Dendrostoma qinlingense C.M. Tian & N. Jiang

Jiang, Ning, Fan, Xin-Lei, Crous, Pedro W. & Tian, Cheng-Ming, 2019, Species of Dendrostoma (Erythrogloeaceae, Diaporthales) associated with chestnut and oak canker diseases in China, MycoKeys 48, pp. 67-96 : 82-83

Dendrostoma qinlingense C.M. Tian & N. Jiang sp. nov. Figure 9

Diagnosis.

Dendrostoma qinlingense produces the largest conidia amongst known species of the genus.

Holotype.

CHINA. Baoji City, Mei County, Taibai Mountain, 34°15'43"N, 107°88'42"E, 2752 m a.s.l., on branches of Quercus wutaishanica , 13 Jul. 2017, N. Jiang (holotype: BJFC-S1539; ex-type culture: CFCC 52732).

Etymology.

Qinlingense, referring to the Qinling Mountain.

Description.

Sexual morph not observed. Asexual morph: Conidiomata pycnidial, conical to pulvinate, occurring separately, dark yellow, semi-immersed in bark, 400-700 μm high, 1100-1600 μm diam.; wall of several layers of bright yellow textura angularis; central column beneath the disc conical, dark orange. Conidiophores reduced to conidiogenous cells. Conidiogenous cells lining the inner walls of the cavity, hyaline, smooth, ampulliform, 6-22 × 2-3.5 μm. Conidia hyaline, aseptate, smooth, multiguttulate, thin-walled, fusoid, straight, (15.6 –)16–18(– 18.6) × (3.1 –)3.3–3.7(– 3.8) μm, l/w = (4.2 –)4.4–5.2(– 5.8) (n = 50).

Culture characters.

On PDA, cultures are initially white, exhibiting light grey after 2 weeks. The colonies are flat with irregular edge; texture uniform, producing concentric circles with sparse conidiomata irregularly distributed on the centre of the plate within 1 month at 25 °C in the dark.

Additional specimen examined.

CHINA. Shaanxi Province: Baoji City, Mei County, Taibai Mountain, 34°15'43"N, 107°88'42"E, 2752 m a.s.l., on branches of Quercus aliena var. acutiserrata , 13 Jul. 2017, N. Jiang, living culture CFCC 52733 (BJFC-S1540).

Notes.

Dendrostoma qinlingense was discovered on two Quercus species on the Qinling Mountain in northwest China. This species is phylogenetically related to Dendrostoma osmanthi on Osmanthus fragrans . However, Dendrostoma qinlingense differs from D. osmanthi by much larger conidia (16-18 × 3.3-3.7 μm in D. qinlingense vs. 7.5-10 × 2-2.5 μm in D. osmanthi ).