American journal of pharmacy . ly absent in the root. On older roots irregular warts or swellings are frequently found,which, when sectioned, reveal a vigorous fungoid growth. Thefungoid hypha? ramify through the cells of the inner and especiallythe middle cortex, and in some places large cavities occur, resultingfrom the breaking down of the cortex cells. These are filled with Am. Jour. , 1899. / Gelsemiiim Sempervirens, Ait. 429 the coiled hyphae and the fructifications of the fungus. Starch isusualiy absent in the cells inhabited by the fungus. In the root ofa seedling about
American journal of pharmacy . ly absent in the root. On older roots irregular warts or swellings are frequently found,which, when sectioned, reveal a vigorous fungoid growth. Thefungoid hypha? ramify through the cells of the inner and especiallythe middle cortex, and in some places large cavities occur, resultingfrom the breaking down of the cortex cells. These are filled with Am. Jour. , 1899. / Gelsemiiim Sempervirens, Ait. 429 the coiled hyphae and the fructifications of the fungus. Starch isusualiy absent in the cells inhabited by the fungus. In the root ofa seedling about six weeks old, the fungus was already well estab-lished in many cortex cells. HISTOLOGY OF THE SEEDLING. The diarch condition of the root is continued in the hypocotyl,and it may at once be stated that the median plane of the two pro-toxylem masses corresponds to the median plane of the spiral tracheae of each end have at first a Y-shaped arrange-ment, the arms of the Y pointing toward each other, thus, —<. Fig. 3. >—, but as the hypocotyl increases in age, the cells of the armsmove apart, taking a lateral position, with the phloem external tothem, usually two patches to each side. This is illustrated in Fig. As differentiation proceeds more spiral tracheae are interpolatedbetween those already formed, so that a continuous ring ot proto-xylem is finally present. The phloem consists of small patches offinely divided cells, along the outer margin of the sides of thewood, but is not yet continued around the ends. At the level ofthe cotyledons, the phloem from the sides bends toward the ends,and the zone is thus completed. No recognizable internal phloemcould be distinguished in the young hypocotyl. 43° Gelsemium Sempervirais, Ait. {As™ptembef,bjS In an older hypocotyl, in which secondary growth has gone onfor some time, the fundaments of two internal phloem patches maybe observed just below the cotyledonary node. The round hypo-cotyl becomes elliptical
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Keywords: ., bookcentury1800, bookdecade183, booksubjectpharmacy, bookyear1835
