. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. THE COMMON OREGON FERNS 17 ATHYRIUM. Fronds bi-pinnate, usually tapering in both directions and widestat middle. Sori oblong and oblique to midvein. In moist ground, becomes dwarfed at high altitudes. A. cyclosorum Rupr. Western Lady-fern PHEGOPTERIS. Beech Fern. Sori always without indusia, round. Frond twice or thrice pin-nate or pinnatifid, or tenate. (From the Greek phagus, an oak or beech, and pteris, a fern.) Fronds twice pinnate, pinnules pinnatifid. Cliffs at high eleva-tion
. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. THE COMMON OREGON FERNS 17 ATHYRIUM. Fronds bi-pinnate, usually tapering in both directions and widestat middle. Sori oblong and oblique to midvein. In moist ground, becomes dwarfed at high altitudes. A. cyclosorum Rupr. Western Lady-fern PHEGOPTERIS. Beech Fern. Sori always without indusia, round. Frond twice or thrice pin-nate or pinnatifid, or tenate. (From the Greek phagus, an oak or beech, and pteris, a fern.) Fronds twice pinnate, pinnules pinnatifid. Cliffs at high eleva-tions. P. alpestris (Hoppe) Mott. Alpine Beech Fern Fronds thrice divided, each division pinnate and the pinnae pin-natifid. Pinnae on the lower side the larger. Common indamp woods. P. dryopteris (L.) Fee. Oak Fern POLYPODIUM. The Polypod. Sori always naked, roundish. Fronds of our species once pinnateor pinnatifid. (From Greek poly, many, podos, foot, referring to its numerousunderground stems.) Fronds thick, leathery and broad, divisions extend almost to mid-rib. At the coast on decaying logs or living trees
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Keywords: ., bookcentury1900, bookdecade1910, bookidpopulardescr, bookyear1913
