Anzia centrifuga 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Fungi Ascomycota Lecanoromycetes Lecanorales Parmeliaceae

Scientific Name: Anzia centrifuga Haugan
Taxonomic Source(s): Haugan, R. 1992. Anzia centrifuga, a new lichen species from Porto Santo, Madeira. Mycotaxon 44(1): 45-50.
Taxonomic Notes: The species is easy to recognize in the field by specialist lichenologists. The species' taxonomy is well defined and it is the only species of this genus in Macaronesia. The species grows over rocks, is adnate to loosely attached to the substrate. The thallus is orbicular up to 30 cm in diameter, dying at the center of the thallus; the colour is pale grey. The thallus has numerous apothecia. Lobes are 1-2 mm wide, dichotomously branched, more or less imbricate, lobe tips showing calcium oxalate deposits. The medulla has a chondroid axis. The lower side is with a felt like layer of short rhizines characteristic of this genus. Secondary metabolites include atranorin and several unknown terpenoids.

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2014
Date Assessed: 2014-08-07
Assessor(s): Aptroot, A., Perez-Ortega, S & Scheidegger, C.
Reviewer(s): Dahlberg, A. & Nimis, P.L.
This species occurs only with two small subpopulations on one volcano. It is threatened by accidental extinction from trampling, grazing and possibly collecting.
Criterion A:  There are no reports about the trends of population size over long time periods, so it is not possible to apply this criterion.
Criterion B: Both B1 and B2 could be applied as the extent of occurrence (EOO) is 10 km2 and the area of occupancy (AOO) is 1 km2. However, the species does not fit the condition of also meeting two subcriteria. It only fits B1a or B2a as there is a single location. However no information is available regarding continuing declines and extreme fluctuations.
Criterion C: No information is available about the total number of individuals of this species. Thus, subcriteria C1 and C2 are not applicable. 
Criterion D: The total number of individuals is unknown but the area of occupancy (AOO) is smaller than 20 km2 and the number of locations is one. Development of tourism is a plausible threat to this species. Therefore, it qualifies for Vulnerable D2.
Criterion E: No quantitative analyses have been carried out.
The species is assessed as VU D2 until more research on the species, particularly the population size, is carried out.

Geographic Range [top]

Range Description:This species occurs only with two small subpopulations on one volcano on Porto Santo (Madeira, Portugal).
Countries occurrence:
Portugal (Madeira)
Additional data:
Estimated area of occupancy (AOO) - km2:1Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:10
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:1Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:UnknownLower elevation limit (metres):430
Upper elevation limit (metres):517
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The species is restricted to one locality on a volcano. The species was found on two rock surfaces. Population size was not assessed.
Current Population Trend:Unknown
Additional data:
Continuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes

Habitat and Ecology [top]

Habitat and Ecology:Anzia centrifuga grows on well illuminated rocks together with various crustose lichens.

Use and Trade [top]

Use and Trade: Possibly collected for scientific investigations

Threats [top]

Major Threat(s): This species occurs only with two small subpopulations on one volcano. It could be threatened by accidental extinction from tourism, fire, trampling, grazing and possibly collecting if development of tourism occurred in the vicinity of the population. The past impact of these threats has not been documented. There is a road in to the locality and if this is not changed then the impact of these threats is likely to remain negligible. However, expansion of this road for development for tourism would result in the habitat becoming heavily disturbed and degraded. This is therefore a plausible threat to the species.

Conservation Actions [top]

Conservation Actions: No conservation plan is available. There is an urgent need for a detailed assessment of population size, the extent of occurrence and trend.

Citation: Aptroot, A., Perez-Ortega, S & Scheidegger, C. 2014. Anzia centrifuga. The IUCN Red List of Threatened Species 2014: e.T64081145A64081186. . Downloaded on 17 August 2018.
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