stemonitaceæ

from The Century Dictionary.

• A family of myxomycetous fungi, belonging, according to the classification of Rostafinski, to the order Amaurochæteæ, which has a single sporangium or æthalium, without the peculiar deposits of lime carbonate that characterize the fructification of other orders, and the spores, capillitium, and columella usually uniformly black, or rarely brownish-violet.