Cryphonectria quercus C.M. Tian & N. Jiang, 2018

Jiang, Ning, Fan, Xin-Lei, Yang, Qin, Du, Zhuo & Tian, Cheng-Ming, 2018, Two novel species of Cryphonectria from Quercus in China, Phytotaxa 347 (3), pp. 243-250 : 247

Cryphonectria quercus C.M. Tian & N. Jiang , sp. nov., Fig. 3

MycoBank MB 823222

Holotype:— BJFC-S1378 .

Etymology:— quercus , named after the host genus, Quercus .

Host/Distribution:—from Quercus aliena var. acuteserrata in China.

Original description:—Sexual morph: Undetermined. Asexual morph: Conidiomata pseudostromatic, pulvinate, occurring separately, orange to dark orange, semi-immersed in bark, 400–600 μm high, 800–1200 μm diam., with locules often convoluted, several ostioles (mostly 2–6). Conidiophores cylindrical, septate, branched, hyaline, smooth, (6.5–)12–20(–30) μm long, conidiogenous cells 1.5–2 μm wide. Conidia (3.2–)4–5(–5.4) μm × (1.4–)1.6–1.8(–2.1) μm, hyaline, cylindrical, aseptate, exuded as orange droplets.

Cultures:—Culture growing on PDA originally white, becoming faint yellow, with massive sporulation, conidiomata 0.3–1.0 mm, covering a 70 mm diam. plate within 10 days at 25 ° C.

Material examined:— CHINA, Shaanxi Province, Huoditang forest farm, 33°18’22.30”N, 108°35’45.26”E, 1820 m asl, on stems of Quercus aliena var. acuteserrata, Ning Jiang , 27 June 2017 ( BJFC-S 1378, holotype), ex-type living culture, CFCC 52138. Shaanxi Province, Huoditang forest farm, 33°18’22.30”N, 108°35’45.26”E, 1820 m asl, on stems of Quercus aliena var. acuteserrata, Ning Jiang , 27 June 2017 ( BJFC-S 1379, paratype), living culture, CFCC 52139.

Notes:—Two isolates of Cryphonectria quercus cluster in a well-supported clade ( MP / ML / BI =86/100/1) sister to C. japonica . Cryphonectria quercus clade can be distinguished from C. japonica by owning ostioles of conidiomata in the bark, and never colors growth medium purple on MEA like C. japonica ( Table 2).

Figures

FIGURE 3. Morphology of C. quercus from Quercus aliena var. acuteserrata (BJFC-S1378, holotype). A–B: Habit of conidiomata on a stem. C: Transverse sections through conidiomata. D: Longitudinal sections through conidiomata. E: Colonies on PDA. F: conidiomata in culture. G–H: Conidiophores. I–J: conidia. Scale bars:A–F = 0.5 mm; G–J = 10 μm.