. The American florist : a weekly journal for the trade. Floriculture; Florists. ?JC> cells of which fungus threads ramified in all directions. Cul- tures from the me- dulla of such plants, in nearly all cases, produced a species of Fusarium, but in some cases bacteria. The parenchyma in many cases, in the medulla, had become corky. One or the other of these organ- isms probably was re- sponsible for this pathologi c a 1 condi- tion, but without careful inoculations and a comparative study of the results no decision can be reached. When the plant dies, which it proceeds to do with- o u t fl
. The American florist : a weekly journal for the trade. Floriculture; Florists. ?JC> cells of which fungus threads ramified in all directions. Cul- tures from the me- dulla of such plants, in nearly all cases, produced a species of Fusarium, but in some cases bacteria. The parenchyma in many cases, in the medulla, had become corky. One or the other of these organ- isms probably was re- sponsible for this pathologi c a 1 condi- tion, but without careful inoculations and a comparative study of the results no decision can be reached. When the plant dies, which it proceeds to do with- o u t flowering, the fungus in the medul- la combines the force of its growth into an anostomosing weft in the form of a wedge, with the point direct- ed outward, and lit-. Fusarium spores, a, before ger- Fi?. 24. Fnsaruim, threads in a^'sir ( out. First through the woody ring, next a broad band of sclerenchymatous tissue, a band of paren- chyma and the epidermis to the outside where it ex- pands into a fruiting stool the basidia of which bear numerous long, curved, fusoid, 3 to 7 septate spores, as shown in Fig- ure 22. Figure 23a repre- sents some of the spores more highly magnified. Figure 23b spores germi- nating. In germinating each cell of the spore ex- cept the end one can de- velop a germ tube. Before germinal ion, however, ,, , ., minatiug; b, germinating: maguified 30 erally wedges its way timis more than the scale. From agar culture. each cell swells into nearly a spherical form. It may be that in the cutting bed the cut end of the stem does not heal properly, or so slowly that the exposed medulla partially decomposes, thus affording a nidus for the Fusarium, or bacteria, and when the cut is healed externally these organisms are impris- oned in the pith. Their presence and the partially decayed tissue would affect the adjoining tissue, and grad- ually more and more of the pith would be laid under contri1)iitinn to the organism. "niiNNmc ; It is said of m
Size: 1109px × 2254px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
