Radula visianica C.Massal. (1904:298)



Taxonomy & Nomenclature

Synonym/s: Radula visiniaca C.Massal. [orth. error used by Baillie & Butcher, 2012:88]


Conservation Status

Last record: 1938 (Gerola, 1938)

Rediscovered in 2014 (Köckinger, 2016)

IUCN RedList status: Critically Endangered



Austria & Italy


"This species is endemic to Europe, where it is currently known from five recently found extant localities in Austria (Köckinger 2016). The species has gone extinct in Italy where it was known from two localities (Massalongo 1904, Gerola 1938), and the species has not been seen in Italy since 1938. Aleffi et al. (2004) conducted some searches in the two known Italian localities: on the Colli Euganei in Veneto (Massalongo 1904) and in the Bosco Welsperg (Fiera di Primiero, Val Cismòn) in Trentino-Alto Adige (Gerola 1938), however, the species was not re-found."

(Campisi et al., 2019)


Biology & Ecology










Original scientific description:

Massalongo, C. (1904). Intorno alla “Radula visianica” sp. nov. Annals of botany (Rome) 1: 297-300. [Italian record; now believed regionally extinct from the country]


Other references:

Aleffi, M., Schumacker, R. and Tacchi, R. (2004). Contributo alla conoscenza della flora briologica del Trentino: il Bosco Welsperg (Parco Naturale Paneveggio-Pale di S. Martino), con una nota sulla Radula visianica C. Massal. [Contribution to the knowledge of the bryological flora of Trentino: the Welsperg Wood (Paneveggio-Pale di S. Martino Nature Park), with a note on Radula visianica C. Massal.]. Braun-Blanquetia 34: 87-94.

Baillie, Jonathan E. M. and Butcher, Ellen R. (2012). Priceless or Worthless? The world’s most threatened species. London, UK: Zoological Society of London.

Bryophyte Specialist Group. (2016). Radula visianica. The IUCN Red List of Threatened Species 2016: e.T39212A87581242. Downloaded on 19 November 2016.

Campisi, P., Cogoni, A., Garcia, C., Hodgetts, N., Kucera, J., Lara, F. & Schröck, C. (2019). Radula visianica. The IUCN Red List of Threatened Species 2019: e.T39212A87773082. Accessed on 15 April 2022.

ECCB. (1995). Red Data Book of European Bryophytes. European Committee for Conservation of Bryophytes (ECCB), Trondheim.

Gerola, F. M. (1938). La Radula visianica Mass. nelle Alpi Tridentine. Nuovo Giornale Botanico Italiano 45: 602. [Italian record; now believed regionally extinct from the country]

Hallingbäck, Tomas and Hodgetts, Nick. (compilers). (2000). Mosses, Liverworts, and Hornworts. Status Survey and Conservation Action Plan for Bryophytes. IUCN/SSC Bryophyte Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK. x + 106 pp.

Köckinger, H. (2016). Rediscovery and redescription of the enigmatic Radula visianica (Porellales, Marchantiophyta). Herzogia 29(2): 625-634. [Abstract]

Söderström, Lars et al. (2016). World checklist of hornworts and liverworts. PhytoKeys 59: 1-828.

Váňa, Jiří, Bechteler, Julia, Schäfer-Verwimp, Alfons, Renner, Matthew A. M. and Heinrichs, Jochen. (2017). Integrative Taxonomy Substantiates the Presence of Three Radula Species in Austria: Radula complanata, R. lindenbergiana, and R. visianica (Porellales, Jungermanniopsida). Cryptogamie, Bryologie 38(2):125-135. [Abstract]


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