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A recent collection of  Lepiota spiculata  from the Dominican Republic is presented here. Macro- and micromorphological features of  L. spiculata  are described in detail, and its evolutionary (phylogenetic) position within  Lepiota  sect.  Ovisporae , in the subincarnata/brunneoincarnata clade, is assessed on the basis of a combined nrLSU + nrITS +  rpb2  +  tef1  analysis. Additionally, high levels of deadly amatoxins were detected and quantified in  L. spiculata  for the first time by HPLC analysis; in particular, α-amanitin was found at concentrations up to approximately 4 mg/g dry weight, which render  L. spiculata  a potentially lethal mushroom, if ingested.

First Report of a Neotropical Agaric (Lepiota spiculata, Agaricales, Basidiomycota) Containing Lethal α-Amanitin at Toxicologically Relevant Levels