. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus i. ROYAL FERN FAMILY. Family 2. OSMUNDACEAE R. Br. Prodr. Fl. Nov. Holl. i: 161. 1810. Royal Fern Family. Large ferns with creeping or suberect rootstocks. Stipes winged at the base, the blades 1-2-pinnate or tripinnatifid, with free mostly forked veins extending to the margins. Sporanges naked, large, globose, mostly stalked, borne on modi- fied contract
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. Genus i. ROYAL FERN FAMILY. Family 2. OSMUNDACEAE R. Br. Prodr. Fl. Nov. Holl. i: 161. 1810. Royal Fern Family. Large ferns with creeping or suberect rootstocks. Stipes winged at the base, the blades 1-2-pinnate or tripinnatifid, with free mostly forked veins extending to the margins. Sporanges naked, large, globose, mostly stalked, borne on modi- fied contracted pinnae and nearly covering them or (in Todea and Leptopteris, Old World genera) in clusters (sori) on the lower surface of the pinnules or segments, opening in 2 valves by a longitudinal slit; ring wanting or mere traces of one near the apex. Three living genera, Osmunda and the two mentioned. 1. OSMUNDA [Tourn.] L. Sp. PI. 1063. 1753. Tall swamp or lowland ferns, the leaves in large crowns, long-stalked, the blades bipin- natifid or bipinnate, with regularly forked prominent veins, the fertile portions much con- tracted and devoid of chlorophyl, the short-stalked sporanges thin, reticulated, opening in halves, a few parallel thickened cells near the apex representing the rudimentary transverse ring. Spores copious, greenish. [From Osmunder, a Saxon name for the god Thor.] Eight species, the following in North America. .Type species : Osmunda regalis L. Blades bipinnate, some of them fertile at the apex. 1. O. regalis. Herbaceous blades bipinnatifid. Pinnae of sterile blade with a tuft of tomentum at the base; blades normally dimorphous. 2. O. cinnamomea. Pinnae of sterile blade lacking a tuft of tomentum at the base ; blades normally fertile only in the middle. 3. O. Claytoniana. 1. Osmunda regalis L. Royal Fern. Fig. 15. Osmunda regalis L. Sp. PI. 1065. 1753. Rootstock stout, bearing a cluster of several long-stalked leaves, 2°-6° high, the apical pinnae fertile, contrac
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
