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Microascus trigonosporus
Emmons & Dodge (1931)
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Colonies on potato dextrose agar at 25°C are white to gray to brownish, varying considerably between strains. Colonies are somewhat restricted in growth, and may become reddish with the liberation of ascospores. Perithecia appear as small black dots in the concentric rings.
Hyphae are septate and hyaline initially, darkening with age. The Scopulariopsis trigonospora anamorph is dematiaceous, with conidiophores arising from the vegetative hyphae either singly or in groups. Annellophores are long and narrow, broad in the center, and tapering toward the ends. Annelloconidia are brownish, borne in chains, are truncate at the basal end, rounded or papillate at the apex, and measure approximately 2.5-3.5 x 3.5-5.5 µm. The sexual structures, perithecia, are black, globose at the base, 125-250 µm in diameter, with very long necks measuring up to 250 µm. Asci measure 6-9 x 9-12 µm and are oval to subglobose. Ascospores are pale to reddish-brown in mass, concave on all sides (triangular), and measure 3.5 x 3.5-5.5 2.5 µm [531], [2202].
There are several dematiaceous Scopulariopsis species, some of which go on to produce teleomorphs in the genus Microascus. Phaeoid Scopulariopsis cultures should be held for extended periods to ascertain whether these anamorphs will eventually produce their perithecial teleomorphs. Microascus cinereus is distinguished from M. cirrosus and M. trigonosporus primarily by the size of the perithecia, the length of the necks, and the shape of the ascospores. It has been reported as the etiologic agent of a human nail infection [18], an agent of maxillary sinusitis coexisting with Aspergillus repens [147], suppurative cutaneous granulomata in a patient with chronic granulomatous disease [1439], endocarditis of a prosthetic valve implanted after a staphylococcal endocarditis of a native valve [403], and a brain abscess in a bone marrow transplant recipient [152].
PubMed
GenBank
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Perithecium and ascospores
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References
18. Agarwal, G. P., and S. M. Singh. 1980. Microascus cinereus infection of human nail. Indian J Med Sci. 34:263-5.
147. Aznar, C., C. de Bievre, and C. Guiguen. 1989. Maxillary sinusitis from Microascus cinereus and Aspergillus repens. Mycopathologia. 105:93-7.
152. Baddley, J. W., S. A. Moser, D. A. Sutton, and P. G. Pappas. 2000. Microascus cinereus (anamorph Scopulariopsis) brain abscess in a bone marrow transplant recipient. J Clin Microbiol. 38:395-397.
403. Celard, M., E. Dannaoui, M. A. Piens, E. Gueho, G. Kirkorian, T. Greenland, F. Vandenesch, and S. Picot. 1999. Early Microascus cinereus endocarditis of a prosthetic valve implanted after Staphylococcus aureus endocarditis of the native valve. Clin Infect Dis. 29:691-2.
531. de Hoog, G. S., J. Guarro, J. Gene, and M. J. Figueras. 2000. Atlas of Clinical Fungi, 2nd ed, vol. 1. Centraalbureau voor Schimmelcultures, Utrecht, The Netherlands.
1439. Marques, A. R., K. J. Kwon-Chung, S. M. Holland, M. L. Turner, and J. I. Gallin. 1995. Suppurative cutaneous granulomata caused by Microascus cinereus in a patient with chronic granulomatous disease. Clin Infect Dis. 20:110-4.
2202. Sutton, D. A., A. W. Fothergill, and M. G. Rinaldi (ed.). 1998. Guide to Clinically Significant Fungi, 1st ed. Williams & Wilkins, Baltimore.
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