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Issue: Vol. 714 No. 2: 8 Aug. 2025
Type: Article
Published: 2025-08-08
DOI: 10.11646/phytotaxa.714.2.4
Page range: 157-170
Abstract views: 411
PDF downloaded: 11

Morpho-molecular analyses reveal a novel species Acrocalymma hibisci and a new host record of Acrocalymma medicaginis

Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand; Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; Department of Plant Pathology, College of Agriculture, Guizhou University, Guiyang Guizhou 550025, P.R. China
1 new record 1 new species Hibiscus rosa-sinensis multigene phylogeny Thailand Tithonia diversifolia Fungi

Abstract

Dead stems of Hibiscus rosa-sinensis and Tithonia diversifolia were collected from Chiang Rai Province, in northern Thailand and examined for microfungi. Two species of Acrocalymma were observed. Multigene phylogenetic analyses of LSU, SSU and ITS sequences support their placement within Acrocalymmaceae. Acrocalymmaceae (Pleosporales), which includes the single genus, Acrocalymma. This genus is globally distributed and associated with diverse hosts. Acrocalymma is characterized by ostiolate ascomata, furcate, pedicellate asci, and hyaline to brown or pale reddish-brown, obovoid to ellipsoid ascospores. The asexual morph has smooth-walled conidiogenous cells and cylindric-clavate to fusiform, guttulate conidia with a helmet-shaped mucilaginous appendage at the apex. Based on morphology and molecular data, we report the new species Acrocalymma hibisci on H. rosa-sinensis and a new host record of A. medicaginis on T. diversifolia. Acrocalymma hibisci differs from other species by having seven-septate conidia. This study presents comprehensive descriptions and micrographs of the isolates along with multigene phylogenetic data.

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How to Cite

Weerasinghe, G.O., Bhunjun, C.S., Phukhamsakda, C., Thakshila, S.A., Tun, Z.L., Al-Otibi, F. & Hyde, K.D. (2025) Morpho-molecular analyses reveal a novel species Acrocalymma hibisci and a new host record of Acrocalymma medicaginis. Phytotaxa 714 (2): 157–170. https://doi.org/10.11646/phytotaxa.714.2.4