. A popular description of the common Oregon ferns; contribution from the Herbarium of the University of Oregon. BB. Sori naked. C. Sori roundish; not usual-ly more than twice aslong as broad. d. Fronds bi-tr:pinnatificlor ternate. PhegopterisPage 17. dd. Fronds oncepinnatifid. Polypodium Page 17

---

Size: 1775px × 1408px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1910, bookidpopulardescr, bookyear1913