Aquilariomyces T. Y. Du, Tibpromma & Karun. 2024

Du, Tian-Ye, Karunarathna, Samantha C., Hyde, Kevin D., Nilthong, Somrudee, Mapook, Ausana, Dai, Dong-Qin, Rajeshkumar, Kunhiraman C., Elgorban, Abdallah M., Han, Li-Su, Wang, Hao-Han & Tibpromma, Saowaluck, 2025, New Aquilariomyces and Mangifericomes species (Pleosporales, Ascomycota) from Aquilaria spp. in China, MycoKeys 112, pp. 103-125 : 103-125

Aquilariomyces T. Y. Du, Tibpromma & Karun. 2024

Notes.

Aquilariomyces was introduced by Du et al. (2024 b) as a monotypic genus to accommodate Aq. aquilariae T. Y. Du, Tibpromma & Karun. as the type species, which was collected from Aquilaria yunnanensis S. C. Huang in Yunnan Province, China. Based on well-separated phylogenetic branches and unique sexual morphs of asci and ascospores, Aquilariomyces was introduced as a new genus in Thyridariaceae ( Du et al. 2024 b) . This genus is characterized by globose to subglobose, brown to dark brown, solitary or gregarious ascomata in small groups, immersed under the bark, surrounded by brown to black fluffs; a peridium comprising hyaline to brown cells of textura angularis; hyaline septate, branched, trabeculate pseudoparaphyses, embedded in a gelatinous matrix; 8 - spored, bitunicate, clavate, apically rounded asci, with an ocular chamber, and club-shaped, short pedicel; and uniseriate, 1 - septate, fusiform to ellipsoidal ascospores, surrounded by mucilaginous sheath, while the asexual morph is not reported. The updated phylogenetic tree of Aquilariomyces is shown in Fig. 2 .

Figures

Figure 2. Phylogram generated from maximum likelihood (ML) analysis based on combined LSU, ITS, SSU, tef 1 - α, and rpb 2 sequence data of 52 taxa, which comprised 4387 base pairs of LSU = 967, ITS = 516, SSU = 872, rpb 2 = 1024, tef 1 - α = 1008. The best-scoring RAxML tree with a final likelihood value of - 31596.745436 is presented. The matrix had 2090 distinct alignment patterns, with 47.13 % of undetermined characters or gaps. Estimated base frequencies were as follows: A = 0.249245, C = 0.257277, G = 0.271627, T = 0.221851; substitution rates: AC = 1.210949, AG = 2.948777, AT = 1.318881, CG = 0.897105, CT = 6.444599, GT = 1.0; gamma distribution shape parameter α = 0.441696. Bootstrap support values for ML equal to or greater than 70 % and clade credibility values equal to or greater than 0.90 from Bayesian inference analysis are labelled at each node. The tree is rooted with Trematosphaeria pertusa (CBS 122368). The new isolates are indicated in red, and the ex-type strains are in bold.