• WordNet 3.6
    • n Claviceps fungi parasitic upon the ovaries of various grasses
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Century Dictionary and Cyclopedia
    • n claviceps A genus of pyrenomycetous fungi parasitic upon the seeds of various grasses and sedges. C. purpurea produces the ergot of rye. See ergot.
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In literature:

Head globose, base sclerotioid Claviceps.
"The Mushroom, Edible and Otherwise" by M. E. Hard
In its perfect state this germinates and produces the Claviceps fructification.
"The New Gresham Encyclopedia" by Various