Three New Inosperma Mushrooms Discovered in Western Sichuan

Rui Wu, Peng‑Ping Duan, Meng‑Meng Lai, Zheng‑Mi He, and Zuo‑Hong Chen described three previously unknown species of the genus Inosperma (family Inocybaceae) from the subalpine regions of western Sichuan, China. The study appears in MycoKeys volume 141, pages 1–22, DOI 10.3897/mycokeys.141.200822 ¹.net].

The newly named taxa are I. fibrifugum, I. glomerisquamulosum, and I. lilacinifolium. Morphological examination revealed that I. fibrifugum possesses a fuscous brown pileus with a fibrillose to scaly surface; scales persist only on the umbo at maturity, while the context bruises reddish‑brown when handled. I. glomerisquamulosum is characterized by small basidiomata bearing a yellowish‑brown pileus covered with distinct scales, an indistinct odor, and lacking caulocystidia. Finally, I. lilacinifolium displays a pale violet‑brown papillate umbo and a purplish‑white margin retaining faint veil remnants.

Phylogenetic analysis based on internal transcribed spacer (ITS), nuclear large subunit (nrLSU), and RNA polymerase II second largest subunit (rpb2) sequences placed the three species into separate, strongly supported clades. Both I. fibrifugum and I. glomerisquamulosum fall within the Cervicolores clade, each sister to I. mucidiolens and I. turietoense, respectively. In contrast, I. lilacinifolium belongs to the Maculatum clade, clustering closely with I. quietiodor and I. shawarense. These findings underscore the genetic diversity that persists in Sichuan’s high‑altitude ecosystems ¹.net].

The discovery of these new species adds to the growing understanding of fungal diversity in Chinese ecosystems. Previous studies have also described novel mushroom taxa from this region, highlighting its importance as a hotspot for mycological exploration.

Detailed morphological descriptions and multi‑gene phylogeny presented by Wu et al. provide a robust framework for future research on ecological roles and distribution patterns of Inosperma across East Asia ¹.net].

Overall, the study demonstrates how meticulous morphology combined with modern molecular tools can uncover hidden fungal diversity even within well‑studied regions. As researchers continue to explore China’s varied landscapes, more such discoveries are likely to emerge, enriching both scientific knowledge and practical appreciation of the country’s rich mycological heritage.