. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. THE COMMON OREGON FERNS 13 PTERIS. Brake. Bracken. Fronds thrice pinnate. Sori on the edge of pinnules formingan unbroken line. Indusium continuous and formed by the in-curled margin of frond. Usually solitary; at least not in denseclusters. (From Greek pteros, a wing, which became to mean a fern fromthe wing-like structure of frond of fern. P. aquilina L. The Eagle Brake This with its varieties is widely distributed throughout NorthAmerica and the Old World, in Oregon often becomin
. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. THE COMMON OREGON FERNS 13 PTERIS. Brake. Bracken. Fronds thrice pinnate. Sori on the edge of pinnules formingan unbroken line. Indusium continuous and formed by the in-curled margin of frond. Usually solitary; at least not in denseclusters. (From Greek pteros, a wing, which became to mean a fern fromthe wing-like structure of frond of fern. P. aquilina L. The Eagle Brake This with its varieties is widely distributed throughout NorthAmerica and the Old World, in Oregon often becoming a trou-blesome weed in the fields. ADIANTUM. Maidenhair. Frond forking by twos. Sori on margin covered by a discon-tinuous indusium formed by the inrolled edge of frond. (From the Greek meaning not to moisten. Referring to thedifficulty of wetting the fronds. This can be prettily shown bydipping a frond beneath clear water and noting the silvery appear-ance due to air on the frond shut in by the water.) A. pedatum Rich moist forests everywhere in the state. CHEILANTHES. Lip Fern. Lace Fern. Sori near the
Size: 1830px × 1365px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidpopulardescr, bookyear1913
