. 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. i. Pteridium aquilinum (L.) Kuhn. Brake. Bracken. Fig. 73. Pteris aquilina L. Sp. PI. 1075. 1753. Pteridium aquilinum Kuhn, in Decken's Reisen III. Bot. 11. 1879. Stipe i°-3° long, straw-colored or brownish, rigid, without chaff, swollen at the base. Blade 2°-4° long, i°-3° broad, triangular to deltoid-ovate, usually subternat
. 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. i. Pteridium aquilinum (L.) Kuhn. Brake. Bracken. Fig. 73. Pteris aquilina L. Sp. PI. 1075. 1753. Pteridium aquilinum Kuhn, in Decken's Reisen III. Bot. 11. 1879. Stipe i°-3° long, straw-colored or brownish, rigid, without chaff, swollen at the base. Blade 2°-4° long, i°-3° broad, triangular to deltoid-ovate, usually subternate, the long-stalked basal pinnae and the middle ones 2-pinnate, those above 2-pinnate to lobed or simple; segments oblong to lanceolate, the under surface glabrous or pubescent. In thickets or open situations throughout most of North America. Ascends to 5000 ft. in North Carolina. Aug. Nearly cosmopolitan. July-Sept. Earnfern, Eagle-fern, Lady-bracken, Adder-spit, Hog-brake. The var. pseudocaudatum Clute, from Massachusetts southward, has long linear pinnules, nearly simple. 16. CRYPTOGRAMMA R. Br. App. Franklin's Journ. 767. 1823. Small mainly alpine or boreal ferns with dimorphous leaves, the stipes greenish or straw- colored, the blades 2-3-pinnate, the fertile exceeding the sterile. Sori borne at or near the ends of the free forking veins, at length confluent. Indusia formed of the altered reflexed margin of the segment. [Greek, alluding to the sori hidden before maturity.] Four species, the following and 2 of Europe and Asia. Type species: C. acrostichoides R. Br. Rootstocks stout, clustered, ascending; fertile segments linear. 1. C. acrostichoides. Rootstocks slender, creeping; fertile segments much broader. 2. C. Stelleri. i. Cryptogramma acrostichoides R. Br. American Rock-brake. Fig. 74. Cryptogramma acrostichoides R. Br. App. Frank- lin's Journ. 767. 1823. Rootstock stout, short, chaffy; leaves clus- tered, the fertile ones surpassing the sterile. Stipes 2'-6' l
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
