The order Rhytismatales is a group of fungi within the class Leotiomycetes, primarily known for their association with plants, often as pathogens or endophytes. Members of this order typically form ascocarps—fruiting bodies—on leaves, needles, or bark, frequently creating characteristic darkened or discolored spots. Many species in Rhytismatales are responsible for leaf spot diseases in conifers and other plants, sometimes leading to premature leaf drop or reduced plant vigor. Ecologically, they play roles in decomposition and nutrient cycling by breaking down plant tissues, while some maintain long-term, asymptomatic relationships with their hosts. Morphologically, they are distinguished by their elongated or linear ascomata and bitunicate asci, features that aid in their identification and classification.