A new species of Treubia (Treubiaceae, Hepaticophytina) from New Zealand based on molecular evidence: Studies in austral temperate rain forest bryophytes 20
Pfeiffer, Tanja; Frey, Wolfgang; Stech, Michael
According to cpDNA trnLUAA intron sequences and ecological data, Treubia lacunosa specimens from New Zealand fall into two distinct groups ("Treubia 1" and "Treubia 2"). The Treubia 1 specimens, as well as two specimens intermediate between T. lacunosa and T. pygmaea, occur in sheltered, wet and dark microsites in rain forests, whereas the Treubia 2 specimens originate from ± exposed, rather open secondary habitats in forests. Fourteen substitutions and two indels are observed between the trnL intron sequences of both groups. This sequence divergence (4.1%) is even greater than between either of these groups and Treubia tasmanica (2.3-3.5%) or South-American T. scapanioides (2.6-3.2%), which are distinct species, clearly separated by morphology and/or distribution patterns. Based on molecular and ecological differences, the Treubia 2 specimens are segregated from T. lacunosa and described as a distinct species, T. lacunosoides T. Pfeiffer, W. Frey & Stech spec. nov. For T. lacunosa a neotype is selected from the material studied as no type material could be found.All New Zealand Treubia specimens studied which are from primary habitats, including the two specimens which are anatomically and cytologically intermediate between T. lacunosa and T. pygmaea, are assigned to this species, thus expanding the morphological variability of the taxon.