Mucor tofus Y. N. Wang & R. Y. Zheng, 2022

Wang, Ya-Ning & Zheng, Ru-Yong, 2022, Mucor tofus, a new species isolated from Mao-tofu (a fermented soybean food) in China, Phytotaxa 567 (3), pp. 233-244 : 238-239

Mucor tofus Y. N. Wang & R. Y. Zheng , sp. nov. Fig. 3

Index Fungorum: IF559755

Etymology:— Referring to the substrate tofu, a soft white or brown food made from soybeans, from which the species was first isolated.

Typification:— CHINA. Anhui Province: Xiuning County, Lantian Town, from raw Mao-tofu , 5 April 2021, Yaning Wang , HMAS 352141 (holotype); prepared from CGMCC 3.16317 (ex-holotype) .

Description: — Colonies on PDA attaining 9 cm diam. and 25 mm in height after 4 days incubation at 24 °C, growing well at 20–26 °C, development ceased at 33 °C or above, deep olive-buff (Ridgway Plate XL); reverse olivebuff (Ridgway Plate XL). Tall sporangiophores arising directly from the substrate, erect, (10–)15–30 µm in diam. and up to 10 mm in length, often with irregular swelling and no septation when young, then smooth and septate with age, with or without yellowish contents, numerous droplets adhering to walls; lateral sporangiophores sympodially branched, (3–)5–10 µm diam. and 80–340 µm long, smooth, with one septum, hyaline. Sporangia globose and multispored, initially yellowish then yellowish-brown, axial ones 70–260 µm, lateral ones 40–100 µm, walls covered with fine spines, breaking. Columellae obovoid, 30–170 × 35–210 µm, pyriform to cylindric, 50–190 × 70–120 µm, mostly hyaline, rarely yellowish. Collars present or absent. Sporangiospores irregular in shape and size, 8–20(–25) × 5–15(– 20) µm when ovoid to cylindrical-ellipsoid, 10–25 × 8–20 µm when irregular, hyaline, smooth. Chlamydospores not observed. Zygospores unknown.

Material examined: — CHINA. Anhui Province: Xiuning County, Lantian Town, from the surface of raw Maotofu , 5 April 2021, Ya-ning Wang, cultures CGMCC 3.16316 and CGMCC 3.16317 .

Figures

FIGURE 3. Morphology of Mucor tofus sp. nov. a, b. Front and reverse of colony on PDA. c, d. Front and reverse of colony on SMA. e. Lateral view of tall sporangiophores. f‒l. Tall and lateral sporangiophores with sporangia. Note that tall sporangiophores are irregular swollen when young. m‒o. Details of lateral sporangia. p‒r. Columellae with or without collars. s. Sporangiospores. Scale bars: e‒i = 500 µm, j‒l = 200 µm, m‒r = 50 µm, s =20 µm.