Hygrohypnum cochlearifolium (Venturi) Broth. and Orthotrichum pallens Bruch ex Brid. var. johnseniae Vitt were found in Malheur National Forest in Oregon. Both are newly documented mosses for the state of Oregon. Thorough surveys in areas not documented well in the past have brought about new findings.

Cladonia robbinsii is reported here for the first time in the provinces of Manitoba and Ontario, Canada, and distinctions between it and similarly sterile and/or squamulate Cladonia species found in those provinces are discussed.

The second North American locality of the moss Trematodon laetevirens Hakelier & J.-P. Frahm was discovered during the installation of vegetation monitoring plots within Wrangell-St. Elias National Park and Preserve. We discuss site characteristics for this collection and other relevant finds from our non-vascular community observations including Herbertus aduncus (Dicks.) A. Gray, Oreas martiana (Hoppe & Hornsch.) Brid., and Plagiomnium insigne (Mitt.) T. Kop.

Mosses are remarkably successful plants that colonize a variety of habitats. They have specific requirements with regard to microenvironments factors such as temperature, light and water availability and substrate chemistry. The occurrence of a particular species may reflect the microclimate of the locality. Pleurocarpous mosses form extensive cover on the substrate and provide microenvironment for the activity of bacteria, fungi and invertebrates, thus constituting a kind of bryosystem. Present study has revealed 42 species of pleurocarpous mosses belonging to 30 genera and 16 families from Imphal district, Manipur, India. Hypnaceae are found to be most frequent. Majority of taxa are found as epiphytic growing on tree bark and branches. Erpodium mangiferae, Erythrodontium julaceum, Pterygynandrum decolor, Fabronia assamica are found most widely spread in the studied area. It seems that these species have high tolerance and adaptability to survive in the dry bark. Most of the pleurocarpous mosses in the present collection display mat form.

Calypogeia suecica is reported for the first time for New Brunswick, Canada. It occupies microhabitats consistent with previous records in adjacent jurisdictions (Nova Scotia, Ontario, Quebec, and Maine): rotting wood in conifer-dominated forests.