. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. is attached tothe frond. (From Greek dry as, a tree, especially an oak tree because mostof these tnrive best in the woods.) The pinnules or ultimate leaflets all deeply divided or pinnatifid,the margins usually spiny. Fronds more or less triangular,broadest at base. Common in shady, moist woods, especiallyat sea level. Edges of indusium with or without gland-likehairs. D. soinulosa dilatata (L.) Ktz. Wood Fern The ultimate pinnules not deeply divided or at least only thelower
. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. is attached tothe frond. (From Greek dry as, a tree, especially an oak tree because mostof these tnrive best in the woods.) The pinnules or ultimate leaflets all deeply divided or pinnatifid,the margins usually spiny. Fronds more or less triangular,broadest at base. Common in shady, moist woods, especiallyat sea level. Edges of indusium with or without gland-likehairs. D. soinulosa dilatata (L.) Ktz. Wood Fern The ultimate pinnules not deeply divided or at least only thelower indusium with minute gland-like hairs on upper side. Pinnules often doubly saw-toothed and spiny. Textureless delicate than the preceding. Common in WesternOregon. D. rigida (Hoffm.) Und. The indusium without gland-like hairs. Margin of pinnulesoften but slightly toothed and usually not as spiny. Sorinearer midvein than the margin. Common. D. filix-mas (L.) Scott. Male fern 14 A POPULAR DESCRIPTION OF ^^^^^^^^& S5Sh^*»-n ^aapglfc^ -JjS-^ yylff^r ii—iiirtff*illt**B^Lj ,,,•? 88 ^^^/SsS^^S s§P .J5. THE COMMON OREGON FERNS 15 POLYSTICHUM. Sword Fern. Evergreen ferns growing in clusters. Sori round generallyborne on the back of the veins. Indusium shield-shaped and fixedat the center only. (From Greek poly, many, and stikes, a row. Some species havesori in more than one row.) Fronds once pinnate. Leaf-stalk long. Under favorable conditions the frondreaches a height of four feet or more. The pinnae arecurved like a sword and have a single large tooth on theupper edge of each pinna near the midrib. The marginsof the pinnae are beset with bristle-pointed teeth. One ofour most common forms. P. munitum (Kaulf.) Presl. Leaf-stalk short. Much resembling the former but not astall. Pinnae more closely placed. More common in East-ern Oregon. P. lonchitis (L.) Roth. Holly Fern Fronds once pinnate but pinnae pinately lobed at base. Moun-tains. P. scopulinum (Eaton) Maxon FILIX. Bladder
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Keywords: ., bookcentury1900, bookdecade1910, bookidpopulardescr, bookyear1913
