Physma
radians
Physma radians Vainio
Physma radians is a medium-sized foliose lichen grown on tree trunks. It can be distinguished from allied species by radiating lobes with conspicuous wrinkles on the upper surface, the brown lower surface with sparse rhizines, the paraplectenchymatous upper cortex of lobes, the lecanorine apothecia with nitid brown discs, colorless single ascospores and by the absence of chemical substances.
In Japan, it is considered to be a rare species growing in south Kii Peninsula, south Shikoku and south Kyushu and Ryukyu. With felling of evergreen trees, its habitat will probably recede further.
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