. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. AA. Fronds all alike, sporangia borneon back or margin of frond. B. Sori covered with indusia. C. Sori marginal, covered withreflexed portion of marginof frond,d. Indusium continuous. e. Fronds usually clustered,f. Fronds smooth. Pellaea Page 11 ff. Fronds wooly. CheilanthesPage 13 ee. Fronds usually solitary. d. Indusium discontinuous. PterisPage 13 AdiantumPage 13 CC. Sporangia provided with Indusia roundish. e. Indusia heart-shaped. DryopterisPage 13.

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Keywords: ., bookcentury1900, bookdecade1910, bookidpopulardescr, bookyear1913