The Collaborative International Dictionary of English v.0.48:

Melanconiales \Mel`an*co`ni*a"les\, n. pl. [NL., fr.
   Melanconium, name of the typical genus, fr. Gr. me`las black
   + ? dust, in allusion to the dark spores.] (Bot.)
   The smallest of the three orders of Fungi Imperfecti,
   including those with no asci nor pycnidia, but as a rule
   having the spores in cavities without special walls. They
   cause many of the plant diseases known as anthracnose.
   [Webster 1913 Suppl.]