Nectria eustromatica sp. nov., an exceptional species with a hypocreaceous stroma.

Area of Science:

• Mycology
• Fungal Taxonomy
• Molecular Phylogenetics

Background:

• Fungal species identification relies on morphological and molecular data.
• Nectria species are important plant pathogens and endophytes.
• Accurate species delineation is crucial for ecological and agricultural understanding.

Purpose of the Study:

• To describe and formally name a new fungal species, Nectria eustromatica.
• To determine the phylogenetic placement of N. eustromatica within the Nectria genus.
• To characterize the teleomorph and anamorph morphology and ecology of the new species.

Main Methods:

• Morphological analysis of teleomorph and anamorph stages.
• Molecular phylogenetic analyses using LSU, ITS, rpb2, and tef1 gene sequences.
• Ecological data collection from field observations.

Main Results:

• Nectria eustromatica is described with sphaeroid perithecia within stromata on a subiculum.
• Phylogenetic analyses, using a combined dataset, place N. eustromatica within Nectria sensu stricto with high support.
• The anamorph exhibits traits of Stilbella and Tubercularia, producing phialoconidia and non-phialidic macroconidia.

Conclusions:

• Nectria eustromatica represents a novel species with distinct morphological features.
• Molecular data confirm its placement within the Nectria genus, despite deviating teleomorph morphology.
• The unique anamorph characteristics warrant further investigation into its reproductive biology and ecological role.