Dictyonema is a genus of mainly tropical basidiolichens in the family Hygrophoraceae. Unlike most lichens, which contain fungi related to yeasts and molds, Dictyonema species contain fungi more closely related to mushrooms. The genus includes about 40 recognized species found mainly in tropical regions, ranging from lowland forests to high mountain elevations up to 4,300 meters in the Andes. These lichens come in various forms, from crusty patches to leaf-like structures to thread-like mats, and most grow on soil, rocks, moss, or rotting logs. One species from the Amazon rainforest has traditional use by indigenous peoples as a hallucinogenic substance in shamanic rituals.

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