Diaporthales » Asterosporiaceae » Asterosporium

Asterosporium acerinum

Asterosporium acerinum Wijayaw., Camporesi, McKenzie, K. Tanaka & K.D. Hyde, in Wijayawardene et al., Fungal Diversity: 10.1007/s13225-016-0360-2, [49] (2016)

Index Fungorum number: IF 551763; Facesofungi number: FoF 01431

Etymology: Named after the host genus.

Holotype: MFLU 15-3412.

Saprobic on branches of Acer opalus (Sapindaceae). Sexual morph: Undetermined. Asexual morph: Conidiomata 130–160 μm diam., 70–110 μm high, acervular, immersed, erumpent at maturity, solitary, subglobose, unilocular, dark brown. Conidiomatal wall multi-layered, composed of thin-walled, brown cells of textura angularis, inner wall thin, hyaline. Conidiophores 15–35 × 2–4 μm, cylindrical, septate, only branched at the base, hyaline to pale brown, formed from the upper pseudoparenchyma, smooth-walled. Conidiogenous cells holoblastic, lacking percurrent proliferation, integrated, determinate, cylindrical, simple, hyaline to pale brown, smooth-walled. Conidia 35–50 × 42–50 μm (x̄ = 39.4 × 45.4 μm, n = 20) between the widest points, stellate, terminal, transversely distoseptate, constricted at the septa, lumina reduced, pale brown to brown, apical cell of each arm hyaline, consisting of 4 arms at 90° to each other, connected to the conidiogenous cell at the point where they meet, smooth-walled.

Material examined: Italy, Firenze [FI] Province, Vallombrosa, on dead branch of Acer opalus (Sapindaceae), 5 June 2012, Erio Camporesi, IT 406 (MFLU 15-3412, holotype); (HKAS 92542, isotype).

GenBank:

Notes: Only Asterosporium attenuatum has been recorded from Acer spp. (from Acer campestris) (Sutton 1980, Ellis and Ellis 1985, Murvanishvili and Dekanoidze 1992, Farr and Rossman 2016, Index Fungorum 2016). The conidia of A. acerinum are similar in shape to those of A. attenuatum, but they are smaller (35–50 × 42–50 μm vs . 57–84 × 21–24 μm). The conidiophores of A. acerinum are also smaller, than those of A. attenuatum (60–80 × 5.6 μm vs. 15–35 × 2–4 μm). Several attempts of single conidial isolation were not successful. Moreover, we carried out direct sequencing but thesequence data composed with several bands (Wijayawardene et al. 2016).

 

Figure x. Asterosporium acerinum (holotype). a, b Conidiomata on Acer opalus. c Vertical section of a conidioma. d–g Different stages of conidiogenesis. h–n Conidia. Scale bars: c=50 μm, d, e=10 μm, f–k=20 μm.

 

References:

 

Ellis MB, Ellis JP 1985 – Microfungi on land plants: an identification handbook. Richmond Pub, (2nd edition 1997).

Murvanishvili IK, Dekanoidze NG 1992 – A new Asterosporium Kunzecoelomycete. Mikol Fitopatol 26, 27–29.

Sutton BC 1980 – The Coelomycetes. Fungi imperfecti with pycnidia, acervuli and stromata

Wijayawardene NN, Hyde KD, Wanasinghe DN, Papizadeh M et al. 2016 Taxonomy and phylogeny of dematiaceous coelomycetes. Fungal diversity 77, 1316.

 

Last Update: 08 April 2021

 

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