Isothecium is a genus of mosses in the family Lembophyllaceae, within the order Hypnales and class Bryopsida (the "true mosses" within the phylum Bryophyta). The genus comprises a small number of accepted species — currently four recognised by GBIF — including Isothecium myosuroides, Isothecium alopecuroides, Isothecium holtii, and Isothecium algarvicum. Like other members of Lembophyllaceae, Isothecium mosses are pleurocarpous (branching and mat-forming) and typically produce elongated, tapering shoots that give individual species a distinctive tail-like or caterpillar-like appearance, which is reflected in species epithets such as myosuroides (mouse-tail). The genus has a cosmopolitan distribution, occurring across temperate regions of Europe, Asia, the Americas, and beyond. Species are commonly found growing on tree bark, rocks, and soil in humid, shaded woodland and upland habitats.
Distribution
Isothecium has a cosmopolitan distribution, with species occurring across temperate and oceanic regions worldwide. Individual species such as I. myosuroides and I. alopecuroides are particularly widespread in western and central Europe.
Taxonomy Notes
Isothecium is placed in the family Lembophyllaceae within the order Hypnales (Bryopsida, Bryophyta). GBIF currently recognises four accepted species: I. algarvicum, I. alopecuroides, I. holtii, and I. myosuroides. Taxonomic circumscription of the genus has varied across bryological treatments.
