Dendrostoma chinense 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 : 77

Dendrostoma chinense C.M. Tian & N. Jiang sp. nov. Figure 6

Diagnosis.

Dendrostoma chinense differs from D. shandongense by the appearance of conidiomata and is again similar to D. shandongense in its conidial characteristics.

Holotype.

CHINA. Shandong Province: Rizhao City, Donggang District, chestnut plantation, 35°42'28"N, 119°46'23"E, 452 m a.s.l., on branches of Castanea mollissima , 14 Apr. 2017, N. Jiang (holotype: BJFC-S1563; ex-type culture: CFCC 52755).

Etymology.

Chinense, referring to the country, China.

Description.

Sexual morph not observed. Asexual morph: Conidiomata pycnidial, spherical, occurring separately, black, semi-immersed in bark, 250-450 μm high, 600-850 μm diam.; wall of several layers of white textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells lining the inner walls of the cavity, hyaline, smooth, ampulliform, 7-14 × 1-2.5 μm. Conidia hyaline, aseptate, smooth, multiguttulate or not, thin-walled, fusoid to ellipsoid, apex acutely rounded, base truncate, (6.9 –)7.7–9.1(– 9.7) × (3.3 –)3.4–3.7(– 3.9) μm, l/w = (1.9 –)2.2–2.6(– 2.7) (n = 50).

Culture characters.

On PDA, cultures are initially white, becoming olive green in the outer zone after 2 weeks. Colonies are flat with a regular edge; texture uniform within 1 month at 25 °C in the dark.

Additional specimens examined.

CHINA. Shandong Province: Rizhao City, Donggang District, chestnut plantation, 35°42'28"N, 119°46'23"E, 452 m a.s.l., on branches of Castanea mollissima , 14 Apr. 2017, N. Jiang, living culture CFCC 52756 (BJFC-S1564); Hebei Province: Chengde City, chestnut plantation, 40°24'32"N, 117°28'55"E, 262 m a.s.l., on branches of Castanea mollissima , 29 Apr. 2018, N. Jiang & C.M. Tian, living culture CFCC 52757 (BJFC-S1565); Hebei Province: Chengde City, chestnut plantation, 40°24'32"N, 117°28'55"E, 262 m a.s.l., on branches of Castanea mollissima , 29 Apr. 2018, N. Jiang & C.M. Tian, living culture CFCC 52757 (BJFC-S1566).

Notes.

Dendrostoma chinense and D. shandongense have been occasionally discovered on the same branches and share similar conidial shape and dimensions. However, the conidiomatal appearance of these two species is quite different (black conidiomata in Dendrostoma chinense vs. orange conidiomata in D. shandongense ).