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

Microglossum rickii S. Imai

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Scientific name
Microglossum rickii
S. Imai
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Assessment status
Preliminary Assessed
Preliminary Category
Proposed by
E. Ricardo Drechsler-Santos
Comments etc.
E. Ricardo Drechsler-Santos, Gregory Mueller

Assessment Notes


Microglossum rickii is only known from the type specimen, collected in 1931.

Taxonomic notes

Microglossum rickii Imai was described for Sanshi Imai in 1942 (Imai 1942) based on a collection named Geoglossum viride, collected by Johannes Rick in 1931 in Nova Petropolis, Rio Grande do Sul state (Rick 1931). This collection was first recorded in Broteria ser. Bot. XXV 73.

Why suggested for a Global Red List Assessment?

This is a very rare species, having been recorded for only one collection from 1931 since it has been described. Additionally, the region where this species occurs, in Nova Petropolis, Rio Grande do Sul state, southern Brazil is very touristic, has a strong real estate speculation, and belongs to Mixed Ombrophilous Forest, one of the most reduced formations in Atlantic Forest, with about 13% of its original cover. The species is assessed as Critically Endangered under criteria B1 + B2a,b(i,ii,iii) + C2a(i) + D, with an inferred population of 2 mature individuals, and very small AOO and EOO (4 km²).

Geographic range

Currently known only for the type locality. The limited data indicates that the collection is from Nova Petropolis, in Rio Grande do Sul state, southern Brazil, “in graminosis inter arbusta”, suggesting that its habitat is a shrubby-like vegetation.

Population and Trends

The species was first recorded in 1931 in Rio Grande do Sul and was never more collected. It is currently not possible to estimate its range or population size.

Population Trend: Uncertain

Habitat and Ecology

The scarce information on the label of the collection suggest that this species grows on shrub-like vegetation. As other species of Microglossum, this species grows on moist soil.

Subtropical/Tropical Moist Lowland ForestSubtropical/Tropical Moist Shrubland


The habitat of this species, the Mixed Ombrophilous Forest, was historically deforested, to about 13% of its original size (Ribeiro et al. 2009). The remaining fragments are generally very small and under several kinds of anthropogenic pressures (Vibrans et al. 2011). Additionally, Nova Petropolis belongs to a very touristic region, that is under continued development.

Housing & urban areasTourism & recreation areasOther ecosystem modifications

Conservation Actions


Awareness & communications

Research needed

Surveys areas near the type locality and similar localities are needed to identify the populations of this species. There are possible herbarium records of Rick housed at FH that need to be studied.

Population size, distribution & trends

Use and Trade

Not known.


Imai S. 1942. Contributiones ad studia monographica Geoglossacearum. Botanical Magazine, Tokyo 56:523–527.

Rezende, C.L., Scarano, F.R., Assad, E.D., Joly, C.A., Metzger, J.P., Strassburg, B.B.N., Tabarelli, M., Fonseca, G.A., Mittermeier, R. A. (2018) From hotspot to hopespot: An opportunity for the Brazilian Atlantic Forest. Perspectives in Ecology and Conservation. doi:10.1016/j.pecon.2018.10.002

Ribeiro, M.C., Metzger, J.P., Martensen, A.C., Ponzoni, F.J. and Hirota, M.M. 2009 The Brazilian Atlantic Forest: how much is left, and how is the remaining forest distributed? Implications for conservation. Biol. Conserv. 142, 1141–1153.
Rick, J. 1931. Monographia hellvellinearum riograndensium. Brotéria, série Botânica 15: 72–76.
Tabarelli, M., Aguiar, A. V., Ribeiro, M. C., Metzger, J. P., & Peres, C. A. (2010) Prospects for biodiversity conservation in the Atlantic Forest: Lessons from aging human-modified landscapes. Biological Conservation, 143(10), 2328–2340. doi:10.1016/j.biocon.2010.02.005

Vibrans, A.C., Sevegnani, L. and Uhlmann, A. 2011 Structure of mixed ombrophyllous forests with Araucaria angustifolia (Araucariaceae) under external stress in Southern Brazil. Rev. Biol. Trop. 59, et al, 1371–1387.

Country occurrence

Regional Population and Trends

Country Trend Redlisted