Backusella fujianensis H. Zhao & X. Y. Liu, 2024

Zhao, Heng, Nie, Yong, Huang, Bo & Liu, Xiao-Yong, 2024, Unveiling species diversity within early-diverging fungi from China I: three new species of Backusella (Backusellaceae, Mucoromycota), MycoKeys 109, pp. 285-304 : 285-304

Backusella fujianensis H. Zhao & X. Y. Liu sp. nov.

Fig. 3

Etymology.

fujianensis (Lat.) refers to Fujian province where the type was collected.

Holotype.

HMAS 352889 .

Colonies on PDA at 25 ° C for 4 days, reaching 90 mm in diameter, more than 15 mm high, granulate, lobed and scaly, initially white, soon becoming pale mouse-grey, reverse straw-yellow stramineus. Hyphae aseptate at first, septate with age, hyaline, 5.5–25.5 μm in diameter. Rhizoids absent. Stolons absent. Long sporangiophores arising directly from substrate or aerial mycelia, transitorily curved, monopodially branched, usually with large terminal sporangia, erect, bent or curved. Sporangia subglobose to globose, hyaline to brownish, rough-walled, multi-spored, with more than 50 sporangiospores per sporangium, persistent-walled, 70.0–160.0 μm in diameter. Short sporangiophores unbranched, ending with a multi-spored sporangiolum. Multi-spored sporangiola subglobose to globose, hyaline, containing more than 20 sporangiospores, 45.0–65.0 μm in diameter, persistent-walled. Uni-sporangiola unknown. Apophyses absent. Collars if present, small. Columellae hemispherical, depressed globose to subglobose, hyaline to light brown, 36.0–64.5 × 33.0–63.5 μm in long sporangiophores, and conical and hemispherical, hyaline, 13.0–21.0 × 12.0–20.0 μm in short sporangiophores. Sporangiospores elliptical, rarely irregular, hyaline, with droplets, 12.0–21.5 × 6.0–10.5 μm. Azygosporangia absent. Chlamydospores absent. Zygospores absent.

Materials examined.

China • Fujian Province, Wuyishan City , 27 ° 48 ' 59 " N, 117 ° 42 ' 46 " E, from forest soil sample, 15 October 2022, Heng Zhao (holotype HMAS 352889 , living ex-holotype culture HZ 219-1, and living culture HZ 219-2) .

GenBank accession numbers.

ITS, PP 477391 and PP 477392; LSU, PP 477401 and PP 477402, RPB 1, PP 709511 and PP 709512.

Maximum growth temperature.

35 ° C.

Figures

Figure 3. Morphologies of Backusella fujianensis ex-holotype HZ 219-1 a, b colonies on PDA (a obverse b reverse) c, d sporangiophores with columellae e short sporophore with multi-spored sporangia f tall sporophore with multi-spored sporangia g sporangiospores. Scale bars: 20 μm (c – f); 10 μm (g).