• 1Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Gyalectidium colchicum Vězda

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Scientific name
Gyalectidium colchicum
Common names
IUCN Specialist Group
Assessment status
Proposed by
Gennadii Urbanavichus
Gennadii Urbanavichus
Comments etc.
Anders Dahlberg

Assessment Notes

Taxonomic notes

Gyalectidium colchicum Vězda, 1983, Folia Geobot. Phytotax. 18(1): 58.
Type: U.R.S.S. Rossia merid., Colchis (Transcaucasia occid.), distr. Lazarevskoje: in faucibus rivi Dagomys Zapadnyi, supra vicum Tretja Rota [Tret’ya Rota]. [WGS 84: 43.7419, 39.6814]. Ad folia Buxi colchicae. 1979/6/25 Vězda, A.

Why suggested for a Global Red List Assessment?

Gyalectidium colchicum, is in a state of regression throughout the Black Sea coast region due to anthropogenic pressure, mainly the development of tourism, deforestation, the construction of Olympic facilities in Sochi 2014. Species is strictly associated with old-grown evergreen forests in Caucasus and Macronesia. It has been red-listed VU B1b(iii) in Russia (Krasnodar Area) because its distribution area is fragmented and some populations have disappeared given the loss of their natural habitat (Urbanavichus, 2006). According to monitoring, the Black Sea population has a rapid declined during 2012-2013.

Geographic range

It has been known only from the western part of the Caucasus (Russia, Abkhazia, Georgia), adjacent areas of the Black Sea coast of Turkey (Trabzon and Rize provinces) and Macaronesia (Portugal - Azores: Terceira and São Miguel; Madeira; Spain - Canary Islands: Gomera and La Palma)

Population and Trends

Russia: the Black Sea coast of Krasnodar Area, W Caucasus (Vězda, 1983; Urbanavichus, 2006). Caucasian population rapidly declined.
Turkey: Trabzon and Rize provinces (Aslan et al., 2005). Unknown population trend.
Portugal: Azores (Terceira and São Miguel), Madeira. Unknown population trend.
Spain: Canary Islands (Gomera and La Palma). Unknown population trend.

Population Trend: Decreasing

Habitat and Ecology

It is foliicolous species prefer to grow on leaves evergreen trees and shrubs (Buxus colchica and Laurocerasus officinalis in the Black Sea coast and Laurus azorica in Macaronesia). Species is strictly associated with virgin wet Buxus forests (the Black Sea coast from Russia to Turkey) and old-grown mountain cloud forests (Macaronesia) with numerous relicts species.


It is threatened by habitat loss caused by a catastrophic defoliation of Buxus trees, forestry (legal and illegal logging), road development, the construction of Olympic facilities in Sochi 2014, and climate change.

Commercial & industrial areasTourism & recreation areasRoads & railroadsUnintentional effects: subsistence/small scale (species being assessed is not the target) [harvest]Recreational activitiesDiseases of unknown causeTemperature extremes

Conservation Actions

Research needed

Study of population trends are needed across its distributional range. Response to climate change and habitat loss have to be studied.

Population size, distribution & trendsThreatsHabitat trends

Use and Trade


Aslan, A., Vězda, A., Yazici, K., Karagoz, Y. 2005: New foliicolous lichen records for lichen flora of Turkey. - Cryptogamie, Mycologie 26(1): 61-66.
Ferraro, L.I., Lücking, R., Sérusiaux, E. 2001: A world monograph of the lichen genus Gyalectidium (Gomphillaceae). - Botanical Journal of the Linnean Society 137: 311-345.
Urbanavichus, G. P., Urbanavichene, I. N. 2012: Addition to the lichen flora of Abkhazia and Caucasus. – Vestnik Tver State University. Ser. Biology and Ecoligy. 27: 109-116.
Vězda, A. 1983: Foliicole Flechten aus der Kolchis (West-Transkaukasien, UdSSR). - Folia Geobotanica et Phytotaxonomica 18: 45-70.
Urbanavichus, G. P. Gyalectidium colchicum – In: Red Data Book of Krasnodar Area. Krasnodar: 385.

Country occurrence

Regional Population and Trends

Country Trend Redlisted