A l'entrée des allées où les arbres entrelacent le dédale ostéologique des branches, vague et blème, glabre et décharné, se dessine le Spectre.I understand this to mean something like the following:
At the entrance to the promenades, where the trees interweave the skeletal labyrinth of the branches, the Ghost appears, indistinct and pale, hairless and gaunt.Here is Odilon Redon's illustration for this passage:

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