Aspidotis californica - Photograph of California lacefern. elib.cs.berkeley.edu/imgs/512x768/5208_1611/1618/0001.jpeg
Aspidotis californica (Hook.) Copel. - Data on distribution in California with image. www.calflora.org/cgi/calflora_query?where-calrecnum=759&one=T&special=photo
Aspidotis densa - Distribution map from Atlas of the Vascular Flora of Wyoming in pdf format. www.esb.utexas.edu/tchumley/wyomap/plp/aspden.pdf
Aspidotis densa (Brackenr.) Lellinger - Data on this species in California with link to photographic images. www.calflora.org/cgi/calflora_query?where-calrecnum=761&one=T&special=photo
