Tiania chinensis Ning Jiang, 2025

Jiang, Ning, Xue, Han & Li, Yong, 2025, Novel genus and species of Diaporthostomataceae (Diaporthales) in China, IMA Fungus 16, pp. e 145422-e 145422 : e145422-

Tiania chinensis Ning Jiang sp. nov.

Figs 3 , 4

Etymology.

Named after the collection country of the type specimen, China.

Diagnosis.

Distinct from its phylogenetically related species T. lithocarpicola by longer conidia.

Typus.

CHINA • Xizang Autonomous Region, Rikaze City, Jilong County, Jilong Town, Rema Village , on diseased branches of Quercus semecarpifolia , 20 August 2022, Ning Jiang, Min Liu & Peng Jin (holotype CAF 800088 ; ex-holotype culture CFCC 59134 ) ; • Xizang Autonomous Region, Linzhi City, Gongbujiangda County, Gongbujiangda Town , on diseased branches of Quercus spinosa , 7 July 2024, Ning Jiang, Jiangrong Li, Jieting Li & Liangna Guo (paratype CAF 800141 ; ex-paratype culture CFCC 71190 ) .

Description.

Pseudostromata immersed to semi-immersed in the bark, scattered, conical, 630–1240 μm diam, 330–480 μm high, with 5–10 perithecia arranged irregularly. Ectostromatic disc grey to brown, circular to ovoid, 300–470 μm diam. Ostioles brown to black, 90–150 μm diam. Perithecia flask-shaped to spherical, 490–620 μm diam. Asci hyaline, with chitinoid, refractive ring, clavate to elongate-obovoid, (38.5 –) 41.5–47.5 (– 52) × (7 –) 8–9.5 (– 10) μm, 8 - spored. Ascospores biseriate, cylindrical to allantoid, thin-walled, hyaline, 0–1 septate, (11 –) 11.5–14.5 (– 15) × (2.5 –) 3–3.5 (n = 50) μm, L / W ratio = 3.7–5. Conidiomata acervular, aggregated, immersed to semi-immersed in the bark, pulvinate, dark brown to black, 250–600 μm high, 350–1000 μm diam. Conidiophores indistinct, usually reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, cylindrical, phialidic, 9.2–14.5 × 2–2.9 μm. Conidia aseptate, hyaline, smooth, multi-guttulate, cylindrical to allantoid, straight or slightly curved, (7.5 –) 8–9 (– 10) × (2 –) 2.5–3 (– 3.5) μm (n = 50), L / W = 2.7–3.6.

Culture characteristics.

Colonies on PDA flat, spreading, with abundant flocculent aerial mycelium and even margin, white to sky grey, reaching 90 mm diam after 2 wk at 25 ° C. Colonies on MEA flat, spreading, lavender grey to grey olivaceous, reaching 90 mm diam after 2 wk at 25 ° C. Colonies on SNA flat, spreading, with sparse flocculent aerial mycelium and feathery margin.

Additional material examined.

CHINA • Xizang Autonomous Region, Rikaze City, Jilong County, Jilong Town, Rema Village , from cankered barks of Quercus semecarpifolia , 21 August 2022, Ning Jiang, Min Liu & Peng Jin (living culture CFCC 59135 ) .

Distribution.

China, Xizang Autonomous Region.

Ecology.

Associated with branch canker disease with Quercus semecarpifolia and Q. spinosa .

Notes.

Three isolates obtained from diseased branches of Quercus semecarpifolia and Q. spinosa formed a distinct clade, separate from Tiania lithocarpicola and T. quercicola , and are identified as T. chinensis sp. nov. This species can be distinguished from T. lithocarpicola by its longer conidia (8–9 × 2.5–3 μm in T. chinensis vs. 5–6.5 × 2–2.5 μm in T. lithocarpicola ) and from T. quercicola by its cylindrical to allantoid conidia.

Figures

Figure 3. Tiania chinensis sp. nov. from Quercus spinosa (CAF 800141). A, B Habit of ascostromata on branch; C, D transverse section through ascostroma; E longitudinal section through ascostroma; F asci; G ascospores. Scale bars: 500 μm (B – E); 20 μm (F); 10 μm (G).

Figure 4. Tiania chinensis sp. nov. from Quercus semecarpifolia (CAF 800088). A, C Habit of conidiomata on branch; B transverse section through conidioma; D longitudinal section through conidioma; E conidiogenous cells with attached conidia; F, G conidia. Scale bars: 500 μm (A); 200 μm (B, C); 100 μm (D); 10 μm (E – G).