Diaporthe conica C.M. Tian & Q. Yang

Yang, Qin, Fan, Xin-Lei, Guarnaccia, Vladimiro & Tian, Cheng-Ming, 2018, High diversity of Diaporthe species associated with dieback diseases in China, with twelve new species described, MycoKeys 39, pp. 97-149 : 97

Diaporthe conica C.M. Tian & Q. Yang sp. nov. Figure 11

Diagnosis.

Diaporthe conica is phylogenetically and morphologically distinct from D. rostrata , in smaller locule and alpha conidia.

Holotype.

CHINA. Zhejiang Province: Tianmu Mountain, on symptomatic branches of Alangium chinense , 20 Apr. 2017, Q. Yang (holotype: BJFC-S1484; ex-type culture: CFCC 52571).

Etymology.

Named after the conical conidiomata.

Description.

Conidiomata pycnidial, 420-580 μm diam., solitary and with single necks erumpent through the host bark. Tissue around the neck is conical. Locule oval, undivided, 385-435 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells unbranched, straight or sinuous, apical or base sometimes swelling, 19-23.5 × 2.8 μm. Alpha conidia hyaline, aseptate, ellipsoidal, biguttulate, 5.5-7 × 2.3-3 μm (av. = 6.5 × 2.6 μm, n = 30). Beta conidia not observed.

Culture characters.

Cultures incubated on PDA at 25 °C in darkness. Colony white to yellowish, with dense and felted mycelium, lacking aerial mycelium, with maize-coloured conidial drops exuding from the ostioles.

Additional material examined.

CHINA. Zhejiang Province: Tianmu Mountain, on symptomatic branches of Alangium chinense , 20 Apr. 2017, Q. Yang, living culture CFCC 52572 (BJFC-S1485); ibid. living culture CFCC 52573 (BJFC-S1486); ibid. living culture CFCC 52574 (BJFC-S1487).

Notes.

Four isolates clustered in a clade distinct from further Diaporthe species based on DNA sequence data. Morphologically, this species is characterised by conical conidiomata, which is similar with D. rostrata from Juglans mandshurica . However, D. conica differs from D. rostrata by having smaller locule and alpha conidia (310-385 vs. 620-1100 μm in locule; 5.5-7 × 2.3-3 vs. 8.5-11.5 × 4-5 μm in alpha conidia) ( Fan et al. 2015).