. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. rground stems.) Fronds thick, leathery and broad, divisions extend almost to mid-rib. At the coast on decaying logs or living trees. Root-stock creeping. P. scouleri Hook. Leather-leaf Polypod Division of frond longer and more or less acute. Rootstockcreeping. Very common and varied. Often found on mapletrees. _JR^_£Lccidentalis, (Hook) Maxon. Licorice Fern Divisions of frond short and blunt. Sori large, nearly covering the under side of pinnae. Prefers the rocks of mountains. P. he
. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. rground stems.) Fronds thick, leathery and broad, divisions extend almost to mid-rib. At the coast on decaying logs or living trees. Root-stock creeping. P. scouleri Hook. Leather-leaf Polypod Division of frond longer and more or less acute. Rootstockcreeping. Very common and varied. Often found on mapletrees. _JR^_£Lccidentalis, (Hook) Maxon. Licorice Fern Divisions of frond short and blunt. Sori large, nearly covering the under side of pinnae. Prefers the rocks of mountains. P. hesperium Maxon. Mountain Polypod CEROPTERIS. Indusium wanting, sori elongated, following course of the vein-lets, often branched. (From Greek ceros, meaning wax, and pteris, a fern.)Fronds pinnate, lower pinnae bi-pannatifid. Under surface cov-ered with a yellowish dust passing to white. Sporangia bornein long lines breaking through the powder when ripe. Onrocky hillsides. C. triangularis (Kaulf.) Und. Golden-back Fern. Tri-angularis is in reference to the triangular-shaped leaf. 18 A POPULAR DESCRIPTION OF.
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Keywords: ., bookcentury1900, bookdecade1910, bookidpopulardescr, bookyear1913
