Pleosporales » Pleosporaceae » Alternaria

Alternaria cesenica

Alternaria cesenica Phukhams., Qing Tian, Camporesi & K.D. Hyde, in Liu et al., Fungal Diversity: 10.1007/s13225-015-0324-y, [148] (2015)

Index Fungorum number: IF 550899; Facesofungi number: FoF 00408

Etymology: The specific epithet Cesenica refers to the place in which the fungus was first collected.

Holotypus: MFLU 14-0795

Saprobic on dead branch of Bellevalia romana (L.) Sweet. Sexual morph: Ascomata 100–200 μm high, 84–225 μm diam. (x̄ =170 ×160 μm, n = 10), on the surface of the host, solitary, scattered, or sometimes gregarious, globose, superficial, black, smooth. Peridium 22–33.5 μm (x̄ = 28.5 μm, n = 6), at the outside composed of irregular, thick-walled, brown to black cells of textura angularis, inner layer composed of slightly, smaller cells of textura angularis. Asci 68–104 × 11–14 μm (x̄ = 85 × 12 μm, n = 10), 6–8-spored, bitunicate, clavate to subellipsoid, short pedicellate, apically rounded, with an ocular chamber. Hamathecium comprising 1–2μm broad, septate, long, branched or simple, pseudoparaphyses. Ascospores 16–23 × 8–10 μm (x̄ = 19 × 9 μm, n = 10), uniseriate or overlapping uniseriate, ellipsoid to fusiform, muriform, dark brown to blackish-brown, constricted at the center, lower cell narrow and longer, smooth-walled. Asexual morph: Undetermined.

Culture characters: Colonies on PDA, reaching 2 cm diam. after 2 weeks at 16 °C, later with dense mycelium, circular, margin rough, white, surface flat, without aerial mycelium. Hyphae septate branched, hyaline, thin.

Material examined: ITALY, Forlì-Cesena Province: Fiumana, Predappio, dead and hanging branches of Bellevalia romana (Asparagaceae), 7 February 2013, E. Camporesi IT1052 (MFLU 14-0795, holotype); ex-type living culture, MFLUCC 13-0450

GenBank: ITS: KP711383, LSU: KP711384, SSU: KP711385, TEF: KP711386.

            Notes: Alternaria is a genus of pathogenic and saprobic taxa (Woudenberg et al. 2013). The genus was originally introduced by Nees (1816) as Alternaria tenuis, which is currently treated as a synonym of Alternaria alternate (Woudenberg et al. 2013). Comoclathris has been reported as a sexual morph of Alternaria and has muriform, yellowish to dark brown ascospores. Comoclathris clusters within

Alternaria in phylogenetic analyses (Woudenberg et al. 2013). Molecular analysis provides evidence that Alternaria cesenica is a new species grouping in section infectoriae (Liu et al. 2015). The sexual morph is rarely found in Alternaria.