Borovichev, E.A., V.A.
Bakalin & A.A. Vilnet. Revision
of the Russian Marchantiales. II. A review of
the genus Asterella P. Beauv.
(Aytoniaceae, Hepaticae)
Arctoa (2015) 24: 294-313
doi: 10.15298/arctoa.24.26
The genus Asterella P. Beauv. includes four species in
Russia: A. leptophylla and A. cruciata are restricted to the southern flank of the
Russian Far East and two others, A. saccata and
A. lindenbergiana occur mostly in the subartcic zone of Asia and the northern part of European
Russia. Asterella cruciata
is recorded for the first time in Russia. The study of the ribosomal LSU (or 26S) gene and trnL-F
cpDNA intron confirmed the
placement of Asterella gracilis
in the genus Mannia and revealed the close
relationship of A. leptophylla and A. cruciata,
and the rather
unrelated position of A. saccata and A. lindenbergiana. The phylogenetic
tree includes robustly supported terminal clades,
however with only weak support for deeper nodes. In general, Asterella species and M. gracilis
from Russia show low levels of infraspecific
variation. An identification key and species descriptions based on Russian
specimens are provided, along with details of specimens examined, ecology and
diagnostic characters of species.