Diaporthecaryae differs from its closest phylogenetic neighbour, D.charlesworthii and D.sackstonii, in ITS, tef1 and tub2 loci based on the alignments deposited in TreeBASE.

CHINA. Jiangsu Province: Nanjing city, on symptomatic twigs of Caryaillinoensis, 10 Nov. 2015, Q. Yang (holotype: BJFC-S1476; ex-type culture: CFCC 52563).

Named after the host genus on which it was collected, Carya.

Conidiomata pycnidial, immersed in bark, scattered, slightly erumpent through the bark surface, nearly flat, discoid, with a solitary undivided locule. Ectostromatic disc brown to black, one ostiole per disc. Locule undivided, 310–325 μm diam. Conidiophores 7–11 × 1.4–2.2 μm, cylindrical, phialidic, unbranched, sometimes inflated. Alpha conidia hyaline, aseptate, ellipsoidal or fusiform, eguttulate, obtuse at both ends, 7–8.5 × 2.1–2.5 μm (av. = 8 × 2.3 μm, n = 30). Beta conidia hyaline, aseptate, filiform, straight or hamate, eguttulate, base subtruncate, tapering towards one apex, 15.5–34 × 1.1–1.4 µm (av. = 27.5 × 1.2 µm, n = 30).

Cultures incubated on PDA at 25 °C in darkness. Colony at first flat with white felty mycelium, becoming black in the centre and black at the marginal area with age, conidiomata not observed.

CHINA. Jiangsu Province: Nanjing city, on symptomatic twigs of Caryaillinoensis, 10 Nov. 2015, Q. Yang, living culture CFCC 52564 (BJFC-S1477).

Two strains representing D.caryae cluster in a well-supported clade and appear closely related to D.charlesworthii and D.sackstonii. Diaporthecaryae can be distinguished based on ITS, tef1 and tub2 loci from D.charlesworthii (50/468 in ITS, 107/338 in tef1 and 90/707 in tub2); from D.sackstonii (4/440 in ITS, 13/340 in tef1 and 23/701 in tub2). Morphologically, D.caryae can be distinguished from D.charlesworthii by its shorter conidiophores (7–11 vs. 15–35 μm); from D.sackstonii by its longer alpha conidia (7–8.5 vs. 6–7 μm) (Thompson et al. 2015).