Amanita smithiana, also known as Smith's amanita, is a species of agaric found on soil in coniferous (Abies, Tsuga, Pseudotsuga) and broadleaved (Alnus, Quercus) woodland in the Pacific Northwest of North America.
Wild Agarikon is only found in old-growth forests, and grows on conifers, particularly Douglas-fir (Pseudotsuga) and larch (Larix).
The larvae feed on a wide range of plants, including various broadleaved and coniferous trees and ferns, for instance Eucalyptus, Quercus, Acacia, Larix, Picea, Pinus and Pseudotsuga species.
Caterpillars of Declana from New Zealand, also tentatively placed in the Nacophorini, have been found on Myrtaceae (eucalyptus, Kunzea and Leptospermum), Pinaceae – larches (Larix), pines (Pinus, notably Monterey Pine, P. radiata) and Coast Douglas-fir (Pseudotsuga menziesii) –, and southern beeches (Nothofagaceae).
Larvae feed on various deciduous and coniferous trees and shrubs, including Pseudotsuga, Tsuga, Abies, Picea, Salix, Betula papyrifera, Corylus, Fragaria and carrot Daucus.
Rhizopogon vinicolor is one such which is associated with the Douglas-fir (Pseudotsuga spp.).