Togniniales » Togniniaceae » Phaeoacremonium

Phaeoacremonium italicum

Phaeoacremonium italicum A. Carlucci & M.L. Raimondo., in Raimondo et al., Mycologia 106(6), 1123 (2014)

Index Fungorum number: -         Facesoffungi number: FoF01876

 

Associated with stem wilt disease of T. grandis. Sexual morph: Undetermined. Asexual morph: Structures on MEA: Mycelium 1–2.6 μm broad, branched, septate, single or in bundles, partly superficial, partly immersed, hyaline to pale brown, verruculose. Conidiophores up to 40 μm long, 1–2.8 diam, erect to slightly curved, up to 2–3-septate, swollen at the base, tapering at the apex, occasionally bearing 2 lateral phialides next to the terminal phialide, wide, hyaline to pale brown, each newly proliferated segment swollen at the base. Phialides terminal or lateral, mostly monophialidic, occasion- ally polyphialidic; type I phialides (14–)16–19(−26) high × ( 2. 2 –)2 . 3 – 2. 4( − 2. 7)  μ m  ( x =  18 × 2 . 4 μ m ), adelophialide, subcylindrical, no basal septum; type II phialides (14–) 20–24 (−31) high × (1.9–)2.3–2.5(−2.9) μm (x = 20 × 2.4 μm), predominant, elongate-ampulliform attenu- ated at the base to subcylindrical, constricted at the base, ta- pering towards the apex; type III phialides (13–)22–29(−41) high × (2–)2.5–2.7(−3.1)μm (x = 25 × 2.6 μm), subcylindrical to navicular. Conidia (1–)3.6–3.9(−4.7) × (1–)1.5–1.7(−2) μm (x = 3.6 × 1.6 μm, n = 30), allantoid to oblong ellipsoidal, smooth to verrucose, hyaline.

 

Culture characteristics: -

 

Habitat: Known to inhabit Vitis vinifera (Raimondo et al. 2014) and associated with stem wilt disease of T. grandis.

 

Known distribution: Italy (Raimondo et al. 2014) and Thailand.

 

Material examined: Thailand, Chiang Rai Province, Muang District, associated with stem wilt of T. grandis, 25 January 2013, M. Doilom & E. Wongsakul, MFLU 15–3427, dry culture, living culture MFLUCC 13–0336, MKT 104/1,GenBank Accession No: Actin: KU194224, TUB: KU194225.

 

GenBank Accession No: -

 

Notes: It would appear that it is unlikely that Phaeoacremonium italicum (MFLUCC 13–0336) is the same as Pm. italicum as reported in Raimondo et al. (2014) due to differences in host and geography. In addition, it did not pro- duce a yellow pigment on MEA and PDA. Differences are evident also in the conidiophores of Pm. italicum (MFLUCC 13–0336) which are unbranched to branched, but unbranched for ex-type culture (Raimondo et al. 2014). However, the type II phialides in the collections in the present study predominate and the isolate MFLUCC 13–0336 is closely related to Pm. italicum based on DNA sequence data.