This species has a seemingly small population and is only regularly observed in its North West South Island locality. The level of recording in New Zealand Nothofagus forests is high so we have some confidence in the population estimates. On the basis of a population of 80 mature individuals and a potential of 20 locations we have concluded that this species is endangered.
Mycena globuliformis Segedin.
A small Mycena that grows on Nothofagus species and can be confused with the more common Mycena interrupta.
Proposed by Pat Leonard. Known from relatively few collections. Possibly sometimes confused with the common Mycena interrupta. Known from 16 collections in 11 locations in both NI and SI. Extent of Occurrence 167,287.406 km2 Area of Occupancy 64.000 km2
Mycena globuliformis has mainly been recorded from the South Island of New Zealand with only two North Island collections.
Mycena globuliformis mainly occurs in small groups on large decaying logs of Nothofagus although there is one reliable record on Dacrydium. There have been 8 collections made in the last 50 years. Following Dahlberg and Mueller’s proposal for saprotrophic fungi growing on logs, we have counted each collection as 2 mature individuals. There are effective four locations for the species: Taupo, Ruahine Forest Park, Abel Tasman National Park and Canterbury. Surprisingly, despite extensive surveys in other Nothofagus dominated forests, this species has not been recorded outside these four locations. None the less we think that we should allow for perhaps 5 times as many sites to accommodate as yet undiscovered locations. This yields a population of 80 distributed over 20 sites. The fact that there have been no collections in North Island for some 35 years hints at decline there.
This species is a saprotrophic fungus that prefers large fallen logs in moist forests. It is mostly restricted to fallen Nothofagus trunks but has been recorded on Dacrydium. Most of the sites are old growth forest with a closed canopy and medium to high rinfall.
Most of the forest locations for this species are relatively secure from land use changes. Climate changes that have recently resulted intense periods of rainfall, storms and droughts have if anything increased the supply of host material for this species. However we suspect that the species may be vulnerable to both intense drought conditions and to higher temperatures.
Recognition of the importance of large old growth logs as hosts for this and other fungal species in Park and Forest management plans would improve the future security of Mycena globuliformis.
Better data on the host requirements and preferences of this species would assist its conservation.
Dahlberg A. and Mueller G.M. (2011) Applying IUCN red-listing criteria for assessing and reporting on the conservation status of fungal species. Fungal Ecology 4: 147-162.
Geospatial Conservation Assessment Tool: geocat.kew.org
Global Biodiversity Information Facility: gbif.org
Manaaki Whenau - Landcare Research databases: https://nzfungi2.landcareresearch.co.nz/
Segedin, B.P. 1991: Studies in the Agaricales of New Zealand: some Mycena species in sections Longisetae, Polyadelpha, Rubromarginatae, Galactopoda, Lactipedes, and Calodontes. New Zealand Journal of Botany 29(1): 43-62.