Diaporthe pescicola Dissanayake, X.H. Li & K.D. Hyde, sp. nov., Index fungorum number: IF 551988
Etymology: pesca, referring to peach in Italian.
Pathogenic on Prunus persica shoots. Sexual morph: Not observed. Asexual morph: Conidiomata up to 300 mm in diam., superficial, solitary, scattered on PDA, globose, dark brown to black, clustered in groups of 2-5 pycnidia. Conidiophores 21–35×1.5–2.5 μm (x̅ = 27 × 2 μm), cylindrical, aseptate, densely aggregated, straight or sinuous, terminal, slightly tapered towards the apex. Alpha conidia 6–8.5 ×2–3 μm ( x̅ = 8 × 3 μm) hyaline, biguttulate, fusiform or oval, both ends obtuse. Beta conidia 18–37 ×1–1.5 μm (x̅ = 27 × 1.5 μm) hyaline, aseptate, filiform, hamate, guttulate, tapering towards both ends.
Culture characteristics: Colonies on PDA covering entire Petri dishes after 10 days, grey, with scant aerial mycelium; reverse fuscous black.
Material examined: CHINA, Hubei Province, on diseased shoots of P. persica (Rosaceae), May 2015, XingHong Li; (MFLU 16-0906, holotype); ex-type living culture MFLUCC 16-0105 = CGMCC3.17465.
Notes: Diaporthe pescicola occurs in a clade separate from D. arecae H.C. Srivast., Zakia & Govindar., D. pterocarpicola Udayanga, X.Z. Liu and K.D. Hyde and D. pseudophoenicicola Gomes, C. Glienke & Crous. Diaporthe pescicola differs from D. arecae, D. pterocarpicola and D. pseudophoenicicola in the presence of beta conidia. Phylogenetically, D. pseudophoenicicola is the closest species to D. pescicola, differing by 47 nucleotides in the concatenated alignment, in which 5 were distinct in the ITS region, 14 in the EF1-α region, 16 in the BT region and 12 in the CAL region.
Fig. Diaporthe pescicola (ex-type MFLUCC 16-0105) F, G. Culture on PDA after 2 weeks. H. Conidial ooze. I. Conidiophores. J. Alpha conidia. K. Beta conidia. Scale bars: H=200 μm, I=20 μm, J,K=10 μm.
