. Fig. 135.—Sderotinia vaccinii on Vitis-Idaea. Mummified Cowberries in fresh condition and in the following May, after development of A, Chain of conidia united by disjunctors. B, Germinating conidium after treat- ment with iodine ; the plasma has shrunk, but remains connected with the sporidia in process of abjunction. (After Woronin.) (Fig. 135). It has its origin as follows: The conidia at first lie closely end to end, enclosed in a delicate primary membrane ; the partition-membranes split into two lamellae, each of which takes part in the formation of a cellulose
. Fig. 135.—Sderotinia vaccinii on Vitis-Idaea. Mummified Cowberries in fresh condition and in the following May, after development of A, Chain of conidia united by disjunctors. B, Germinating conidium after treat- ment with iodine ; the plasma has shrunk, but remains connected with the sporidia in process of abjunction. (After Woronin.) (Fig. 135). It has its origin as follows: The conidia at first lie closely end to end, enclosed in a delicate primary membrane ; the partition-membranes split into two lamellae, each of which takes part in the formation of a cellulose body which gradually becomes spindle-shaped. In the course of its growth this cellulose body—the disjunctor—ruptures the primary enclosing membrane, and, being released, becomes more elongated, so that the conidia are pushed away from each other and fall apart. The conidia have a strong characteristic odour of almonds, attractive to insects, which carry off the conidia and dust them on the stigmata of other Vaccinium flowers. Wind is also, in all probability, an agent in the distribution of the conidia. The
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
