Among the Pteridosperms. Medullosa is to Neuropteris as a) Horneophyton is to Cooksonia b) Myeloxylon is to Alethopteris c) Collixylon is to Archaeopteris d) Asalophyton is to Rhynia The hypothetical processes of plantation and webbing are associated with a) the evolution of a coniferous microsporangiate strobilus b) the evolution of enations c) the evolution of megaphylls d) the evolution of microphylls Dictyosteles and solenosteles are types of a) Protosteles b) Siphonosteles c) Haplosteles d) Plectosteles .