Paramicrosphaeropsis amygdalus M.Mehrabi-Koushki, S.Artand, K.D.Hyde & Jayaward., 2022

Artand, Saeid, Mehrabi-Koushki, Mehdi, Tabein, Saeid, Hyde, Kevin D. & Jayawardena, Ruvishika S., 2022, Revision of the Microsphaeropsis complex with addition of four new Paramicrosphaeropsis L. W. Hou, L. Cai & Crous species from Zagrosian forest trees in Iran, Cryptogamie, Mycologie 20 (7), pp. 159-175 : 166

Paramicrosphaeropsis amygdalus M.Mehrabi-Koushki, S.Artand, K.D.Hyde & Jayaward. , sp. nov.

( Fig. 2 )

HOLOTYPE. — Iran. Khuzestan Province, Dezful, Shahiyoon (forest mountains of Segeryoo), from stem canker of Amygdalus scoparia, I.2019, S. Artand (holo-, IRAN [18146F]; ex-type living culture, IRAN [4451C] = SCUA-Ar-KS3-3).

ADDITIONAL SPECIMENS EXAMINED. — Iran. Khuzestan Province, Dezful, Sardasht (forest mountains of Saland-Kooh), from stem canker of Amygdalus scoparia, III.2021, S. Artand ( IRAN [4452C] = SCUA-Ar-SB2A); from leaf spot of an unknown tree, III.2021, S. Artand (SCUA-Ar-S6A).

ETYMOLOGY. — The name refers to the host genus Amygdalus L. from which it was isolated.

MYCOBANK. — MB 841492.

DESCRIPTION

Asexual morphology

Pycnidia scattered and irregular, solitary or aggregated, superficial on the medium or in aerial mycelium, globose to subglobose, sometime with a short neck, covered with hyphal outgrowths, usually inconspicuous ostiole, sometime with a conspicuous ostiole, slightly papillate or non-papillate, brown to dark brown with a paler wall, (107.2-)159.6-186.6(-268) × (102.2-)144.1-166.4(-241.2) µm, (x ± SD = 173.7 ± 6.7 × 155.6 ± 5.7 µm, n = 50). Pycnidial wall pseudoparenchymatous, composed of isodiametric to elongated cells, 3-6 layers, pale brown to brown, outer layers darker. Conidiogenous cells phialidic, hyaline, smooth-walled, discrete, ampulliform or doliiform. Conidia mostly ovoid to ellipsoidal but also allantoid, or irregular in shape, pale brown to brown, straight or curved, smooth- and thin-walled, guttulate, aseptate, (3.7-)5.9-6.9(-10.5) × (3.2-)4.0-4.3(-5.8) µm, (x ± SD = 6.3 ± 0.3 × 4.2 ± 0.1 µm, n = 50). Chlamydospores and swelling cells not observed.

Sexual morphology

Not observed.

Figures

FIG. 2. — Paramicrosphaeropsis amygdalus M.Mehrabi-Koushki, S.Artand, K.D.Hyde & Jayaward., sp. nov.(holo-, IRAN[17595F]): A, B, eight-days colony on OA (top and reverse); C, D, old colony on OA (top and reverse); E, F, old colony on PDA (top and reverse); G-I, pycnidia; J, pycnidium extruding conidia; K, pycnidal wall; L, conidiogenous cells; M, conidia. Scale bars: G, 500 µm; H, 200 µm; I, 105 µm; J, 50 µm; K-M, 20 µm.