Abstract
Ptilidium ciliare is so common in the North Holarctic and hypothetically morphologically uniform that possible diversification may have been overlooked. Previous results however showed the presence of “cryptic” diversity within the species. In the present investigation we show: 1) this diversity is not cryptic, 2) the taxon we describe as P. himalayanum has at least a Sino-Himalayan range, and 3) it occupies a morphologically intermediate position between what has traditionally been treated as P. ciliare and P. pulcherrimum. Both latter taxa are only slightly diverged genetically, and sometimes morphological discrimination is challenging such that both are better treated as varieties or subspecies within a single species.
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<p>Evans, A.W. (1906) Notes on New England Hepaticae IV. <em>Rhodora</em> 8: 34–45.</p>
<p>Fischer, F.E.L. von, Meyer, C.A.A. von, Trautvetter, E.R. von (1859) <em>Index seminum, quae Hortus botanicus imperialis petropolitanus pro mutua commutatione offert. Accedunt Animadversiones botanicae nonnullae, 1858</em>. St. Petersburg, 54 pp.</p>
<p>Goloboff, P.A. & Catalano, S. (2016) T.N.T. version 1.5, including a full implementation of phylogenetic morphometrics. <em>Cladistics</em> 32: 221–238. https://doi.org/10.1111/cla.12160</p>
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<p>Hall, T.A. (1999) BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/NT. <em>Nucleic Acids Symposium Series</em> 41: 95–98.</p>
<p>Hampe, E. (1836) <em>Prodromus florae Hercyniae</em>. Gebauerschen Buchdruckerei, Halle, 90 pp. https://doi.org/10.5962/bhl.title.6713</p>
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<p>Konstantinova, N.A. Vilnet, A.A. & Mamontov, Yu.S. (2020) <em>Lophozia svalbardensis</em>. <em>Arctoa</em> 29 (2): 124–134. https://doi.org/10.15298/arctoa.29.10</p>
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