Cryphonectria quercicola 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 : 246-247

Cryphonectria quercicola C.M. Tian & N. Jiang , sp. nov., Fig. 2

MycoBank MB 823221

Holotype:— BJFC-S1376 .

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

Host/Distribution:—from Quercus wutaishansea in China.

Original description:—Sexual morph: Undetermined. Asexual morph: Conidiomata pseudostromatic, globose, pulvinate, occurring separately, dark orange, semi-immersed in bark, 400–600 μm high, 500–900 μm diam., with locules often convoluted, several ostioles (mostly 6–10). Conidiophores cylindrical, septate, branched, hyaline, smooth, (10–)15–30(–40) μm long, conidiogenous cells 2–3 μm wide. Conidia hyaline, cylindrical, aseptate, (3.2–)3.5–4(–5) μm × (1.4–)1.7–1.8(–2) μm, exuded as orange droplets.

Cultures:—Culture growing on PDA originally white, becoming yellow, with massive sporulation, conidiomata 0.15–0.75 mm, covering a 70 mm diam. plate within 10 days at 25 ° C.

Material examined:— CHINA, Shaanxi Province, Mountain Taibai, 34°15’43.32”N, 107°88’42.16”E, 2752 m asl, on stems of Quercus wutaishansea, Ning Jiang , 13 July 2017 ( BJFC-S 1376, holotype), ex-type living culture, CFCC 52140. Shaanxi Province, Mountain Taibai, 34°15’43.32”N, 107°88’42.16”E, 2752 m asl, on stems of Quercus wutaishansea, Ning Jiang , 13 July 2017 ( BJFC-S 1377, paratype), living culture, CFCC 52141.

Notes:—Two isolates of C. quercicola cluster in a well-supported clade ( MP / ML / BI =87/100/1) and appeared closely related to C. quercus from Quercus aliena var. acuteserrata . Cryphonectria quercicola differs from C. quercus in shorter conidia (3.5–4 μm in C. quercicola vs. 4–5 μm in C. quercus ) and conidiomata on PDA (yellow, gregarious conidiomata of C. quercicola vs. orange, scattered conidiomata of C. quercus ).

Figures

FIGURE 2. Morphology of C. quercicola from Quercus wutaishansea (BJFC-S1376, holotype). A–B: Habit of conidiomata on a branch. C: Transverse sections through conidiomata. D: Longitudinal sections through conidiomata. E: Colonies on PDA. F: conidiomata in culture. G–H: Conidiophores. I: conidia. Scale bars: A–F = 0.5 mm; G–I = 10 μm.