habitat_substrate_larix
larix
Pycnia and aecia on Coniferae, especially Larix and Pseudotsuga, less commonly on Pinus and other genera. Uredinia and telia on species of Populus, especially Populus deltoides, and its varieties and hybrids P. balsamifera, P. nigra var. italica and others
Uredo medusae
Melampsora medusae