New Liverwort Species Fossombronia bengalensis Discovered in the Sal Forests of West Bengal

In the secluded, damp environments of the Sal forests within the West Midnapore district of West Bengal, botanists have uncovered a new species of liverwort previously unknown to science. This new find, named Fossombronia bengalensis, is a remarkably small non-vascular plant that reaches only a few millimeters in its total length. Its discovery marks a significant contribution to the documented bryoflora of India and serves as a testament to the immense biological wealth found within the region's tropical ecosystems. The formal description of the species was published in the scientific journal Phytotaxa in 2025, authored by a team of researchers from Vidyasagar University in collaboration with international experts, including the prominent Australian bryologist D. Christine Cargill.

The classification of Fossombronia bengalensis as a distinct species was confirmed through a series of rigorous morphological and microscopic evaluations that highlighted its unique taxonomic identity. It is specifically distinguished from its close relatives, such as Fossombronia stephanii, Fossombronia indica, and Fossombronia kashyapii, by the presence of highly undulate leaves and a very specific pattern on the surface of its spores. These spores exhibit a complex reticulate design punctuated by small papillae, with diameters measuring between 25 and 40 micrometers. The plant itself is notably smaller than related species, with a length ranging from 3.5 to 6.8 millimeters. Additionally, the species is dioicous, meaning it has separate male and female plants, with the males being curiously longer than the females. To ensure future scientific reference, the holotype specimen has been placed in the Central National Herbarium of the Botanical Survey of India, located in Howrah.

The researchers, led by Sk. Rasidul Islam and Amal Kumar Mondal, chose the name bengalensis to pay tribute to the state of West Bengal, where the liverwort was first identified and where it is currently thought to be an endemic species. Liverworts, including Fossombronia bengalensis, are considered essential bioindicators that reflect the health and stability of relatively undisturbed natural habitats. The identification of this species suggests that the Sal forests in the southwestern part of Bengal remain ecologically vital and robust, maintaining their biodiversity despite the various pressures of human activity and environmental change. This discovery highlights the importance of preserving these specific forest patches as refuges for rare and specialized flora.

The Sal forests, characterized by the Shorea robusta tree, are an expansive part of India's natural heritage, covering nearly 10 million hectares and serving as a major sink for carbon sequestration. The genus Fossombronia was first established by the botanist Giuseppe Raddi in 1818 and is known to have a cosmopolitan distribution with approximately 96 species recognized globally. Prior to this recent discovery, India was known to host only nine species within this genus, with most records coming from biodiversity-rich areas like the Western Ghats and the Himalayan range. This new finding emphasizes the critical need for ongoing and systematic research into cryptogamic flora, such as mosses and liverworts, to fully understand the scope of India's biodiversity and to better protect these fragile micro-environments.