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Issue: Vol. 742 No. 1: 18 Feb. 2026
Type: Article
Published: 2026-02-18
DOI: 10.11646/phytotaxa.742.1.3
Page range: 55-75
Abstract views: 14
PDF downloaded: 0

Sri Lanka, a new hotspot for Rhytidhysteron (Hysteriaceae): a novel species and three new records

Department of Botany, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka
Genetics and Molecular Biology Unit, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka; Center for Plant Materials and Herbal Product Research, Faculty of Applied Sciences, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka
Department of Export Agriculture, Faculty of Animal Science and Export Agriculture, Uva Wellassa University, Badulla 90000, Sri Lanka
Department of Urban Bioresources, Faculty of Urban and Aquatic Bioresources, University of Sri Jayewardenepura, Gangodawila, Nugegoda 10250, Sri Lanka
Ascomycota Dothediomycetes Fungal systematics Hysteriales Saprobes Fungi

Abstract

The genus Rhytidhysteron is ecologically diverse, cosmopolitan group of Dothideomycetes characterized by apothecioid ascomata, in which the margin folds inwards, covers the disc incompletely in dry conditions, unfolds outwards exposing the disc by a lenticular or irregular opening when hydrated, bitunicate, cylindrical asci, and hyaline to reddish brown, ellipsoidal to fusiform, 1–3 septate ascospores. This study was conducted on five Rhytidhysteron specimens isolated from dead wood pieces in urban forest habitats (Colombo District, Sri Lanka). Detailed micro and macro morphological examinations and phylogenetic analyses inferred from ITS, LSU, and TEF1 were used to position the five specimens compared with the extant Rhytidhysteron taxa. Based on morphological and phylogenetic evidence, they were identified as R. rufulum, R. neorufulum, R. cf. bruguiereae and a novel species, R. constrictiseptum; altogether providing first records for three Rhytidhysteron species in Sri Lanka, except R. neorufulum.

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How to Cite

Silva, N.T.D., Thambugala, K.M., Yasanthika, W. & Ekanayaka, A.H. (2026) Sri Lanka, a new hotspot for Rhytidhysteron (Hysteriaceae): a novel species and three new records. Phytotaxa 742 (1): 55–75. https://doi.org/10.11646/phytotaxa.742.1.3