. British ferns and their varieties. vulgare, the Common Polypody, , the Oak Fern, P. phegopteris, the Beech Fern, andP- calcareum {Robertianum), the Limestone Polypody. The namePolypodium signifies many-footed, the rootstocks travelling onor near the surface of the soil, and, as in the well-known HaresfootFern (Davallia), the growing tips resemble more or less hairy point of fact, however, many species, the Davallias themselvesto wit, do the same thing, but belong to quite different genera, theactual generic distinction of the Polypodium family being a fruc-tification, con
. British ferns and their varieties. vulgare, the Common Polypody, , the Oak Fern, P. phegopteris, the Beech Fern, andP- calcareum {Robertianum), the Limestone Polypody. The namePolypodium signifies many-footed, the rootstocks travelling onor near the surface of the soil, and, as in the well-known HaresfootFern (Davallia), the growing tips resemble more or less hairy point of fact, however, many species, the Davallias themselvesto wit, do the same thing, but belong to quite different genera, theactual generic distinction of the Polypodium family being a fruc-tification, consisting of round or oval masses of spore capsules,quite destitute of any protecting cover, so that the generic nameis another of those misleading ones which we have inherited fromthe old times when botanical knowledge was very imperfect. Polypodium Calcareum (Robertianum) (The Limestone Polypody) (Plate XXIV) This Fern, as regards make of frond, may be roughly describedas a slightly coarser and considerably larger edition of the Oak. PLATE XXIV. Poly podium phegoptei-is PolvnoJium drvonteris Polypodium calcnreum(Roberttanum) THE POLYPODIES 169 Fern, but with a less delicate shade of green, while its developingfronds (Fig. 190) do not divide at the outset into three ball-likependants, but form a crozier-shaped pendulous hook. It imitates
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1912
