There are approximately 20 species in this genus.: Y. acaciae · Y. besseyi · Y. castillae · Y. farinosa · Y. halophila · Y. haplophilum · Y. inositovora · Y. media · Y. medium · Y. mexicana · Y. mexicanum · Y. nakazawae · Y. ohmeri · Y. philogaea · Y. scolyti · Y. segobiense · Y. segobiensis · Y. spartinae · Y. stipite · Y. stipitis
There are approximately 1 species in this genus.: Y. pulcher
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