[105]

Reinke— Göttingen Nachrichten 1873

p 825 The glands at the tips of the serrations approach morphologically near to the nectar secreting organs on leaves.

p 826. In Prunus avium the leaf stalk bears near the lamina on each side small red fleshy trichomes; they stand on the borders of the channel which traverses the leaf stalk. They secrete nectar (by taste). They are not developed in very young leaves already out of the bud. They wither in the old leaves. They have a fibro-vascular bundle ending blindly. They arise out of the periblem of the young stem are are quite homologous with the serration glands of lamina, as shown by their structure and by the transition forms; for the lowest serrations on the lamina (in most leaves) secrete nectar instead of resin (harz)

Ch E

[Cross and self fertilisation, p. 403, n*: "An important memoir bearing on this subject has lately appeared by Reinke ('Göttingen Nachrichten' 1873 page 825), who shows that in many plants the tips of the serrations on the leaves in the bud bear glands which secrete only at a very early age, and which have the same morphological structure as true nectar-secreting glands. He further shows that the nectar-secreting glands on the petioles of Prunus avium are not developed at a very early age, yet wither away on the old leaves. They are homologous with those on the serrations of the blades of the same leaves, as shown by their structure and by transition-forms; for the lowest serrations on the blades of most of the leaves secrete nectar instead of resin (harz)."]