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Myrmecridium schulzeri

Synonymy: 
Ramichloridium schulzeri

Ramichloridium schulzeri was placed in a new genus, Myrmecridium by Arzanlou et al. (2007). M. schulzeri is an uncommon soil saprophyte of worldwide distribution. It has also been isolated from plant detritus and as a contaminant of bronchoscopy fluid. It is the causative agent of “Golden Tongue” syndrome reported by Rippon et al. (1985).

RG-1 organism.

Morphological Description: 
Colonies growing moderately rapidly, consisting of a rather compact, flat, submerged mycelium, pale orange, locally with some powdery, brownish aerial mycelium; reverse pink to orange. Conidiophores are erect, straight, unbranched, thick-walled, reddish-brown, up to 250 µm high, gradually becoming paler towards the apex, of variable length, elongating sympodially during conidiogenesis, with scattered, pimple-shaped conidium bearing denticles which have unpigmented scars. Conidia are subhyaline, smooth-walled or slightly rough-walled, ellipsoidal, obovoidal or fusiform, 6.5-10 x 3-4 µm, usually with an acuminate base and unpigmented scars.

Molecular Identification: 
ITS and D1/D2 sequencing may be used for accurate species identification (Halliday et al. 2015).

Note: Myrmecridium species can be distinguished from other Ramichloridium-like fungi by having entirely hyaline vegetative hyphae, and widely scattered, pimple-shaped denticles on the long hyaline rachis. The conidial sheath is also visible in lactic acid mounts with bright field microscopy Arzanlou et al. (2007).

References: 
de Hoog (1977), Rippon et al. (1985), de Hoog et al. (2000, 2015), Arzanlou et al. (2007).

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