. 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. POLYPODIACEAE. Vol. I. Indusia flat, thin. Blades narrow, linear-oblong to lanceolate ; sori nearly medial. 5. D. cristata. Blades broader, narrowly oblong, ovate or triangular ovate; sori near midvein. Apex attenuate ; pinnae broadest at base ; sori 3-7 pairs. 6. D. Clintoniana. Apex short-acuminate, often abruptly so; pinnae broadest above the base; sori 6-10
. 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. POLYPODIACEAE. Vol. I. Indusia flat, thin. Blades narrow, linear-oblong to lanceolate ; sori nearly medial. 5. D. cristata. Blades broader, narrowly oblong, ovate or triangular ovate; sori near midvein. Apex attenuate ; pinnae broadest at base ; sori 3-7 pairs. 6. D. Clintoniana. Apex short-acuminate, often abruptly so; pinnae broadest above the base; sori 6-10 pairs. 7. D. Goldiana. Indusia convex, firm. Sori near the margin. 8. D. marginalia. Sori near the midvein. 9. D. Filix-mas. Blades 2-pinnate to 3-pinnate ; segments spinulose or mucronate. Blades ovate-lanceolate, triangular, or broadly oblong, usually not narrowed below. Indusia glabrous or nearly so ; pinnae usually somewhat oblique to the rachis, the lowest broadly and unequally ovate to triangular. Pinnules flat, decurrent; sori terminal on the veinlets ; scales pale brownish. 10. D. spinulosa. Pinnules concave, some not decurrent; sori mostly subterminal; scales dark brownish. 11. D. dilatata. Indusia glandular ; pinnae usually at right angles, the lowest unequally lanceolate to ovate-lanceolate. 12. D. intermedia. Blades elongate-lanceolate, usually narrowed below. D. Boottii. Indusia wanting (§ Phegopteris). Basal pinnae sessile or partially adnate: rachis more or less alate. Blades usually longer than broad; rachis and midveins freely chaffy; under surfaces pilose. 14. D. Phegopteris. Blades usually broader than long; rachis and midveins scarcely scaly; under surfaces slightly pubescent. 15. D. hexagonoptera. Basal pinnae long-stalked; rachis not alate. Blades nearly horizontal, glabrous or nearly so, subternate, the basal pinnae approaching the terminal portion in size. 16. D. Dryopteris. Blades suberect, copiously glandular, triangular-ovate, the basal pinnae
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
