

FOLLOWUS
School of Life Science, Shanxi Key Laboratory for Research and Development of Regional Plants, Shanxi University, Taiyuan 030006, China
Shulian XIE, xiesl@sxu.edu.cn
纸质出版:2022-03
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Kunpeng FANG, Fangru NAN, Jia FENG, et al.
Kunpeng FANG, Fangru NAN, Jia FENG, et al.
Species of the red algal order Acrochaetiales mostly inhabit marine environments
with only two freshwater taxa
Audouinella
and
Ottia
. A new genus and species are described for freshwater red alga
Pauciramus yunnanensis
from Ailao Mountain
Yunnan
China. It is closely related to
Ottia
and a new order Ottiales was proposed for these genera.
Pauciramus
has unique combination of morphological characteristics including the following: plants caespitose and densely pulvinate
slender uniseriate filaments with well-developed rhizoids
rarely branched
cylindrical vegetative cell with a single
ribbon-shaped and parietal chloroplast
reproduction by tetrasporangia
and dense sporangial branchlet only at the upper portion of filaments. Phylogenetic analysis of sequence data from the plastid ribulose-1
5-bisphosphate carboxylase-oxygenase large-subunit (
rbc
L)
small subunit gene of the ribosomal cistron (SSU) and barcode region near the 5' end of the mitochondrial cytochrome oxidase subunit I (COI-5P) indicated that: the new taxon
P
.
yunnanensis
was in a well-supported clade with
Ottia meiospora
and this clade was sister to order Palmariales and Acrochaetiales. To adhere to the principle of monophyly
a new freshwater order Ottiales including
Ottia
and
Pauciramus
is proposed. Despite the high sequence interspecific divergences and obvious morphological differences between genera
Ottia
and
Pauciramus
seems impractical to establish a new family for a monospecific genus. Therefore
we temporarily classified
Pauciramus
into the family Ottiaceae
and made necessary revisions to the description to accommodate this genus.
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