DESCRIPTIONS OF MEDICAL FUNGI

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222 Descriptions of Medical Fungi Trichosporon inkin (Oho ex Ota) do Carmo-Sousa & van Uden Assimilation Tests: + Positive, - Negative, v Variable, w Weak, s Slow Glucose + Melibiose - L-Rhamnose - D-Glucitol - Galactose v Raffinose - D-Glucosamine v α-M-D-glucoside + L-Sorbose v Melezitose + N-A-D-glucosamine + D-Gluconate + Sucrose + Soluble Starch + Glycerol v DL-Lactate + Maltose + D-Xylose + Erythritol + myo-Inositol + Cellobiose + L-Arabinose v Ribitol - Nitrate - Trehalose + D-Arabinose v Galactitol - 2-K-D-gluconate + Lactose + D-Ribose + D-Mannitol v D-Glucuronate + Trichosporon mucoides Gueho & M.Th. Smith Morphological Description: Colonies are moist and glabrous, white, cerebriform, heaped and folded. Budding cells present in primary cultures. Broadly clavate, terminal or lateral blastoconidia often present, becoming thick-walled with age. Arthroconidia are barrel-shaped. Appressoria absent. This species assimilates melibiose and is tolerant to 0.01% (variable tolerance to 0.1%) cycloheximide. Growth at 37 O C. Common species associated with superficial infections, white piedra and onychomycosis. RG-2 organism. Assimilation Tests: + Positive, - Negative, v Variable, w Weak, s Slow Glucose + Melibiose + L-Rhamnose + D-Glucitol + Galactose + Raffinose + D-Glucosamine + α-M-D-glucoside + L-Sorbose + Melezitose + N-A-D-glucosamine + D-Gluconate + Sucrose + Soluble Starch + Glycerol + DL-Lactate + Maltose + D-Xylose + Erythritol + myo-Inositol + Cellobiose + L-Arabinose + Ribitol + Nitrate - Trehalose + D-Arabinose + Galactitol + 2-K-D-gluconate + Lactose + D-Ribose + D-Mannitol + D-Glucuronate + Trichosporon ovoides Behrend Morphological Description: Colonies are restricted, white, granular, folded at the centre, with a flat marginal zone. Budding cells and lateral conidia absent. Arthroconidia are cylindrical. Appressoria present in slide cultures. This species does not assimilate melibiose, but tolerates 0.01% cycloheximide. Growth at 37 O C is variable. Uncommon species usually associated with superficial infections, like white piedra. RG-2 organism. Assimilation Tests: + Positive, - Negative, v Variable, w Weak, s Slow Glucose + Melibiose - L-Rhamnose + D-Glucitol v Galactose + Raffinose v D-Glucosamine v α-M-D-glucoside + L-Sorbose v Melezitose v N-A-D-glucosamine + D-Gluconate + Sucrose + Soluble Starch + Glycerol v DL-Lactate + Maltose + D-Xylose + Erythritol + myo-Inositol + Cellobiose + L-Arabinose v Ribitol - Nitrate - Trehalose v D-Arabinose v Galactitol - 2-K-D-gluconate + Lactose + D-Ribose + D-Mannitol + D-Glucuronate +
Descriptions of Medical Fungi 223 Trichothecium roseum has a worldwide distribution and is often isolated from decaying plant substrates, soil, seeds of corn, and food-stuffs (especially flour products). It is occasionally isolated as a saprophyte in the clinical laboratory. RG-1 organism. Trichothecium roseum (Persoon) Link Morphological Description: Colonies are moderately fast growing, flat, suede-like to powdery, initially white but becoming rosy, pink or orange with age. The conidiophores are indistinguishable from the vegetative hyphae until the first conidium is produced. They are erect, unbranched, often septate near the base, more or less roughwalled, bearing basipetal zig-zag (alternating) chains of conidia at the apex. Note: The conidiophore is progressively shortened with the formation of each conidium i.e. retrogressive conidial development. Conidia are two-celled ellipsoidal to pyriform, with an obliquely truncate basal scar, hyaline, smooth to delicately roughened and thickwalled. Comment: T. roseum should not be confused with Nannizzia nanum. Colonies of the latter may be pinkish-buff in colour and also produce ovoid to pear-shaped, mostly twocelled macroconidia with thin, verrucose walls. However, N. nanum usually produces a red-brown reverse pigment and the two-celled macroconidia are sessile and formed singly, they are not produced in basipetal chains as in T. roseum. Molecular Identification: Summerbell et al. (2011) revised the genus using D1/D2 sequences for phylogenetic analysis and sequence based identification. Key Features: Hyphomycete, basipetal zig-zag chains of two-celled conidia showing retrogressive development where the conidiophore becomes progressively shorter. References: McGinnis (1980), Domsch et al. (2007), Rippon (1988), Samson et al. (1995), Summerbell et al. (2011). 20 µm Trichothecium roseum conidiophores showing retrogressive conidial development.
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DESCRIPTIONS OF MEDICAL FUNGI

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