. The fern lover's companion; a guide for the Northeastern States and Canada. pening, or network), andtheir meshes are called areola; or areoles (Latin, areola, alittle ojjen space). EXPLAXATIOX OF TeRMS A frond is said to he pinnate(Latin, pinna, a feather), when itsprimary divisions extend to the rachis,as in tlie Christmas fern (Fig. 1). Afrond is hijjinnate (Latin, his, twice)when the lobes of the pinna; extend tothe midvein as in the royal fern (). These divisions of the pinn;e arecalled pinnules. When a frond istripinnate the last complete divisionsare called ultimate ])innules or s
. The fern lover's companion; a guide for the Northeastern States and Canada. pening, or network), andtheir meshes are called areola; or areoles (Latin, areola, alittle ojjen space). EXPLAXATIOX OF TeRMS A frond is said to he pinnate(Latin, pinna, a feather), when itsprimary divisions extend to the rachis,as in tlie Christmas fern (Fig. 1). Afrond is hijjinnate (Latin, his, twice)when the lobes of the pinna; extend tothe midvein as in the royal fern (). These divisions of the pinn;e arecalled pinnules. When a frond istripinnate the last complete divisionsare called ultimate ])innules or seg-ments. A frond is pinnatifid when itslobes extend halfway or more to therachis or midvein as in the middlelobes of the pinnatifid spleenwort(Fig. .3). The pinnie of a frond areoften pinnatifid when the frond itself is pinnate; and a frond may be pinnate in its lower ])artand become pinnatifid higher up as in the pinnatifidspleenwort just mentioned (Fig. A). The divisions of a pinnatifid leaf are called segments;of a bipinnatifid or tripinnatifid leaf, ultimate 24 The Fern Lovers Companion
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Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192400171, bookyear1922
