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Sarcoscypha occidentalis, commonly known as the stalked scarlet cup or the western scarlet cup, is a species of fungus in the family Sarcoscyphaceae, order Pezizales. Fruit bodies have small, bright red cups up to 2 cm (0.8 in) wide atop a slender whitish stem that is between 1 to 3 cm (0.4 to 1.2 in) long. A saprobic species, it is found growing on hardwood twigs, particularly those that are partially buried in moist and shaded humus-rich soil. The fungus is distributed in the continental United States east of the Rocky Mountains, Central America, the Caribbean, and Asia. It is distinguished from the related species S. coccinea and S. austriaca by differences in geographical distribution, fruiting season, and fruit body structure. Phylogenetic analysis has shown that it is most closely related to other Sarcoscypha species that contains large oil droplets in their spores. The species Molliardiomyces occidentalis is an imperfect form of the fungus that lacks a sexually reproductive stage in its life cycle.