Situated within the old-growth boreal forests of Finnish Lapland, the site exists as an ecological archive whose continuity has been progressively fragmented through contemporary forest management practices. Logging roads, canopy clearings, and managed planting grids disrupt the forest’s ability to regulate light, humidity, and temperature, dismantling the microclimatic conditions required for microspecies such as lichens, mosses, and fungi to survive. Growing over decades and absorbing moisture directly from the atmosphere, these organisms function as indicators of permanence, appearing only within undisturbed forest systems. Their disappearance signals both ecological rupture and the erosion of forest memory. The Lichen Archive operates as a speculative research framework that reappropriates forest management infrastructures and byproducts to redistribute substrates and attenuate light, stabilizing microclimates within fragmented canopies. Through temporary, dismantlable outposts and monitored experiments, architecture acts as a temporal scaffold rather than a permanent form, enabling regrowth while leaving behind living archives of ecological repair.