Spegazzinia deightonii (S. Hughes) Subram., J. Indian bot. Soc. 35: 78 (1956)

Samarakoon, Binu C., Phookamsak, Rungtiwa, Wanasinghe, Dhanushka N., Chomnunti, Putarak, Hyde, Kevin D., McKenzie, Eric H. C., Promputtha, Itthayakorn, Xu, Jian-Chu & Li, Yun-Ju, 2020, Taxonomy and phylogenetic appraisal of Spegazzinia musae sp. nov. and S. deightonii (Didymosphaeriaceae, Pleosporales) on Musaceae from Thailand, MycoKeys 70, pp. 19-37: 19

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Spegazzinia deightonii (S. Hughes) Subram., J. Indian bot. Soc. 35: 78 (1956)


Spegazzinia deightonii (S. Hughes) Subram., J. Indian bot. Soc. 35: 78 (1956)   Figure 2 View Figure 2


Saprobic on dead leaves of Musa   sp. Sexual morph Undetermined. Asexual morph Hyphomycetous. Sporodochia powder like, dark, dense, dry, 1-3 mm diameter. Conidiophore mother cells 3.5-6.8 × 2.5-5.0 μm (x̄ = 5.59 × 4.15 μm, n = 6), hyaline to light brown, subspherical or doliiform. Conidiophores long or short and give rise to two types of conidia referred here as α and β. Conidiophores of α conidia up to 48-120 × 1-2 μm (x̄ = 95.3 × 1.6 μm, n = 20) long, erect or flexuous, narrow, verruculose, unbranched, hyaline to golden-brown. Conidiophores of β conidia initially hyaline, light brown to brown at maturity, very short and slightly bent, 1.6-2 × 2.5-3 μm (x̄ = 1.8 × 2.6 μm, n =10). Conidiogenous cell development basauxic, forming a single, terminal holoblastic conidium at the apex of conidiophore. Conidial development holoblastic. Conidia two types: α conidia stellate, 18-28 × 17-29 μm (x̄ = 25.1 × 23.3 μm, n = 25), solitary, globose to variously shaped, with spines 4-6 μm long, 4-8-celled, frequently 4- to 6-celled, deeply constricted at the septa. β conidia disc-shaped, initially hyaline, light brown to dark brown at maturity, 8-celled, 16-21 × 11-14 μm (x̄ = 19.2 × 14.6 μm, n = 25), flat from both sides with short and blunt spines, frequently with attached conidiogenous cells when splitting from the conidiophores.

Culture characteristics.

Conidia germinating on PDA within 13-14 h. Colonies growing on PDA, reaching a diameter of 55 mm after 14 d at 25 °C, raised, moderately dense, undulate margin, middle grey, periphery brownish grey and olive green at immature stage; reverse white to greyish white.

Material examined.

Thailand, Chiang Rai Province, Doi Thun, on a dead leaf of Musa   sp. ( Musaceae  ), 7 December 2018, M.C. Samarakoon, BNS 072 ( MFLU 19-2908), living culture MFLUCC 20-0002.


Spegazzinia deightonii   MFLUCC 20-0002 clustered with S. deightonii   (yone 66, yone 212) with significant statistical support (Figure 1 View Figure 1 ). All the strains of S. deightonii   described in Ellis (1971) and Tanaka et al. (2015) have similar morphological features with our strain such as dark brown, 8-celled, disked-shaped, spiny conidia. With morphological and multigene phylogenetic support, we report a new host record of S. deightonii   from Musa   sp.