- PacNW Herbaria Records for Ptilidium californicum
- Search Arctos Database for Ptilidium californicum (Southeast only)
- Search Arctos Database for Ptilidium californicum (entire database)
- Encyclopedia of Life search for Ptilidium californicum
- iNaturalist Observations for Ptilidium californicum in Southeast Alaska
Southeastern Alaska Distribution: See Map 93. Throughout, from sea level to the subalpine.
Habitat: On bark and drier deadfall in forest regions and in the subalpine. Occasionally among other bryophytes on dry forest floors. Also recorded from stranded driftwood.
Comments: Perianths are occasionally present in the southeastern Alaskan material.
Worley's map of Ptilidium californicum collections