This bioluminescent fungus is poorly known as the whole region is under-sampled. It is only known from three collections at two sites. There is insufficient information to be able to estimate its population size or trend, EOO or AOO, and it is therefore assessed as Data Deficient.
It is a rare fungi, collected three times at Amazonia. Currently known from a single site near to a protected forest reserve. Mycena lacrimans was described from a single basidiome collected by Singer in 1989. Only in 2005 and 2007 the species was collected again by Dejardin and redescribed from material collected near the type locality.
There are only two records, both from the Amazon region (Manaus, Amazonas - Brazil): Reserva Florestal Ducke (2° 52’ 59.9988’’ S, 59° 58’ 0.0012’’ W) and along federal highway BR-319 near km83 (3° 6’ 6.984’’ S, 60° 1’ 30.0072’’ W and 3° 37’ 12.6984’’ S, 60° 12’ 44.7984’’ W). It is likely to be under-sampled, and it is possible that it also occurs in other countries in the Amazon region.
It is a rare fungus, collected three times from sites in the Amazon. It is currently known from a single site near to a protected forest reserve. Mycena lacrimans was described from a single basidiome collected by Singer in 1989 from Reserva Florestal Ducke. The only further collections are from a second site near the type locality: in 2005 and 2007 the species was collected again by Desjardin and redescribed from material collected there. There is insufficient information to be able to estimate its population size or trend, as so little is known about its distribution due to under-sampling.
Population Trend: Uncertain
This is a bioluminescent fungus. It occurs solitary or scattered on fallen dicotyledonous leaves and small twigs in terra-firme evergreen forest, near water bodies (igapós: flooded forest and igarapés: small creeks) (Desjardin and Braga-Neto 2007).
Due to clearing for agricultural areas, illegal logging, urbanization (expansion of nearby Manaus) and mining, the Amazon has been deforested and burned. According to the Amazon Monitoring Program of INPE (2019) between 2018 and 2019 there was a substantial increase in clearing. Approximately 17% of the original Amazon vegetation has already been cleared.
The first record of this species is from a site currently within a Protected Area, however it has not yet been refound there. The site with the more records, although nearby, is unprotected. Actions which would be beneficial to this species include: resuming and intensifying campaigns to prevent burning; intensifying combating fires; increasing inspection and monitoring of deforestation. Furthermore, the protection of sites and conservation action are essential for the preservation of threatened areas.
More sampling is needed to better understand this species’ distribution. Additionally, taxonomic studies on the group are necessary, due to Mycena lacrimans being a difficult species to place in the infrageneric groups known in Mycena.
Desjardin, D.E. & Braga-Neto, R. - Mycena lacrimans, a rare species from Amazonia, is bioluminescent. Edinburgh Journal of Botany, 64 (3): 275-281.
Singer, R (1989). New taxa and new combinations of Agaricales (Diagnoses Fungorum Novorum Agaricalium IV). Fieldiana: Bot., n.s., 21: 1-133.
Stropp, J et al. (2020). The gosts of forests past and future: deforestation and botanical sampling in the Brazilian Amazon. Ecography 43: 1-11.
INPE (2019). http://www.inpe.br/faq/index.php?pai=6