Myrmecridium schulzeri (Sacc.) Arzanlou, W. Gams & Crous

Wijayawardene, Nalin N., Dissanayake, Lakmali S., Li, Qi-Rui, Dai, Dong-Qi, Xiao, Yuanpin, Wen, Ting-Chi, Karunarathna, Samantha C., Wu, Hai-Xia, Zhang, Huang, Tibpromma, Saowaluck, Kang, Ji-Chuan, Wang, Yong, Shen, Xiang- Chun, Tang, Li-Zhou, Deng, Chun-Ying, Liu, Yanxia & Kang, Yingqian, 2021, Yunnan-Guizhou Plateau: a mycological hotspot, Phytotaxa 523 (1), pp. 1-31 : 15-17

Myrmecridium schulzeri (Sacc.) Arzanlou, W. Gams & Crous ,

Stud. Mycol. 58: 84 (2007)

( FIGURE. 9 )

Index Fungorum Number: IF504560

Saprobic on submerged decaying wood. Sexual morph undetermined. Asexual morph Colonies on natural substrata effuse, superficial, scattered, hairy, solitary or in small groups, black, with a mass of visible whitish to grayish conidia on middle to upper part of conidiophores. Mycelium partly superficial, partly immersed. Conidiophores macronematous, mononematous, straight to slightly curve, unbranched, medium brown to brown at base part, pale towards top part, thin-walled, septate, 172–304 × 2–3 μm (= 212 × 2.6 μm, n = 15). Conidiogenous cells holoblastic, polyblastic, integrated, terminal and intercalary, cylindrical, subhyaline to pale brown, forming a rachis with scattered pimpleshaped denticles which are less than 1 µm long and approx. 0.5 µm in diameter. Conidia solitary, fusoid or ellipsoidal to obovoidal, rounded at the apex, obtuse and tapering towards base, hyaline, aseptate, thin-walled, smooth, without guttule, some with a small protuberance, 5–6.5 × 2.3–3.6 μm (= 5.8 × 2.9 μm, n = 35).

Culture characteristics:— Conidia germinating on PDA within 24h. Colonies grow on PDA attaining 38–48 mm diameter in 40d at 20–25°C in the condition of 12h-dark and 12h-light, with smooth, floccose, pale brown mycelium on the surface, reverse white, with filamentous, undulate margin.

Material examined: China, Yunnan Province, small river of Puzhehei , on dead submerged decaying wood of unidentified plants, 23 June 2018, Hao Yang, P37 ( IFRD500–012 ), living culture = KUMCC 20–0190 (new record from Yunnan, new habitat record) .

Known hosts and distribution: Soil ( Germany, Papua New Guinea, Zaire), Homo sapiens ( Netherlands) , Wheat straw ( South Africa), Triticum aestivum ( Netherlands) , Malus sylvestris ( Switzerland) , Cannomois virgate ( South Africa)

GenBank Numbers: ITS MT559103

Notes:— Myrmecridium was introduced by Arzanlou et al. (2007) with M. schulzeri as type species, which was described as Chloridium schulzerii (Sacc.) Sacc. and Rhinocladiella schulzeri (Sacc.) Matsush. Our isolate fits the characters of Myrmecridium well in having macronematous, unbranched, septate conidiophores, polyblastic conidiogenous cells with denticles, and hyaline, thin-walled, smooth, fusoid or ellipsoidal to obovoidal conidia ( Arzanlou et al. 2007, Jie et al. 2013, Peintner et al. 2016, Réblová et al. 2016). The sequence data in ITS gene region of our isolate are identical to that of M. schulzeri . Thus, we identified our isolate as M. schulzeri . Our isolate is a new geographic record in China and a new habitat record from freshwater.

Figures

FIGURE. Myrmecridium schulzeri (IFRD500–012) a, b. Colonies on natural substrate. c–e. Conidiophores with conidia. f, g. Conidiogenous cells with conidia. h–l. Conidia. m Germinating conidia on PDA. n, o. Culture on PDA, n. from front, o. from reverse. Scale bars: c–e, h = 20 μm, m = 10 μm, f, g = 5 μm, i–l = 2 μm.