 The limestone rock exposures and aqueduct walls are location for many species of moss and fern, some of which, e.g.Rusty Beard-moss "Didymodon ferrugineus" (previously "Barbula reflexa"), Brown Beard-moss "Didymodon spadiceus" (previously "Barbula spadicea") and Brittle Bladder-fern "Cystopteris fragilis", are rare in Southern England.An aqueduct for Bristol water supply follows the line of the combe.