Two new psathyrelloid species of Coprinopsis (Agaricales, Psathyrellaceae) from China

In this study, Coprinopsis jilinensis and Coprinopsis pusilla were introduced, based on their morphological characteristics, the internal transcribed spacer (ITS) and large subunit ribosomal (LSU) region sequences of nrDNA. These new psathyrelloid species were found in Jilin Province, China. Coprinopsis jilinensis has brown pileus, utriform pleurocystidia, brown, smooth, dextrinoid basidiospores and tiny pore. It mainly grows on humus. Coprinopsis pusilla has small basidiomata, greyish-white pileus, thick and distinct veil at edges, subcolourless and verrucose basidiospores. It is poreless and it grows on the decaying wood of broad-leaved trees. Both of them belong to the C. sect. Melanthinae. A supplementary description of C. sect. Melanthinae was given in combination with the newly-discovered taxa and an identification key to the fourteen psathyrelloid species of Coprinopsis is provided. Coprinopsis sect. Canocipes and C. sect. Quartoconatae were evaluated and the phylogenetic position of the psathyrelloid species of Coprinopsis was discussed. Psathyrella subagraria, as a confusing species, was also discussed in this study.

Automated summary

This study introduced Coprinopsis jilinensis and Coprinopsis pusilla based on their morphological characteristics and molecular sequences. They were found to have different pileus colors, spore morphology, and growth environments. A comprehensive description of C. sect. Melanthinae and an identification key to 14 psathyrelloid species of Coprinopsis were provided. The phylogenetic position of psathyrelloid species of Coprinopsis and the confusing species Psathyrella subagraria were discussed.