Phallus tenuissimus is a species of fungus in the stinkhorn family. Found in Jingdong Yi Autonomous County in Yunnan, China, it was described as new to science in 2005. Its fruit bodies feature a conical to bell-shaped cap up to high by wide, covered by dark greenish-brown gleba (spore mass). The cap is supported by a slender, cylindrical stipe measuring long and 2–4 mm thick. Its spores are cylindrical, and measure 3.3–4 by 1.1–1.4 μm. The authors place it in the section Reticulati of genus Phallus on account of its reticulate cap.
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