Multi-Gene Phylogeny and Morphology Reveal Haplohelminthosporium gen. nov. and Helminthosporiella gen. nov. Associated with Palms in Thailand and A Checklist for Helminthosporium Reported Worldwide

Abstract

Palms (Arecaceae) are substrates for a highly diverse range of fungi. Many species are

known as saprobes and many are important plant pathogens. Over the course of our studies of micro- fungi from palms in Thailand, two new taxa were discovered. Morphological characteristics and

phylogenetic analyses of combined ITS, LSU, SSU, and tef1-α sequence data revealed their taxonomic

positions within Massarinaceae. There are currently ten genera identified and accepted in Massari- naceae, with the addition of the two new genera of Haplohelminthosporium and Helminthosporiella, that

are introduced in this paper. Each new genus is provided with a full description and notes, and each new taxon is provided with an illustration for the holotype. A list of identified and accepted species

of Helminthosporium with morphology, host information, locality, sequence data, and related refer- ences of Helminthosporium reported worldwide is provided based on records in Species Fungorum

2021. This work provides a micro-fungi database of Haplohelminthosporium, Helminthosporiella, and Helminthosporium which can be modified and validated as new data come to light.