Ignatova, E.A., D.Ya. Tubanova, O.D. Tumurova, D.V. Goryunov &
O.I. Kuznetsova. When the plant size matters: a new semi-cryptic
species of Dicranum from Russia
Arctoa (2015) 24: 471-488
doi: 10.15298/arctoa.24.38
The
analysis of nuclear ITS1-2 and chloroplastic
trnL-F DNA sequences revealed an undescribed species closely related to D. spadiceum, and it is described as Dicranum
schljakovii Ignatova
& Tubanova, sp. nova. Its distinctive
characters include the smaller size of plants and leaves, and a different leaf
shape. Its distribution area covers the southern part of Asian Russia, Yakutia, Russian Far East (Primorsky
Territory, Kamchatka, Sakhalin and Kuril Islands) and Urals, plus few
localities in Taimyr and a single disjunct locality
in Murmansk Province. The distinction of D. spadiceum
var. spadiceum and var. subscabrifolium
is not confirmed by the molecular markers used in the study. Morphological chracteristics of D. spadiceum
are corrected by the addition of some characters of var. subscabrifolium.
Synonymization of D. angustum
and D. laevidens with D. spadiceum is not confirmed as well, and these two
species are not closely related to each other. Descriptions and illustrations
for D. spadiceum and D. schljakovii
are provided, their distribution and ecology are reviewed, and a key to the
identification of species of Dicranum sect. Muehlenbeckia with the addition of
D. laevidens is given.