Veronaea botryosa

This genus is very similar to Rhinocladiella, however the conidia are typically two-celled. Occasional skin infections have been reported from humans (Revankar and Sutton 2010).

RG-2 organism

Veronaea

Conidiophores and conidia of Veronaea botryosa.

Morphological description: 
Colonies grow rapidly and are suede-like to downy, greyish-brown to blackish-brown. Conidiophores are erect, straight or flexuose, occasionally branched and are usually geniculate, due to the sympodial development of the conidia. They are smooth-walled, pale to medium olivaceous-brown, up to 250 µm long and 2-4 µm wide. Conidia are pale brown, two-celled, cylindrical with a truncated base, smooth-walled or slightly verrucose, 5-12 x 3-4 µm.

Molecular identification: 
Arzanlou et al. (2007) used D1/D2 and ITS sequence data in a phylogenetic revision.

Antifungal susceptibility: Veronaea botryosa  limited data (Australian national data); MIC µg/mL.  
  No ≤0.016 0.03 0.06 0.125 0.25 0.5 1 2 4 ≥8
AmB 2                   2
VORI 2                 2  
POSA 2         1 1        
ITRA 2           1   1    

 References:

  • Arzanlou, M., Groenewald, J.Z., Gams. W., et al. (2007) Phylogenetic and morphotaxonomic revision of Ramichloridium and allied Genera. Studies in Mycology, 58, 57-93.
  • Badali, H., Yazdanparast, S.A., Bonifaz, A., et al. (2013) Veronaea botryosa: molecular identification with amplified fragment length polymorphism (AFLP) and in vitro antifungal susceptibility. Mycopathologia, 175, 505-513.
  • de Hoog, G.S., Guarro, J., J. Gene, J., et al. (2020) Atlas of clinical fungi. 4th edition. Foundation Atlas of Clinical Fungi https://webshop.atlasclinicalfungi.org.
  • Ellis, M.B. (1971) Dematiaceous hyphomycetes. Commonwealth Mycological Institute, Kew, Surrey, England.
  • Kidd, S., Halliday, C., Ellis, D. (2023) Descriptions of Medical Fungi (4th edition). CABI.
  • Revankar, S.G. and Sutton, D.A. (2010) Melanized fungi in human disease. Clinical Microbiology Reviews, 23, 884-928.

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