Selected material studied: Cartagena, Peña del Águila, Guerra s.n. (MUB 2397).
Open soils and accumulated soil under rocks.
Previous records: Esteve & Cortés Latorre (1954) and Cortés Latorre (1955) sub Trichostomum viridulum var. unguiculatum; Rungby (1962) sub T. mutabile and T. mutabile var. densum; Runbgy (1964) sub T. mutabile; Casas (1973) sub T. brachydontium subsp. mutabile; Alcaraz et al. (1982) sub T. brachydontium subsp. mutabile; Ros & Llimona (1984); Ros & Guerra (1987) sub T. brachydontium and T. brachydontium subsp. cuspidatum, T. brachydontium subsp. densum, T. brachydontium subsp. mutabile, T. brachydontium subsp. unguiculatum; Guerra et al. (1993) sub T. brachydontium and T. brachydontium subsp. unguiculatum; Sánchez-Moya & Cano (1999); Guerra (2002); Cano et al. (2004); Guerra et al. (2006); Cros et al. (2010).
