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  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Involucre  \In"vo*lu`cre\  (?;  277),  n.  [L.  involucrum  a  covering, 
  wrapper,  fr  involvere  to  wrap  up  envelop:  cf  F.  involucre. 
  See  {Involve}.]  (Bot.) 
  a  A  whorl  or  set  of  bracts  around  a  flower,  umbel,  or  head. 
  b  A  continuous  marginal  covering  of  sporangia,  in  certain 
  ferns,  as  in  the  common  brake,  or  the  cup-shaped 
  processes  of  the  filmy  ferns. 
  c  The  peridium  or  volva  of  certain  fungi.  Called  also 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Involucrum  \In`vo*lu"crum\,  n.;  pl  L.  {Involucra},  E. 
  {Involucrums}.  [L.  See  {Involucre}.] 
  1.  (Bot.)  See  {Involucre}. 
  2.  (Zo["o]l.)  A  sheath  which  surrounds  the  base  of  the  lasso 
  cells  in  the  Siphonophora.