Language: English
Volume 12 contains the following two contributions:
- Mosses collected from Koli, North Karelia, Finland by T. Koponen in 1964; habitats substrates, an estimation of frequencies and conservation / T. Koponen
- Mosses collected in Pisa Strict Nature Reserve in northern Finland by Aune and Timo Koponen in 1964-66; habitats, substrates, an estimation of frequencies and conservation / T. Koponen and T. Ulvinen