Dictyonema subinvolutum is a species of basidiolichen in the family Hygrophoraceae. It was described as a new species in 2022 by the Venezuelan lichenologist Vicente Marcano. The holotype was collected by Marcano and L. Castillo on 5 June 2020 from the cloud forests of Raiz de Agua in Mérida National Park (Parque Sierra Nevada de Mérida), Mérida, Venezuela. The specimen, designated as Marcano & Castillo 20-411, is housed in the herbarium of the Universidad de Los Andes (MER). The lichen was found growing on mosses and acidic soils in shaded, humid rainforest.