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SUMMARY
A new species of ergot found on guinea grass (Panicum maximum var. common guinea) in Puerto Rico has been described and named Claviceps maximensis.
Chemical tests indicate that none of the usual ergot alkaloids are present in the sclerotia.
The stage of development of this disease is determined by some environmental condition. In arid regions where plant growth is confined to few months of the year, sclerotia are formed. In more humid regions with a long growing period the infection is restricted to the sphacelial stage only.