getting back to the question of ignorance being an appearance of the basis or not, here's Dudjom R. in the BiG rEd BoOk (pg54):
The doctrines or phenomena of samsara are originally caused by ignorance which arises in three interrelated aspects. Firstly, the ignorance of individual selfhood (bdag byid gcig pu'i ma rig pa) arises as consciousness, but is not recognized as such. Secondly, through the co-emergent ignorance (lhan cig skyes pa'i ma rig pa), the unconsciousness of the true essence and that consciousness emerge together. Yet it is thirdly, through the ignorance of the imaginary (kun tu brtag pa'i ma rig pa) that one's own perceptions are externally discerned. Since these three aspects arise diversely from a single essence, they arise from the ground as the appearance of the ground; and since this is not known to have been self-originated, the threefold which subjectively discerns objects is the causal condition of samsara.
then he quotes the sgra thal 'gyur:
The basis of bewilderment ('khrul pa) is ignorance.
Ignorance has three forms.
From the very moment of bewilderment, that same bewilderment arises as the ground-of-all (kun gzhi, alaya) in its role as the ignorance, the naturally obscuring expressive power, which is the unconsciousness of the true essence. Dependent upon that (ground of all) is the mind which is the consciousness of the ground-of-all and the six conflicting emotions which orignate from it.
so there is a progression of 1) ground to 2)ignorance arising as appearance of the ground, to 3)bewilderment arising based on that ignorance, to 4)the kun gzhi arising together with the bewilderment and becoming the basis of 5) mind and afflictive emotions.
Thoroughly tame your own mind.
This is (possibly) the teaching of Buddha.