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Pleurostomophora richardsiae 

Synonymy: 
Phialophora richardsiae

Vijaykrishna et al. (2004) separated Pleurostomophora richardsiae from Phialophora based on molecular data. P. richardsiae is a soft rot fungus of wood and is an uncommon cause of human infection, usually through traumatic implantation causing subcutaneous phaeohyphomycosis.

RG-2 organism.

Morphological Description: 
Colonies grow rapidly, and are powdery to woolly or tufted, greyish-brown with a grey-brown to olivaceous-black reverse. Two conidial types are produced: (1) hyaline conidia which are allantoid or cylindrical, 3-6 x 1.5-2.5 μm in size, formed on inconspicuous, peg-like phialides on thin-walled hyphae; and (2) brown, thick-walled conidia which are spherical to subspherical, 2.5-3.5 x 2-3 μm, formed on dark brown, slender, tapering phialides with flaring collarettes.

Key Features: 
P. richardsiae is characterised microscopically by phialides with prominent flaring collarettes bearing globose, brown conidia while phialides with indistinct collarettes bear pale allantoid to cylindrical conidia.

Molecular Identification: 
ITS sequencing is recommended (Vijaykrishna et al. 2004).

References:
Ellis (1971), McGinnis (1978a, 1980), Domsch et al. (1980), de Hoog et al. (2000, 2015), Vijaykrishna et al. (2004), Revankar and Sutton (2010).

Antifungal Susceptibility: Pleurostomophora richardsiae limited data (Australian National data); MIC µg/mL.

No <0.03 0.06 0.125 0.25 0.5 1 2 4 8 16 >32
AmB 7 1 1 4 1
VORI 7 3 4
POSA 5 1 2 2
ITRA 7 2 3 2
P. richardsiae data from 11 isolates (McGinnis and Pasarell 1998a); MIC µg/mL.
AmB Range 0.125-1; Geometric mean = 0.73
VORI Range 0.25-2; Geometric mean = 0.64
ITRA Range 0.03-2; Geometric mean = 0.44

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