global Red List Assessment?

A distinct secotioid species with a fishy odour restricted to a small geographic areas with sites under pressure from land-use change.

Preliminary Category: Endangered. C2ai (MI < 250), or Endangered D1 (MI < 250)

Geographic range

Population and Trends

This mushroom has been systematically surveyed in suitable habitats in the known area for 18 years. In addition many suitable habitats in other parts of New Zealand have been surveyed and the species not found. The species is perhaps the best surveyed uncommon species in New Zealand and the known sites represent the area of occurrence with a high degree of certainty. It is known from 18 locations. We infer the presence of 18 locations/genotypes, x 1.5 to account for undetected colonies, x 5 to convert to an estimate of 135 mature individuals. Extent of Occurrence 420 km2, Area of Occupancy 68 km2

Population Trend:

Habitat and Ecology

Macrocystidia reducta is restricted to the Banks Peninsula area of New Zealand where it occurs in a few remaining podocarp remnants. It is a secotioid (pouch) fungus with limited ability to disperse spores and it is likely that animals (possibly exitnct) play a critical role in dispersal.


The habitat of the species in the known area has decreased substantially historically, and whilst some areas have some level of protection, many do not and the available habitat is likely to contract in the future and/or be impacted by adjacent land-use change and alien invasive species. The known locations are in areas with less than 10% of indigenous cover remaining and all in forest fragments surrounded by exotic grass pasture.

Conservation Actions

Research needed

The mode of dispersal needs investigation to ascertain if dispersal animals are still extant.

Use and Trade


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted