The fruit bodies of Mycena acicula grow singly, in groups, or somewhat clustered on debris in wet places, especially along streams or the borders of swamps.
 The appearance of the fruit bodies is not significantly influenced by the effect of rainfall, perhaps because "such minute fungi are largely determined by the microenvironment prevailing under dense vegetation, etc.,
which is no doubt less affected by recent rain than more exposed situations."
The fungus is widely distributed throughout the eastern United States and Canada and occurs in Washington, Oregon, and California along the Pacific Coast.
It has also been reported from Trinidad, Britain, Norway, Spain, Korea, and the Ussuri River Valley in the northeast of China.
The fruit bodies of Mycena acicula grow singly, in groups, or somewhat clustered on debris in wet places, especially along streams or the borders of swamps.  The appearance of the fruit bodies is not significantly influenced by the effect of rainfall, perhaps because "such minute fungi are largely determined by the microenvironment prevailing under dense vegetation, etc., which is no doubt less affected by recent rain than more exposed situations." The fungus is widely distributed throughout the eastern United States and Canada and occurs in Washington, Oregon, and California along the Pacific Coast. It has also been reported from Trinidad, Britain, Norway, Spain, Korea, and the Ussuri River Valley in the northeast of China.
Mycena acicula