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

Chaenothecopsis oregana Rikkinen

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Scientific name
Chaenothecopsis oregana
Common names
Resin Whiskers
IUCN Specialist Group
Assessment status
Proposed by
Jessica Allen
Hayley Paquette
Jessica Allen, Sean Beeching, Giovanna Bishop, Malcolm Hodges, James Lendemer, Troy McMullin, Rebecca Yahr

Assessment Notes


Globally, this species has <250 mature individuals (total of 38 occurrences) and the number of mature individuals in each subpopulation is <50. Due to its’ reliance on mature boreal forests, it is at risk of continuing decline from an already very small known population given the continued decline and fragmentation of mature boreal forests globally. Lichens and allied fungi are slow growing and for this reason loss and fragmentation of habitat, especially for species like the proposed one, directly influences the resilience of the existing populations and can result in irreversible declines.

Taxonomic notes

This species was questioned in 2011 by Tuovila et al., because of issues with the type specimen. Those authors elected to discard the ‘oregana’ name and described instead two new species from the type material (C. diabolica and zebrina). Later, it was found that this was not nomenclaturally possible, and Tuovila et al. (2012) made the correction to reinstate C. oregana, and C. zebrina was synonymized with the it (C. diabolica remains a distinct species). At this time, C. oregana is an accepted species and taxonomically distinct from other allied fungi.

Why suggested for a Global Red List Assessment?

This species relies on old growth forests, specifically growing on the exposed, old resin of Abies, Picea and Tsuga. Its major threat is from logging, which removes its obligate microhabitat (i.e. old, Abies, Picea and Tsuga with exposed, aging resin), which takes a long time to re-grow.

Geographic range

Population and Trends

There are 38 known occurrences of this species globally (Paquette et al. 2019, Rikkinen 2003b). Occurrences reported since its description in 2003 are minimal, for example it was recently reported for the first time in eastern North America from the Acadian Forest Ecoregion by Paquette et al. (2019), despite focussed, long term studies in the area by Selva (2013, 2014….+). The boreal forest (this species’ obligate habitat) in North America is in decline (cite) and globally…?

Population Trend: Decreasing

Habitat and Ecology

Chaenothecopsis oregana grows on the exudate (resin) of old Abies, Picea and Tsuga species (Rikkinen 2003b). It is relatively common in the Pacific Northwest where it


Decline of the boreal forest (logging, urban development, land clearing for industrial development (i.e. mining)).

Conservation Actions

Protection of mature boreal forest for habitat.

Research needed

Further documentation of this species’ range in the boreal forest.

Use and Trade



Known distribution - countries

Regional Population and Trends

Country Trend Redlisted