Osmundaceae Key & Chart

Osmundaceae Key & Chart

Osmundaceae (Royal Fern Family) Key Key to species in Newfoundland and Labrador © Flora of Newfoundland and Labrador (2019) 1a. Fronds dimorphic, with completely separate sterile and fertile fronds; fertile fronds long and narrow, erect, densely covered with a woolly layer of cinnamon brown hairs, withering to the ground after spores are shed; sterile fronds pinnate-pinnatifid. ............... ................................................................... Osmundastrum cinnamomeum (cinnamon fern) 1b. Fertile fronds with dimorphic pinnae, sterile and fertile pinnae occurring on the same frond; fertile fronds or pinnae not densely covered with woolly hairs; sterile fronds pinnate-pinnatifid or bipinnate. ........................................................................................... 2 2a. Fronds pinnate-pinnatifid, with 2–5 pairs of fertile pinnae in the middle of the frond, these soon withering and dropping after spores are shed, leaving a gap in the frond; sterile pinnae narrowly lanceolate, pinnatifid. ............................................................. .............................................................. Claytosmunda claytoniana (interrupted fern) 2b. Fronds bipinnate, the terminal portion of the frond with several pairs of fertile pinnae, these soon withering after the spores are shed; the lower portion sterile, with lanceolate, entire short-stalked pinnules. ............................................................ ............................................................... Osmunda regalis var. spectabilis (royal fern) Osmundaceae Comparison Chart Species: Osmundastrum Claytosmunda Osmunda regalis cinnamomaeum claytoniana var. spectabilis cinnamon fern interrupted fern royal fern Sterile Fronds pinnate-pinnatifid, ellip- pinnate-pinnatifid, bipinnate, ovate; tic-oblong; to 1.2 m long elliptic; to 1.2 m long to 1.8 m long pinnae linear-lanceolate, pinnae linear-lanceolate, pinnules linear- Shape of Pinnae pinnatifid, ultimate pinnatifid, 13–18 cm lanceolate, to 7 cm or Pinnules on segments oblong, obtuse long, ultimate segments long, very short-staked, Sterile Fronds to acute; each pinnae oblong, blunt; woolly apex acute to rounded, with a tuft of white to tufts of hairs lacking at base oblique to cinnamon brown hairs at pinnae bases truncate, margins nearly the base, adjacent to the entire at the base to rachis denticulate towards the apex fertile fronds slightly 2–5 pairs of fertile several pairs of fertile Fertile Fronds shorter than sterile pinnae in the middle of pinnae occur at the or Fertile fronds, with a woolly the frond; fertile pinnae terminal part of the Pinnae coat of rusty-brown withering and falling from frond hairs; fertile fronds the rachis after spores withering to the ground are shed, leaving a gap in after spores are shed the middle of the frond .

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