Leptosphaeria sydowii
Leptosphaeria sydowii (Boerema, Kesteren & Loer.) Gruyter, Aveskamp & Verkley, in Gruyter et al., Stud. Mycol. 75: 20 (2012) [2013]
= Leptosphaeria ebuli Jayasiri, Camporesi & K.D. Hyde, Fungal Diversity 72: 110 (2015)
Saprobic on dead stem of Petasites sp. (Asteraceae). Sexual morph: undetermined. Asexual morph: Conidiomata 250–400 µm diam., 200–450 µm high, black, pycnidial, solitary to gregarious or confluent, superficial, globose to depressed globose, with flattened base, unilocular, thick-walled, glabrous, smooth, with a distinct rostrate, long neck. Ostiole 100–200 µm long and 30–80 µm wide, subcylindrical to irregular, with a tube-shaped pore, straight or curved, centrally located. Conidiomatal wall 50–100 µm wide, composed of an outer textura globosa to textura angularis with dark brown to brown cells, and an inner textura angularis with hyaline cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 5–8 × 2–6 µm, hyaline, enteroblastic, phialidic, ampulliform to subcylindrical, determinate, with moderate periclinal thickening in the collarette zone, smooth, formed from the inner cavity of the conidiomata. Conidia 4.3–6 × 1.6–3 µm (
= 5 × 2 µm; n = 30), hyaline, cylindrical to subcylindrical, rounded at both ends, unicellular, smooth-walled, guttulate.
Material examined: Italy, Province of Forlì-Cesena, near Monte Falco, on dead aerial stems of Petasites sp. (Asteraceae), 8 April 2015, Erio Camporesi, IT2484 (MFLU 15-1240), (KUN, HKAS 93623).
Notes: Leptosphaeria sydowii was introduced based on Phoma sydowii Boerema, Kesteren & Loer. (de Gruyter et al. 2013). This species is commonly found in Europe and was associated with perennial species of Senecio (Asteraceae) and ?other Asteraceae (Boerema et al. 2004). Leptosphaeria sydowii is characterised by pycnidial, globose to depressed globose conidiomata with flattened base and pronounced cylindrical neck, and hyaline, cylindrical to ellipsoidal conidia. Our collection (MFLU 15-1240) fits well with the description provided by Boerema et al. (2004) and thus represents an additional collection of L. sydowii. The sexual morph of L. sydowii has been linked to L. senecionis (Fuckel) G. Winter, because these two taxa are often associated (Holm 1957, Boerema et al. 2004). In this study, Leptosphaeria sydowii was connected to its sexual morph based on phylogenic analyses (see morphology in Liu et al. 2015).
References:
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.
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