Compared to continental Antarctica, the lichen biota of the various subantarctic islands and island groups is poorly documented. Here we describe the new species Lecanora muscigena Øvstedal & Fryday from the subantarctic island of South Georgia from a collection made in 1980 that was previously included as Trapeliopsis sp. A. by Øvstedal & Lewis Smith in their comprehensive account of the Lichens of Antarctica and South Georgia. It is similar to Lecidea globulispora Nyl., which occurs on the nearby Falkland Islands, in having globose ascospores but is clearly distinguished from that species by having a well-developed, creamy-white thallus composed of ±dispersed areoles with effigurate margins containing fumarprotocetraric acid, larger ascospores (c. 7–8 µm diam.) and by its habitat of overgrowing terricolous bryophytes. The new species belongs in the Lecanora fuscescens group, the species of which were usually described in the genus Lecidea due to their poorly developed thalline margin. This group is not congeneric with the type species of Lecanora (L. subfusca (L.) Ach.) but we refrain from erecting a new genus for the group pending a full molecular investigation of its delimitation and systematic position.

与南极洲大陆相比，南亚各岛和各岛群的地衣生物区系文献很少。在这里，我们描述了南乔治亚亚南极岛屿的新物种Lecanora muscigenaØvstedal＆Fryday，该物种来自1980年制造的收藏，该收藏以前被称为Trapeliopsis sp。Øvstedal和Lewis Smith撰写的A.关于南极和南乔治亚州地衣的综合报道。它类似于Lecidea globulispora发生在附近的福克兰群岛上的Nyl。具有球形的子囊孢子，但与该物种的明显区别是具有发育良好的乳白色白th，其由±分散的小孔组成，其边缘有富马原曲酸，较大的子囊孢子（c。直径为7–8 µm。）以及其栖息的陆生苔藓植物的栖息地。新物种属于Lecanora fuscescens组，由于其th线边缘发育不良，因此通常在Lecidea属中进行描述。这一组与Lecanora（L.subfusca （L.）Ach。），但我们不为该组别建立一个新属，以待对该类的界定和系统位置进行全面的分子研究。