Sori

from The Collaborative International Dictionary of English v.0.48
Sori \So"ri\, n.,
   pl. of {Sorus}.
   [1913 Webster]
from The Collaborative International Dictionary of English v.0.48
Sorus \So"rus\, n.; pl. {Sori}. [NL., fr. Gr. ? a heap.]
   1. (Bot.) One of the fruit dots, or small clusters of
      sporangia, on the back of the fronds of ferns.
      [1913 Webster]

   2.
      (a) In parasitic fungi, any mass of spores bursting
          through the epidermis of a host plant.
      (b) In lichens, a heap of soredia on the thallus.
          [Webster 1913 Suppl.]
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