. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. f evident pinnules whosein-rolled margins form the indusium. Sterile frond twice or threetimes pinnate. (From Greek cryptos, hidden, gramma, a line, referring to thearrangement of the sporangia in lines which are hidden by theindusium.) Found growing in clefts of rocks. C. acrostichoides PELLAEA. Cliff Brake. Sori at the tips of veins, when mature forming a marginal line;covered by an indusium formed of the reflexed margin of thefrond. Clustered, grov/ing on rocks and cliffs. (From
. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. f evident pinnules whosein-rolled margins form the indusium. Sterile frond twice or threetimes pinnate. (From Greek cryptos, hidden, gramma, a line, referring to thearrangement of the sporangia in lines which are hidden by theindusium.) Found growing in clefts of rocks. C. acrostichoides PELLAEA. Cliff Brake. Sori at the tips of veins, when mature forming a marginal line;covered by an indusium formed of the reflexed margin of thefrond. Clustered, grov/ing on rocks and cliffs. (From Greek pellos, meaning dusky or dark and referring tothe dark color of the stipe.) Fronds once pinnate, pinnae short-stalked 6-12 pairs. Highmountains. P. breweri D. C. Eaton Fronds tivice pinnate. Stipes purplish-brown. Pinnae severalpairs, pinnules numerous. As yet only reported from South-ern Oregon. P. brachyptera (Moore) Baker Fronds thrice pinnate. Stipes densely placed, wiry, dark chest-nut-brown. Sometimes a few sterile fronds are present. P. densa Hook. Oregon Cliff Brake 12 A POPULAR DESCRIPTION OF.
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