Åtgärdsprogram för bevarande av öländsk tegellav (Psora vallesiaca).
- Botanical collections
grows in a small population of about 30 individuals. In the spring of 2006,
four new localities were discovered on Gotland. The main distribution of
Psora vallesiaca streches from the Mediterranean to the steppes of central
Asia. The species usually occurs sparsely but is locally common in Italy and
central Spain. The Swedish populations represent outpost populations. Other
isolated populations occur in Norway, Greenland and in Northern Canada.
Psora vallesiaca grows on calcareous rocks or calcareous soil and appears
to grow in a stable environment with a well-developed lichen flora. It reproduces sexually through spores which are produced in fruiting bodies. These occur frequently in the species and most of the individuals in the population on Öland are fertile. The locality on Öland is situated on the Great Alvar, close to Gösslunda in Hulterstad parish. It was discovered in 1970 and the population was surveyed in 1993 and 2004. The population has remained stable or possibly increased somewhat, and is found in two subpopulations c. 50 meters apart. It is currently growing on a total of eight rocks. Efforts have been made to find the species in other parts of the Great Alvar without results. There is so far no information from the populations on Gotland. The species seems to be able to establish in other localities only with difficulty, but its habitat requirements are not fully understood and there may be further localities also in other types of habitats.
To ensure the survival of the species in Sweden, the number of localities
must increase substantially. The action plan is focussed on a survey of the
species in Sweden to determine the status and increase the knowledge about
population size and the ecology of the species. A second step is to strengthen the known populations and to assemble knowledge about how to spread the species to other localities. The necessities of these actions depends, however, on the results of the surveys. On the current localities more colonizing surfaces can be created by uncovering rocks from vegetation and soil, or by transporting rocks from other localities. The population will be monitored regularly and the activity evaluated no later than 2012. Different techniques for transplantation and dispersal will be tested and evaluated by using other species with a similar morphology and ecology, e.g., Acarospora cervina and Mycobilimbia lurida. If the research activity is successful, transplantations or dispersal methods will be performed with Psora vallesiaca. The goal of the action plan is that at least five new localities exists by 2012. The action plan should be regarded as a document of guidance and not as legally binding. The costs for the action plan is estimated to c. 27 000 Euro.
- ISSN: 0282-7298
- ISBN: 91-620-5673-5