Dendrostoma shaanxiense C.M. Tian & N. Jiang
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publication ID |
https://dx.doi.org/10.3897/mycokeys.48.31715 |
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persistent identifier |
https://treatment.plazi.org/id/3BF167DB-DC77-F04B-1A0E-48F4B65E3765 |
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treatment provided by |
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scientific name |
Dendrostoma shaanxiense C.M. Tian & N. Jiang |
| status |
sp. nov. |
Dendrostoma shaanxiense C.M. Tian & N. Jiang sp. nov. Figure 11
Diagnosis.
Dendrostoma shaanxiense is distinguished from the closely related species D. castaneae by smaller l/w ratio and from D. castaneicola by its narrower conidia.
Holotype.
CHINA. Shaanxi Province: Ankang City, Xiangxidong Park, 32°40'32"N, 109°18'57"E, 1079 m a.s.l., on branches of Castanea mollissima , 1 Jul. 2017, N. Jiang (holotype: BJFC-S1549; ex-type culture: CFCC 52741).
Etymology.
Shaanxiense, referring to the Shaanxi Province in China.
Description.
Sexual morph not observed. Asexual morph: Conidiomata pycnidial, conical to pulvinate, occurring separately, dark orange, semi-immersed in bark, 350-650 μm high, 1050-1400 μm diam.; wall of several layers of bright yellow textura angularis; central column beneath the disc conical, bright yellow. Conidiophores reduced to conidiogenous cells. Conidiogenous cells lining the inner walls of the cavity, hyaline, smooth, subcylindrical to ampulliform, 5-11 × 2.5-3.5 μm. Conidia hyaline, aseptate, smooth, multiguttulate, thin-walled, ellipsoid to fusoid, straight to curved, (8.6 –)9.5–11.1(– 11.7) × (2.3 –)2.5–3.1(– 3.4) μm, l/w = (2.8 –)3.3–4.2(– 4.9) (n = 50).
Culture characters.
On PDA, cultures are initially white, turning purple after 2 weeks on PDA. The colonies are flat with irregular edge; texture uniform, producing concentric circles within 1 month at 25 °C in the dark.
Additional specimen examined.
Shaanxi Province: Ankang City, Xiangxidong Park, 32°40'32"N, 109°18'57"E, 1079 m a.s.l., on branches of Castanea mollissima , 1 Jul. 2017, N. Jiang, CFCC 52742 (BJFC-S1550).
Notes.
Dendrostoma shaanxiense , D. castaneae and D. castaneicola are phylogenetically closely related species occurring on the same host, Castanea mollissima (Fig. 2). However, Dendrostoma shaanxiense has conidia with a smaller l/w ratio than D. castaneae (3.3-4.2 in D. shaanxiense vs. 4.2-5.2 in D. castaneae ) and has narrower conidia than D. castaneicola (2.5-3.1 μm diam. in D. shaanxiense vs. 3.2-3.8 μm diam. in D. castaneicola ).
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