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Leptonia carnea 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Fungi Basidiomycota Agaricomycetes Agaricales Entolomataceae

Scientific Name: Leptonia carnea
Species Authority: Largent

Assessment Information [top]

Red List Category & Criteria: Vulnerable C2a(i) ver 3.1
Year Published: 2015
Date Assessed: 2015-06-10
Assessor(s): Vellinga, E.
Reviewer(s): Dahlberg, A.
Justification:
This beautiful species is restricted to the Coast Redwood forests of California, USA, which have come under severe drought stress because of changing summer fog patterns, and reduced winter rains. The Coast Redwood (Sequoia sempervirens) is endemic to coastal areas of California and utmost southern Oregon, and has been, is and will continue to be subject to logging, resulting in patchiness and fragmentation of suitable habitat. Leptonia carnea is assessed as Vulnerable (VU) under criterion C2a(i), because of less than 2,500 mature individuals and continuing decline in habitat extent.

Geographic Range [top]

Range Description:Endemic to the United States occurring in northern coastal California from Humboldt County in the north into Monterey County, with one observation from Washington State that has to be confirmed (Largent 1977, 1994).
Countries occurrence:
Native:
United States (California)
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Known from a small number of localities in the counties of Humboldt, Mendocino, Sonoma, Marin, Santa Cruz and Monterey. In total probably less than 50 localities are known.

Restricted to Sequoia sempervirens forests. These forests have been extensively logged during the last century, and continue to be logged, resulting in severe habitat loss. Today, only five percent of the original old-growth Coast Redwood forest remains, along a 450-mile coastal strip in California (http://www.savetheredwoods.org/redwoods/coast-redwoods/).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:2500Continuing decline of mature individuals:Yes
No. of subpopulations:49Continuing decline in subpopulations:Yes
All individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:A terrestrial fungus with unknown nutritional status growing in Sequoia sempervirens forests. There is one record from a Cupressus macrocarpa stand, and one observation outside the occurrence of Sequoia sempervirens in Washington State (but this still has to be confirmed). Often found in slightly disturbed sites.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: The species is not known to be used.

Threats [top]

Major Threat(s): Habitat changes and habitat destruction as a result of two major impacts: logging of coastal redwood forests that has been going on for a century (Noss 2000), and the changes in the remnants of these forests due to decreased summer fog (Johnstone and Dawson 2010) and irregular winter rains, which are the cause of increased drought stress on the trees.

Conservation Actions [top]

Conservation Actions: The following actions are needed:
  • Protection of the existing Sequoia sempervirens forests from logging
  • Curbing of carbon emissions.

Errata [top]

Errata reason: The name of the Assessor has been corrected to include all of their initials.

Citation: Vellinga, E. 2015. Leptonia carnea. (errata version published in 2016) The IUCN Red List of Threatened Species 2015: e.T76256454A97168155. . Downloaded on 25 May 2017.
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