Codonoblepharonteae, a New Major Lineage among Orthotrichoideae (Orthotrichaceae, Bryophyta)

Area of Science:

• Bryology
• Plant Systematics
• Molecular Phylogenetics

Background:

• The Orthotrichoideae subfamily comprises epiphytic mosses found globally in temperate and high-altitude tropical regions.
• Current classification recognizes 14 genera within two tribes: Orthotricheae and Zygodonteae.
• The genus Codonoblepharon has received limited phylogenetic attention, with previous studies suggesting it may not belong to the Zygodonteae tribe.

Purpose of the Study:

• To clarify the taxonomic position of the genus Codonoblepharon.
• To investigate the phylogenetic relationships of Codonoblepharon within the Orthotrichoideae subfamily.
• To establish a robust evolutionary framework for Codonoblepharon.

Main Methods:

• Phylogenetic analysis using four genetic loci: nuclear ITS2 and plastid rps4, trnG, and trnL-F.
• Reconstruction of an updated phylogenetic tree incorporating a representative sample of Codonoblepharon species.
• Comparative analysis of molecular data to infer evolutionary relationships.

Main Results:

• Phylogenetic reconstruction confirms Codonoblepharon forms a monophyletic group.
• This group is found to be sister to all other genera within Orthotrichoideae.
• Codonoblepharon represents a lineage independent of the established Orthotricheae and Zygodonteae tribes.

Conclusions:

• The genus Codonoblepharon constitutes a distinct evolutionary lineage within Orthotrichoideae.
• Based on its independent phylogenetic position, a new tribe, Codonoblepharonteae, is proposed.
• This taxonomic revision refines the understanding of Orthotrichoideae evolution and classification.