Three new species of Hypogymnia (Ascomycota: Parmeliaceae) from the Bering Sea region, Alaska, and Russia

摘要

Hypogymnia castanea? and? H. fistulosa? are newly described species of lichenized fungi (Ascomycota: Parmeliaceae), apparently restricted to oceanic tundra in the Bering Sea region.? Hypogymnia castanea? is so far known in Alaska only from the Seward Peninsula; it is also found in far east Russia.? Hypogymnia fistulosa? occurs at numerous localities on the Aleutian Islands, other islands in the Bering Sea, and the Seward Peninsula.? Hypogymnia lugubris? ssp.? beringiana? is elevated to the species level because of numerous morphological, chemical, and geographic differences from? H. lugubris? in the southern Hemisphere.? Hypogymnia beringiana? is a rare species from Alaska and Russia.