Menegazzia inactiva

Menegazzia inactiva has only been found in western Tasmania and the South Island of New Zealand.^[6] This lichen was originally collected from Tasmannia lanceolata in rainforest at an elevation of 170 m.^[4] It is found in cool temperate rainforest, wet eucalypt forest and wet scrub at low altitudes. It grows on twigs and smooth-barked branches of a number of tree species including Lagarostrobos franklinii,^[7] Phyllocladus aspleniifolius^[8] and Nothofagus menziesii.^[9]

Menegazzia inactiva was locally abundant at the type locality when it was first collected in 1980, but the area was logged during the 1980s and it has not been found in the area since. Although it has been found in other locations since, it is uncommon and localised, and only small, fragmentary thalli have been found.^[4]

This lichen was first added to the list of New Zealand's threatened species in 2012 with the classification "Nationally Critical" and the qualifiers "Data Poor", "One Location" and Threatened Overseas".^[10] It was listed on the basis of its very small population size but there were no active threats.^[10] In November 2018 the New Zealand Department of Conservation classified M. inactiva as "Nationally Critical" with the qualifiers "Data Poor" and "Threatened Overseas" under the New Zealand Threat Classification System.^[1] It met the criteria for "Nationally Critical" on the basis there being a single New Zealand population with a total area of occupancy of less than 10 ha.^[1]