Harzia acremonioides (Harz) Cost.

5-day old
10-day old

COLONIES powdery, pale orange (5B3) to salmon (6C4), ca. 5 cm diam when 5-day old, salmon (6C4) to rust brown (6E8) and covering the whole area of potato dextrose agar (PDA) of a diameter of 10 cm when 10-day old and grown at a room temperature.



CONIDIOPHORES (cp) cymosely branched, hyaline, sharpened at the tip, straight or slightly curved, 1-septate, producing blastoconidia.

CONIDIA (c; blastoconidia) obovoid, almost smooth, hyaline when young, greyish orange (5B4-5) to brownish yellow (5C8) when mature, 20-30 x 15-20 µm.

SUBSTRATE AND DISTRIBUTION. Harzia acremonioides is a commonly occurring saprotroph on different substrates (Domsch et al. 1980). The fungus has frequently been identified among microorganisms associated with seeds of different plant species (e. g., Blaszkowski 1994 a, b; Blaszkowski and Piech 2002; Domsch et al. 1980; Neergaard P. 1977; Piech and Blaszkowski 1993).

Harzia acremonioides has been encountered in all climatic regions of the world (Domsch et al. 1980).

NOTES. The original name of H. acremonioides was Acremoniella atra (Corda) Sacc. (Domsch et al. 1980; Holliday 1989).

The genus Harzia comprises three species, of which H. acremonioides is the most widely distributed fungus (Domsch et al. 1988).

In fungal populations associated with seeds, H. acremonioides frequently co-occurs with Alternaria alternata (Fr.) Keissler (Blaszkowski 1994 a, b; Blaszkowski and Piech 2002; Domsch et al. 1980).


Blaszkowski J. 1994. The occurrence of Septoria nodorum Berk. and associated mycoflora in seeds of wheat cultivated in the Szczecin voivodeship. Acta Mycol. 29, 43-52.

Blaszkowski J. 1994. The influence of fungicides on the mycoflora of leaves of Triticum aestivum L. Acta Mycol. 29, 147-157.

Blaszkowski J., Piech M. 2002. Comparison of seed-borne fungal communities of naked and husked oats and barley. Phytopath. Pol. 24, 71-74.

Domsch K. H., Gams W., Anderson T. 1980. Compendium of soil fungi. Acad. Press. London-New York-Toronto-Sydney-San Francisco.

Holliday P. 1989. A dictionary of plant pathology. Cambridge University Press. Cambridge, New York, New Rochelle, Melbourne, Sydney.

Neergaard P. 1977. Seed pathology. The Macmillan Press Ltd. London.

Piech M., Blaszkowski J. 1993. The influence of the degree of reproduction on the mycoflora of winter XTriticosecale seeds. Bull. Pol. Ac. Sci. Biol. Sci. 41, 393-399.