Abstract
Species of Absidia are distributed widely in the environment, while their diversity is insufficiently studied. Three new species, A. frigida, A. gemella and A. longissima, are proposed herein from Xinjiang and Yunnan in China based on phylogenetic, morphological and physiological evidence. According to maximum likelihood (ML), maximum parsimony (MP) and Bayesian inference (BI) analyses, the phylogenetical results suggest that A. frigida, A. gemella and A. longissima are closely related to A. psychrophilia, A. turgida and A. zonata and A. koreana, respectively, based on ITS and LSU rDNA sequences. Absidia frigida is characterized by a lower growth temperature, which does not grow above 24 °C. It differs from A. psychrophilia by sporangiophores, sporangia, columellae, collars and projections. Absidia gemella is distinguished from A. turgida by hypha, sporangiospores, sporangia, projections and sporangiophores. Absidia longissima is discriminated from A. zonata and A. koreana by sporangiophores, columellae and collars. The three new species are described and illustrated in this article.
Highlights
Absidia Tiegh. is a core genus of early-diverging fungi, belonging to Mucoromycota, Mucoromycotina, Mucoromycetes, Mucoromycetes, Mucorales and Cunninghamellaceae
We propose three new species of Absidia from Xinjiang and Yunnan, Diversity 2022, 14, x FOR PEER REVIECWhina (Tables 1 and 2; Figures 1–4)
The results suggest that Absidia frigida is closely related to A. psychrophilia (100/100/1.00); Absidia gemella is next to A. turgida; and, A. longissima is closely related to A. zonata and A. koreana (100/100/1.00)
Summary
Absidia Tiegh. is a core genus of early-diverging fungi, belonging to Mucoromycota, Mucoromycotina, Mucoromycetes, Mucoromycetes, Mucorales and Cunninghamellaceae (www.indexfungorum.org, accessed on 27 December 2021). Absidia was erected in 1876 and typified by A. reflexa Tiegh. Some species are found in the mycangia of ambrosia beetles (A. psychrophilia) [11,12], as well as the body surface of bats (A. stercoraria: https://bccm.belspo.be/content/remarkablefungal-biodiversity-northern-belgium-bats, accessed on 27 December 2021). Species within Absidia possess important metabolites for industrial and medical applications, such as steroids, α-galactosidase, laccase, fatty acids and chitosan [13,14,15,16,17,18]. Sporangia are multi-spored, pyriform to globose, deliquescent-walled and apophysate [2,3,4,19]. Columellae are conical, suglobose to globose or applanate, commonly with one to several projections [2,4,20,21]. Zygospores are contained in zygosporangia, and their opposite suspensory cells are appendaged [13,20]
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