Identification notes
Bryum radiculosum is one of those species that’s easiest to recognise when it lacks capsules and is found in a single well-defined microhabitat – namely, lime-rich wall mortar. That’s because it is one of very few species of Bryum to be commonly found on hard/ calcareous substrates. Bryum capillare also likes such substrates but it is a larger, quite different-looking moss.
When B. radiculosum grows on calcareous soil – as it often does – it is easy to confuse with a number of other small soil-dwelling species and careful checking of capsule characters and/or rhizoids and tubers is needed.
Read the Field Guide account
