Organografia i malalties del cecidi de "Diastrophus rubi" (Bouché, 1834) Hartig, 1840 "(Hymenoptera: Cynipoidea: Cynipinae) a la tija de l'esbarzer, "Rubus caesius" L. "(Rosaceae)"

Resum

Study of the gall of the bramble stem under the microscope has led us to arrive at the following conclusions:
The epidermis, which in normal conditions is monostratal and cuticular, changes into the polystratal type and becomes suberose. An inversion is produced in the colenchyma and cortical parenchyma. The cortical parenchyma loses its chloroplasts and becomes thickly grouped into two to five layers of cells of the thin and prismatic type, changing into a smaller size and at the same time swelling. The parenchyma tissue located around the gall moves to the outside of the larvarian chambers surrounding the collecting veins. In this zone there are very many punctuations never seen in a healthy stem. The conducting veins lose the centripetal structure of dicotilodonous plants and take on an oval from where a large number of liberian veins surround little groups of woody veins. The sclerenchymatic tissue disappears almost completely, while a parenchymatic tissue appears in the inner part of the larvarian chamber (nutritious tissue) which is very thick. The markedly deformed medular parenchyma surrounds the whole of this structure. We have succeeded in finding for the first time in Europe a fungus belonging to the genus Phomopsis (Sphaeropsidea), a parasite of the bramble Rubus caesius L. (Rosaceae), and specifically of the gall of Diastrophus rubi (B.) (Cynipid).