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Stemonitis axifera is a species of slime mold found around the world. It fruits in clusters on dead wood, and has distinctive tall reddish-brown sporangia, supported on slender stalks. The erect, stalked cylindrical sporangia are arranged into bundles or clusters that are 7–15 mm (0.3–0.6 in) tall. Each sporangium is supported by a thin, shining, black stalk that is 3–7 mm (0.1–0.3 in) long. The bright rusty brown color of mature sporangia lightens to a pale brown after the spores have been dispersed. Spores measure 5 by 7 μm and have a smooth to minutely punctate surface texture.
In a wood pillar, in a house in the outskirts of a small rural town.
The species was first described as Trichia axifera by Jean Baptiste François Pierre Bulliard in 1791. Thomas Huston MacBride transferred it to the genus Stemonitis in 1889. Stemonitis fasciculata and Stemonitis smithii are synonyms.