. The American florist : a weekly journal for the trade. Floriculture; Florists. enlarged and much lobulated, as shown in fig- ure 20, and in age t hese become dark colored. The mycelium in agar cultures presents two conditions, a normal condi- tion rather finely granular and richly vacuolate, and an abnor- mal condition, the threads much greater in ^"^ j^ diameter, the ^ /* protoplasm coarsely gran- ular, and the walls of the cells frequentfy rup- ture without ex- ternal disturb- ance, when the protoplasm es- capes in clouds. This study of the structure and development of the carnation a
. The American florist : a weekly journal for the trade. Floriculture; Florists. enlarged and much lobulated, as shown in fig- ure 20, and in age t hese become dark colored. The mycelium in agar cultures presents two conditions, a normal condi- tion rather finely granular and richly vacuolate, and an abnor- mal condition, the threads much greater in ^"^ j^ diameter, the ^ /* protoplasm coarsely gran- ular, and the walls of the cells frequentfy rup- ture without ex- ternal disturb- ance, when the protoplasm es- capes in clouds. This study of the structure and development of the carnation anthracnose reveals a plant quite distinct morphologically from Colletotrichnm, or indeed from any member of the group to which the common name anthracnose is usually applied. The stroma is not formed in a true pustule, as is the case with the Melaiiconineas to which Colletotrichinn belongs.* It is formed into a compact stool or t u f t, and elevated a considerable distance above the substratum, and consequent- ly occupies an intermediate position be- tween this group and tlif more c 1 e a r 1 }• recognized Hy- sterilized bean stems lified stem very little elongated, the leaves also quite short and crowded or rosetted upon the stem. Figure 21 is from a pho- tograph of a rosetted carnation. Evi- dently some disturbance interfered with the interstitial growth of the stem. Sections of the stem, presented here and there discolored spots in the medulla or pith, through the cells of which fungus threads ramified in all directions. Cul- tures from the medulla of such plants in nearly all cases, produced a species of Fusariwn, but in some cases bacteria. The parenchyma in many cases, in the medulla, had become corky. One or the other of these organisms probably was responsible for this pathological condi- tion, but without careful inoculations and a comparative study oi the results no decision can be reached. When the plant dies, which it proceeds to do with- out flowering, the fungus
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
