DESCRIPTIONS OF MEDICAL FUNGI

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228 Descriptions of Medical Fungi Members of this genus are often isolated from the environment. It has been reported as a rare agent of mycotic keratitis. RG-1 organism. Verticillium Nees ex Link Morphological Description: Colonies are fast growing, suede-like to downy, white to pale yellow in colour, becoming pinkish-brown, red, green or yellow with a colourless, yellow or reddish-brown reverse. Conidiophores are usually well differentiated and erect, verticillately branched over most of their length, bearing whorls of slender awlshaped divergent phialides. Conidia are hyaline or brightly-coloured, mostly one-celled, and are usually borne in slimy heads (glioconidia). Molecular Identification: ITS, actin, EF-1α, GPDH and tryptophan synthase genes have been used to identify all recognised Verticillium species (Inderbitzin et al. 2013). Key Features: Hyphomycete, verticillate branched conidiophores bearing whorls of awl-shaped, divergent phialides. References: Domsch et al. (1980), McGinnis (1980), Rippon (1988), Samson et al. (1995), de Hoog et al. (2000, 2015). 20 µm Verticillium spp conidiophores, phialides and conidia.
Descriptions of Medical Fungi 229 Wickerhamomyces anomalus (E.C. Hansen) Kurtzman et al. Synonymy: Candida pelliculosa Redaelli. Wickerhamomyces anomalus has been reported from cases of candidaemia and catheter related infections in humans and has been isolated from soil, grains, fruit and warm-blooded animals. RG-1 organism. Culture: Colonies (SDA) white to cream-coloured smooth, glabrous, yeast-like. Microscopy: Spherical to ellipsoidal budding blastoconidia, 2-4 x 2-6 µm. Pseudohyphae may be present. Asci when present, containing one to four hat-shaped ascospores. India Ink Preparation: Negative - no capsules present. Dalmau Plate Culture: Spherical to ellipsoidal budding yeast cells and abundant pseudohyphae in most strains. Molecular Identification: ITS sequencing recommended. MALDI-T<strong>OF</strong> MS: Able to accurately identify this species. Physiological Tests: + Positive, - Negative, v Variable, w Weak, s Slow, nd No Data Germ Tube - L-Sorbose - L-Arabinose v D-Glucitol + Fermentation Sucrose + D-Arabinose - α-M-D-glucoside + Glucose + Maltose + D-Ribose v D-Gluconate v Galactose v Cellobiose + L-Rhamnose - DL-Lactate + Sucrose + Trehalose + D-Glucosamine - myo-Inositol - Maltose v Lactose - N-A-D-glucosamine - 2-K-D-gluconate - Lactose - Melibiose - Glycerol + D-Glucuronate nd Trehalose - Raffinose + Erythritol + Nitrate + Assimilation Melezitose + Ribitol v Urease - Glucose + Soluble Starch + Galactitol - 0.1% Cycloheximide - Galactose v D-Xylose v D-Mannitol + Growth at 37 O C v Key Features: Germ tube negative yeast and sugar assimilation pattern Antifungal Susceptibility: W. anomalus (Diekema et al. 2009, Australian National data); MIC µg/mL. No. 64 AmB 42 1 5 14 21 2 FLU 43 2 8 25 8 VORI 42 1 2 1 22 13 3 POSA 42 1 1 7 4 15 12 2 ITRA 3 3 ANID 16 2 10 3 1 MICA 16 5 9 2 CAS 39 1 16 17 4 1 5FC 3 1 2
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DESCRIPTIONS OF MEDICAL FUNGI

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