Abstract. Let Ω be either the complex plane or the open unit disc. We completely determine the isomorphism classes ofand investigate some isomorphism classes ofwhere v is a given radial weight function. Our main results show that, without any further condition on v, there are only two possibilities for Hv, namely either Hv ∼ l ∞ or Hv ∼ H ∞ , and at least two possibilities for hv, again hv ∼ l ∞ and hv ∼ H ∞ . We also discuss many new examples of weights.1. Introduction. Fix a > 0 or a = ∞ and put aD = {z ∈ C : |z| < a} (i.e. aD = C if a = ∞). For 0 < r < a and f : aD → C put M ∞ (f, r) = sup |z|=r |f (z)|. Recall that M ∞ (f, r) is increasing with respect to r if f is a harmonic function ([5]).We want to investigate spaces of harmonic and holomorphic functions f where M ∞ (f, r) is unbounded in general but grows in a controlled way.