In the course of preparing a concise account of the gymnosperms of Michigan, I have become aware how poorly represented most of these plants are in the herbaria of the state. Distribution maps based on currently known specimens may be quite misleading compared to the actual ranges of the species concerned. Hence, a series of preliminary county-distribution maps is here presented, in the hope that it will imspire botanists in the field this summer to improve, by making good collections, the basis for future maps. Only native (not planted) individuals should be collected for this purpose.