Dematipyriforma L. Y. Sun, Hai-Yan Li, Xiang Sun & L.D. Guo.
Index Fungorum number: IF 808026; MycoBank number: MB 808026
Notes – Dematipyriforma is a monotypic genus typified by D. aquilaria L. Y. Sun, Hai-Yan Li, Xiang Sun & L.D. Guo that was isolated as an endophyte from a trunk of Aquilaria crassna in Laos (Sun et al. 2017). The genus is characterized by monoblastic, integrated, intercalary or terminal, pale brown to brown, determinate, cylindrical conidiogenous cells; solitary, pyriform conidia with transverse and often oblique or longitudinal, usually with a single small basal cell; produce variously shaped Chlamydospores in culture (Sun et al. 2017). During an ongoing study of freshwater fungi from River Nile in Egypt (e.g. Abdel-Aziz 2016a, b, c, 2020), three new species of Dematipyriforma were recorded on submerged wood and date palm rachis in the River Nile, Egypt that are described in this article based on morphology and their phylogenetic placement. Species of Dematipyriforma are phylogenetically related to Rhexoacrodictys species, both genera have rhexolytic conidial secession, however the later genus has macronematous conidiophores and percurrently extending conidiogenous cells vs. absent or micronematous conidiophores and determinate conidiogenous cells in Dematipyriforma. Boonmee et al. (2021) described Rhexoacrodictys nigrospora Boonmee, D.F. Bao & K.D. Hyde from decaying wood in Thailand with micronematous or semi-macronematous conidiophores and determinate conidiogenous cells. They did not include the sequences of Dematipyriforma aquilariain their phylogenetic analyses and in our opinion R. nigrospora can be placed in Dematipyriforma based on morphology of the conidiophores (micronematous vs. macronematous with bulbous base) and conidiogenesis (determinate vs. percurrent proliferation in Rhexoacrodictys erecta (Ellis & Everh.) W.A. Baker & Morgan-Jones) and the phylogenetic analyses (Fig. 1).
Figure 1 – Phylogenetic relationship of Dematipyriforma with related taxa based on the nucleotide sequences of the combined SSU and LSU rDNA. The maximum likelihood (ML) tree was constructed in MEGA X (Kumar et al. 2018). The maximum parsimonious data set of the combined genes consisted of 30 taxa with three representatives of Hypocreales used as outgroup. Phylogenetic trees obtained from ML, MP and BYPP were similar in topology. Bootstrap support on the nodes represents ML and MP≥50%. Branches with a BYPP of≥95% are in bold. The three new Dematipyriforma species are in blue
Species