Thyronectria pinicola (Kirschst.) Jaklitsch & Voglmayr, Persoonia 33: 203, 2014.

Yang, Qin, Chen, Wen-Yan, Jiang, Ning & Tian, Cheng-Ming, 2019, Nectria-related fungi causing dieback and canker diseases in China, with Neothyronectriacitri sp. nov. described, MycoKeys 56, pp. 49-66 : 49

Thyronectria pinicola (Kirschst.) Jaklitsch & Voglmayr, Persoonia 33: 203, 2014. Figure 5

Basionym.

Pleonectria pinicola Kirschst., Abh. Bot. Ver. Prov. Brandenburg 48: 59, 1906.

Description.

Stromata erumpent through epidermis, orange to red. Pycnidia solitary or aggregated in groups of 3-6, superficial on stroma or rarely immersed at base, subglobose, smooth to slightly roughened, cerebriformis or slightly cupulate upon drying, 225-400 μm high, 240-440 μm diam., red to bay, KOH+ slightly darker, LA+ slightly yellow. Pycnidial wall 16-40 μm thick, of two regions: outer region 11-15 μm thick, intergrading with stroma, cells forming textura globulosa or t. angularis, walls pigmented, about 1.5 μm thick; inner region 10-24 μm thick, of elongate, thin-walled, hyaline cells, forming textura prismatica. Conidiophores densely branched, generally with 1-3 branches, 8.5-24 μm long, 1.3-1.5 μm wide. Conidiogenous cells cylindrical monophialides on aerial, submerged or repent hyphae. Conidia formed abundantly on slimy heads, ellipsoidal to oblong, hyaline, straight, rounded at both ends, non-septate, (2 –)3– 3.5 × 0.7-1.0 μm (n = 20), smooth-walled.

Culture characters.

Cultures incubated on PDA at 25 °C in darkness. Colony surface cottony with aerial mycelium, becoming yellowish-brown due to pigment formation, small reddish-brown sporodochial conidial masses produced after 3-4 wk.

Specimens examined.

CHINA. Beijing: Chaoyang District, 40°00'35.31"N, 116°47'55.32"E, on symptomatic branches of Pinus sylvestris Linn. var. mongolica Litv., 11 June 2018, Q. Yang & N. Jiang (BJFC-S1773, living culture CFCC 53593 and CFCC 53594).

Note.

The hosts of Thyronectria pinicola , synonymised with Pleonectria pinicola , are restricted to Pinus . Members of the genus distributed in Asia (China, Japan, Pakistan), Australia, Europe (Germany, Russia), North America (USA) and South America (Chile) ( Jaklitsch and Voglmayr 2014). The asexual morph of T. pinicola in the natural environment has long, sterile hyphae extending from the hymenium and abundant conidiophores (Figs 4 E–G). In the present study, two isolates from twigs of Pinus sylvestris var. mongolica were congruent with T. pinicola , based on morphology and DNA sequences data (Fig. 1). We therefore describe T. pinicola as a known species for this clade.