Hypogymnia arcuata and H-sachalinensis, two new lichens from east Asia

Hypogymnia arcuata and H. sachalinensis are described as new species of lic henized fungi from east Asia (Russia, China, and Japan). Closely related to H. fragillima, H. arcuata is separated from that species by the less frequ ently confluent holes in the lower surface, more broadly divergent branchin g, and the presence of 2'-o-methylphysodic and 3-hydroxyphysodic acids by T LC. Formerly confused with the North American endemic H. duplicata, H. arcu ata lacks the long, cascading lobes and physodalic and protocetraric acids of H. duplicata. Hypogymnia sachalinensis has long been confused with the N orth American endemic H. enteromorpha under the name H. enteromorpha var. i nactiva Hypogymnia sachalinensis is smaller than H. enteromorpha, with appr essed to imbricate, narrower lobes. Hypogymnia enteromorpha is unknown from Asia.