Notes on the Ecology of Iowa Lichens

Many interesting features are presented by this group of organisms, some of which have been investigated more or less thoroughly, while others have received comparatively little attention. The work with Iowa lichens has consisted almost entirely of reporting and describing species, with only very limited reference to structural modifications of thalli, and the relation between this and the ability of lichens to withstand adverse atmospheric conditions. In this, lichens are perhaps the most remarkable organisms in existence, and the full investigation of the secrets of this power offers an excellent field for the student of special problems