Botryosphaeriales » Botryosphaeriaceae » Pseudofusicoccum

Pseudofusicoccum adansoniae

Pseudofusicoccum adansoniae Pavlic et al., Mycologia 100(6): 855 (2008)

Facesoffungi number: FoF00168

 

Sexual morph: Undetermined. Asexual morph: Conidiomata (60–) 100–115 (–145) μm high × (85–) 115–125 (–145) μm diam. (x̄ = 100 × 115 μm n = 10), pycnidial, black, solitary or scattered, immersed to semi-immersed, globose to subglobose, uniloculate, with a central ostiole. Ostiole periphysate, necks 30–40 μm long, 25–45 μm diam. Conidiomata wall 15–30 μm wide, outer layers dark brown to black, inner layers thin-walled, pale brown to hyaline, composed of 4–6 cell layers of textura angularis. Paraphyses not observed. Conidiogenous cells (6–) 10.5–15.5 (–18) × (3.5–) 5–6 (–8) μm (x̄ = 11.5 × 5.3 μm n = 15), holoblastic, cylindrical to ellipsoidal, hyaline, smooth-walled. Conidia (20–) 27.5–29.5 (–39) × 6–10 μm (x̄ ± S.D. = 28 ± 4 × 8 ± 1.0 μm n = 40), fusiform to ellipsoidal, hyaline, aseptate, slightly bent or irregularly shaped, smooth-walled, with fine granular content, apex broadly rounded, base rounded to truncate, covered with a persistent mucus layer.

Culture characteristics: Conidia germinating on PDA after 24 h. Germ tubes produced from the ends of the conidia. Colonies on MEA reaching 45 mm diameter after 2 days at the dark at 25 °C, initially whitened, after 3 days become greenish-grey (26F2) at the centre, white at the edge, fast growing, raise, fluffy, dense, filamentous, undulate, convex with papillate surface, reaching the edge the Petri-dish after 4 days.

Material examined: Thailand, Chiang Rai Province, Muang District, associated with leaf spot of Tectona grandis, 17 July 2013. M. Doilom (living culture MFLUCC 13-0705, MUCL 55413, MFLUCC 14-0516 and MFLUCC14-0517).

Notes: Conidia of P. adonsoniae collected in the current study are longer and wider (28 × 8 μm versus 22.5 × 5.2 μm), than those reported by Pavlic et al. (2008) for the type. This may be due to difference substrates and lifestyle as isolates in current study were associated with leaf spots and observed directly on the host, while those from the type were isolated from asymptomatic twigs on Adansonia gregorii (Pavlic et al. 2008) with characters observed in culture on pine needles.

Figure X. Pseudofusicoccum adansoniae (MFLU 15-0731) a, b. Leaf spot on T. grandis with associated conidiomata. c. Section through conidioma. d–f. Conidia attached to conidiogenous cells. g–o. Conidia. Scale bars: a=1000 μm. b=300 μm.c=30 μm. d=20 μm. e, g–o=10 μm. f=5 μm.

Reference: Doilom M, Shuttleworth LA, Roux J, Chukeatirote E, et al. (2015) Botryosphaeriaceae associated with Tectona grandis (teak) in Northern Thailand. Phytotaxa 233: 001–026.

 

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