Abstract
Three fungal specimens (two sexual and one asexual) were collected during fieldwork conducted in China, Taiwan and Thailand. Both sexual morphs share superficial, black ascomata surrounded by flexuous setae; 8-spored, unitunicate, cylindrical asci, with J+, apical ring, and ellipsoidal to allantoid, aseptate, guttulate ascospores. The asexual morph has ceratosporium-like conidia arising from aerial hyphae with a single arm and are usually attached or with 2–3 arms, brown, often with a subglobose to conical cell at the point of attachment. Morphological examinations and phylogenetic analyses of a combined LSU-ITS dataset via maximum likelihood and Bayesian analyses indicated that these three collections were new species. Iodosphaeriachiayiensis (sexual morph), I.thailandica (sexual morph) and I.jinghongensis (asexual morph) are therefore introduced as new species in this study. Iodosphaeriachiayiensis has small, hyaline and ellipsoidal to allantoid ascospores, while I.thailandica has large ascomata, cylindrical to allantoid asci and hyaline to pale brown ascospores.
Highlights
Iodosphaeria was introduced by Samuels et al (1987) with its type I. phyllophila on a rachis of Cyathea sp., from Brazil
This study introduces three novel Iodosphaeria species from China, Taiwan, and Thailand
The best scoring RAxML tree is shown in Figure with a final Maximum Likelihood bootstrap values (ML) optimization likelihood value of -7278.703992
Summary
Iodosphaeria was introduced by Samuels et al (1987) with its type I. phyllophila on a rachis of Cyathea sp., from Brazil. Members of Iodosphaeria are regarded as cosmopolitan species (Li et al 2015) These species are usually saprobic on dead branches, twigs, stems, and petioles of economically important plants, such as Alnus sp., Archontophoenix alexandrae, Arundinaria sp., Corylus sp., Cyathea dealbata, Podocarpus parlatorei, Polygonum chinense and Ripogonum scandens (Samuels et al 1987; Barr 1993; Hyde 1995; Candoussau et al 1996; Hsieh et al 1997; Taylor and Hyde 1999; Catania and Romero 2012; Li et al 2015; Miller and Réblová 2021), but have never been reported as pathogens (Hyde et al 2020a)
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