File:BrittonBrown1913 drfi2 001 Dryopteris filix-mas Male fern.png

See also rotated and cropped version

Summary

From: Britton, N. L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1:21.

Copyright has expired. Image source:

http://plants.usda.gov/java/largeImage?imageID=drfi2_001_avd.tif Dryopteris filix-mas (L.) Schott - Male fern

Curated and maintained by: USDA NRCS National Plant Data Center, Courtesy of Kentucky Native Plant Society.

This derivation: cleaned, crop minimal + border 20 px, smooth, (if 2 bit and > 2000px: resize 70%), contrast enhance.

Licensing

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