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Webster 1913 Edition

Adj.

[

Miter

-form

: cf. F.

mitriforme

Having the form of a miter, or a peaked cap;

as, a

mitriform

calyptra

Gray.

mitriform ‎(comparative more mitriform, superlative most mitriform)

Having the form of a miter, or peaked cap.
- 1844, Sir James Edward Smith, The English Flora (volume 1, page 29)
  The crisped leaves, with the different nature of the peristome and mitriform calyptra, multifid at the base, are, however, certain marks of distinction.