Novel Mucor species (Mucoromycetes, Mucoraceae) from northern Thailand

Abstract

Mucor species are common fast-growing fungi found in soil. Two new species of Mucor and one new geographical record of M. nederlandicus were collected from northern Thailand and are described in this study. Evidence from morphophysiological data and phylogenetic analysis supports the introduction of the new taxa. Phylogenetic analysis based on the internal transcribed spacer (ITS) and large subunit of the nuclear ribosomal RNA (LSU) data showed that the new isolates cluster distinctly from other Mucor species with high or maximum bootstrap support. Mucor aseptatophorus is characterized by aseptate sporangiophores, globose columella, resistant and deliquescent sporangia, has sympodial, and monopodial branches and shows growth at 37 °C. It also differs from M. irregularis in having smaller sporangiospores, and larger sporangia. Mucor chiangraiensis has subglobose or slightly elongated globose columella, produces hyaline sporangiospores, and resistant and deliquescent sporangia. Furthermore, this species has wider sporangiophore, smaller sporangia and lower growth than M. nederlandicus. A detailed description of the species and illustrations are provided for the novel species.

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“…Sequence data of closely related Mucor spp. were selected from data previously published by Walther et al [ 10 ], Li et al [ 26 ], Wanasinghe et al [ 11 ], Lima et al [ 27 ], and Hurdeal et al [ 5 ], and downloaded from GenBank ( (accessed on 10 March 2022) [ 31 ] for molecular phylogenetic analyses ( Table 1 ). Sequences of datasets ITS (44 taxa) and LSU (45 taxa) were aligned using MAFFT ( (accessed on 12 March 2022) with the algorithm L-INS-I [ 32 ], and the alignment was checked in MEGA7 [ 33 ].…”

“…The genus Mucor was described by Fresenius [ 1 ], and it is classified in the family Mucoraceae , order Mucorales , and phylum Mucoromycota , which belongs to the early diverging fungi [ 2 ]. With more than 90 currently accepted species [ 3 , 4 , 5 , 6 , 7 , 8 ], Mucor is the largest genus within the Mucorales . Species of Mucor are known to be saprotrophs that are usually isolated from dung, soil, freshwater, insects, or fruits [ 6 , 9 , 10 , 11 , 12 , 13 , 14 ].…”

“…Hyde & H.B. Lee [ 5 ]. Most of those species were isolated from soil [ 5 , 26 , 27 ], except for M .…”

“…Lee [ 5 ]. Most of those species were isolated from soil [ 5 , 26 , 27 ], except for M . fluvii , which was isolated from freshwater [ 11 ].…”