• Proposed
  • Under Assessment
  • Preliminary Assessed
  • CRAssessed
  • Published

Stilbohypoxylon macrosporum Hladki & A.I. Romero

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Scientific name
Stilbohypoxylon macrosporum
Hladki & A.I. Romero
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Assessment status
Proposed by
Francisco Kuhar
Francisco Kuhar, Donald Pfister, Camille Truong
Comments etc.
Anders Dahlberg, James Westrip
David Minter

Assessment Notes


This species is only known from forest in the southern Yungas of Argentina, but research needs to be done to see whether it is present in Bolivia too. This habitat is deteriorating outside of reserves, and the population is thought to be in decline. Overall the population size is thought to be small (c.160 mature individuals), and so the species is listed as Critically Endangered under criterion C2a(ii).

Taxonomic notes

Why suggested for a Global Red List Assessment?

This is a rare species probably endemic from the southern Yungas forests in Northern Argentina (Tucumán Province) a highly fragmented environment with empoverished forest structure due tu the citrics and sugarcane cultures

Geographic range

This species occurs in the southern Yungas including the provinces of Tucuman, Salta and Jujuy. It could occur in Bolivia, but there is much uncertainty about this.

Population and Trends

Only one collection has been made after the original publication. The species is rare and it seems to be limited to the southernmost part of these forests. The remaining areas of these forests are impoverished but now preserved from intensive agriculture so they constitute a safe environment for this and other fungi. However, some activities related to cattle have been noted to damage the lower levels of vegetation where this species was found. Since the reserves in the area have a high conservation status, we suppose that the numbers in reserves are stable, but forest outside of the reserves is in danger and decreasing. The species occurs at low frequency where it has been studied, and scaling up to take account of other areas of suitable habitat where the species may occur would give a population size of 160 mature individuals.

Population Trend: Decreasing

Habitat and Ecology

No specific associated plant has been determined since the indications in the original papers are limited to dicotyledon wood (see Hladki and Romero 2003). As for the other members of the order Xylariales, this genus is a wood degrader probably causing a limited white rot. Both anamorph and teleomorph coexist in the same stromatic structures and are involved in the life cycle on the woody substrate.

Subtropical/Tropical Dry Forest


This species is threatened by the reduction of the native environment and fragmentation of the forest by activities such as citrus or sugar cane culture.

Agro-industry farming

Conservation Actions

The areas in the province where this species occurs are now strongly protected from human activities, with multiple protected areas within its potential range (e.g. Los Diques Provincial Reserve, Reserva Natural Finca Las Costas, Las Yungas Biosphere Reserve). However, no specific actions are being undertaken for organisms other than vertebrates and timber species. More initiatives (including political actions) ensuring interconnection of the the patchy distribution of these forests are needed, in particular preventing the spread of agriculture into forest areas.

Resource & habitat protectionHabitat & natural process restorationSub-national level

Research needed

Studies of the substrate specificity and states of degradation where this and other species occur would be useful. These could be used in order to identify the availability of such resources throughout the patchy distribution of forests in this region. Its presence in Bolivia also needs to be confirmed (E. Sir pers. comm.).

Population size, distribution & trendsLife history & ecology

Use and Trade

No uses are recorded.


Sir, E.B., Hladki, A. I., Parrado, M. F. and Romero, A. I. (2012). Biodiversity of Xylariaceae (Ascomycota) and their hosts in protected areas from Tucuman (Argentina): Biodiversidad de la familia Xylariaceae (Ascomycota) y sus hospedantes en áreas protegidas de Tucumán (Argentina). Kurtziana, 37(2), 35-48.

Blundo, C. and Malizia, L. R. (2009). Impacto del aprovechamiento forestal en la estructura y diversidad de la Selva Pedemontana. En: Selva pedemontana de las Yungas, historia natural, ecología y manejo de un ecosistema en peligro. Brown, A.D., Blendinger, P.G., Lomáscolo, T. and García Bes, P.(Eds.), 387-406.

Hladki, A. I. and Romero, A. I. (2003). Two new species of Stilbohypoxylon and the taxonomic positions of Hypoxylon cyclopicum, H. chionostomum and Anthostoma chionostoma. Sydowia, 55(1), 65-76.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted