Webster's Revised Unabridged Dictionary
NL., fr. L. ianthinus, violet-blue, Gr. ; violet + flower
Chambers's Twentieth Century Dictionary
Gr. ianthinos—ion, a violet, anthos, a flower.
Mr. Macgillivray states that it is furnished with a float in the manner of Ianthina.
"Voyage Of H.M.S. Rattlesnake, Vol. 2 (of 2)" by John MacGillivray
M. ianthina differs in having a conical cap.
"The Mushroom, Edible and Otherwise" by M. E. Hard