. Plants and their uses; an introduction to botany . Fig. 368.—Fern Brood-bud (Aspidium Filix-mas) on base of leaf-stalk, j. (Luerssen.) THE FERNS 541. Fig. 369.—Scouring-rush (Eqiiisetum arrense, Scouring-rush Family,Equisetacece). 1, spore-bearing shoot with erect branches ending incone-like clusters (a) of sporophylLs or sporangia-bearing leaves. 2, vege-tative shoot, with underground stem bearing tubers (a) gorged withfood. 3, a sporophyll with sporangia, enlarged. 4 same, showingsporangia split open after discharging the spores. 5, 6, 7, spores withelaters wrapping closely, or more or les
. Plants and their uses; an introduction to botany . Fig. 368.—Fern Brood-bud (Aspidium Filix-mas) on base of leaf-stalk, j. (Luerssen.) THE FERNS 541. Fig. 369.—Scouring-rush (Eqiiisetum arrense, Scouring-rush Family,Equisetacece). 1, spore-bearing shoot with erect branches ending incone-like clusters (a) of sporophylLs or sporangia-bearing leaves. 2, vege-tative shoot, with underground stem bearing tubers (a) gorged withfood. 3, a sporophyll with sporangia, enlarged. 4 same, showingsporangia split open after discharging the spores. 5, 6, 7, spores withelaters wrapping closely, or more or less spread. (Wossidlo.)—Common in moist places. ripe suddenly straightens, so as to rupture the thin wall in front andeject the spores. Sporangia of this type although differing in manywajS from those of the adder-tongue and its kin, are doubtlesshomologous with them, for students of ferns find a very completeseries of intermediate forms connecting the extremes. Vegetative 542 LIFE^HISTORIES reproduction is sometimes accomplished in ferns by the formationon various parts of buds whicli fall to the ground and take root(see Fig. 36S). Filicini3D
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
