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

Mycosphaerella coussapoae F.B. Rocha & R.W. Barreto

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Scientific name
Mycosphaerella coussapoae
F.B. Rocha & R.W. Barreto
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Assessment status
Proposed by
Fabiano Branco Rocha
Comments etc.
Fabiano Branco Rocha
Gregory Mueller

Assessment Notes

Taxonomic notes

Mycosphaerella coussapoae F.B. Rocha & R.W. Barreto, Mycologia 102(6): 1243 (2010).

Why suggested for a Global Red List Assessment?

Mycosphaerella coussapoae inhabits a rare host (Coussapoa floccosa) present only in primary forests.

Geographic range

Mycospherella coussapoae is a phytopathogenic fungus found associated only with living leaves of Coussapoa floccosa (ROCHA, 2010), a rare plant species found only in primary tropical forests, mainly in the Atlantic Forest of Southeastern Brazil (GASTAUER; LEYH; MEIRA-NETO, 2015; PEREIRA; AL., 1998). As no other host is known for this fungus, its geographic distribution is inferred to be the restricted location of its host. Coussapoa floccosa is listed as VU B1+2ab (IUCN Red List 2021-2). Surveys for Mycosphaerella coussapoae has ccurred only in Southeastern Brazil, where they were found on all individuals of Coussapoa in the sites, so the inference considered that this fungus also occurs in the Amazon region. Furthermore, its host is only found in primary forests (GASTAUER; LEYH; MEIRA-NETO, 2015) evidencing the importance of the loss of habitat quality in the conserving status.

Population and Trends

Although it is not possible to estimate the population size, it is remarkable that populations are fragmented due to geographic separation, mainly due to the presence of valleys and mountains. Furthermore, the subpopulations fluctuate as hosts shed their leaves annually. Apparently, the population trend is stagnant, but with a risk of decline owing to loss of habitat quality.

Population Trend: Stable

Habitat and Ecology

Mycosphaerella coussapoae occurs in lesions found on live leaves of a rare plant species, (Coussapoa floccosa). The Mycosphaerellaceae is typically plant pathogens that cause localized lesions on leaves, which are not associated with other tissues of their hosts. Furthermore, most species have some level of specificity with their hosts (CROUS, 2009). About this species, its rare host individuals were only found naturally in fragments of primary forest in the Atlantic Forest. Mycosphaerella coussapoae may fluctuate annually in its population, as its host is deciduous, and diseases caused by the fungus do not appear on young leaves.


The fact that its host is an endangered plant species can bring the extinction of Mycosphaerella coussapoae into a co-extinction effect due to its specificity relationship. Along with this, the loss of habitat quality is also a concern since this species was only found in fragments of primary forest of the Brazilian Atlantic Forest. Another important threat is related to climate change that can interfere in the life cycle of plant pathogens as well (BURDON; ZHAN, 2020).

Unintentional effects (species being assessed is not the target)Unintentional effects: subsistence/small scale (species being assessed is not the target) [harvest]

Conservation Actions

Recognize all areas where the host can be found as an area of permanent protection. Expansion of areas vegetated by native forests. Creation of a host recovery program through planting seedlings.

Site/area protectionResource & habitat protection

Research needed

It is necessary to carry out studies that better identify the geographic distribution of your host.

Population size, distribution & trendsSpecies Action/Recovery PlanArea-based Management Plan

Use and Trade

There is no traditional or commercial use associated with this species.


Country occurrence

Regional Population and Trends

Country Trend Redlisted