Two new Inosperma (Inocybaceae) species with unexpected muscarine contents from tropical China

An accurate identification of poisonous mushrooms and the confirmation of the toxins involved are both of great importance in the treatment of mushroom poisoning incidents. In recent years, cases of mush-room poisoning by Inosperma spp. have been repeatedly reported from tropical Asia. It is urgent to know the real species diversity of Inosperma in this region. In the present study, we proposed two new Inosperma species from tropical Asia, namely I. muscarium and I. hainanense. They were described based on mor-phology and multilocus phylogeny. Detailed descriptions, color photographs and the discussion with other closely related species of the two new taxa were provided. In addition, a comprehensive muscarine determination of these two new species using ultrahigh performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) approach has been performed. Results showed that these two species were muscarine positive, with a content of 16.03 +/- 1.23 g/kg in I. muscarium and a content of 11.87 +/- 3.02 g/ kg in I. hainanense, much higher than the known species I. virosum. Recovery of muscarine ranged from 93.45% to 97.25%, and the average recovery is 95.56%.

Automated summary

Accurate identification and confirmation of toxins in poisonous mushrooms are crucial in treating mushroom poisoning incidents. This study proposed two new Inosperma species, I. muscarium and I. hainanense, from tropical Asia, with high levels of muscarine detected in both species.