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Two new species of nivicolous Lamproderma (Myxomycetes) from the mountains of Europe and America

     ¹ Mycology, Institute of Botany, Polish Academy of Sciences, Lubicz 46, Kraków, Poland, 31-512, Poland
² Mycology, Real Jardín Botánico, CSIC, Plaza de Murillo, 2, Madrid, 28014, Spain
³ Le Bayet, 73730 Rognaix, Rognaix, France
⁴ Mycology, Real Jardín Botánico (CSIC), Madrid, SPAIN, 28014, Spain

As a result of the revision of European and American collections of the genus Lamproderma, two new nivicolous myxomycete species, Lamproderma argenteobrunneum and L. kowalskii, are described. The new species are characterized by the silvery-brown sporothecae, the areolate peridium and the ferrugineus-brown color of the spores in mass. They differ from one another mainly in spore size and ornamentation, the form of the capillitium and the stalk length and ratio of the stalk length to the total height of the sporocarp. The morphology of the new species was examined with light microscopy and scanning electron microscopy (SEM), and micrographs of relevant details are included. Lamproderma argenteobrunneum was also obtained in moist chamber culture, and the mature sporocarps displayed all the typical features of the field-collected samples. The known geographical distribution of L. argenteobrunneum includes the main mountain ranges of the European Alpine System (Alps, Carpathians, Pyrenees) as well as mountains of North America, while L. kowalskii has been recorded so far from several sites in California in the United States.

Key words: Lamproderma fuscatum, moist chamber culture, Mycetozoa, Myxogastria, Protozoa