Fungi genera

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	Genus	ranks
	Radulodon Ryvarden	None
	Ramaria Fr. ex Bonord.	None
	Ramariopsis (Donk) Corner	None
	Rectipilus Agerer	None
	Resinomycena Redhead & Singer	None
	Resupinatus Gray	None
	Retiboletus Manfr. Binder & Bresinsky	north temperate regions
	Rheubarbariboletus Vizzini, Simonini & Gelardi	Europe
	Rhizomarasmius R.H.Petersen	None
	Rhodactina Pegler & T.W.K.Young	India, Thailand
	Rhodocollybia Singer	None
	Rhodotus Maire	None
	Roridomyces (Fr.) Rexer	characterized by having a slimy, glutinous stipe in moist conditions
	Rossbeevera T.Lebel & Orihara	Asia, Australia
	Royoporus A.B.De	None
	Royoungia Castellano, Trappe & Malajczuk	Australia
	Rubroboletus Kuan Zhao & Zhu L.Yang	Widespread
	Rugiboletus G. Wu & Zhu L. Yang	East Asia
	Russula Pers.	None