Monitoring-indicator
Guides
Phyciodes orseis
California Crescent, Orseis crescentspot
Phyciodes orseis is a small nymphalid butterfly endemic to western North America, with its core range in northern California and Oregon. It inhabits mountain valleys, meadows, and stream canyons, where it has been documented as part of ecosystem monitoring efforts on the Fremont-Winema National Forests. The species has experienced range contraction, with historical records from the San Francisco Bay Area now considered mislabeled or representing extirpated populations.