Leptolyngbya sieminskae Richter et Matula

North East Land island (Nordaustlandet). Murchisonfjorden bay. Kinnvika bay. Snowbed with hollows and slightly patterned ground. Periodically with shallow stagnant water; black thick cyanobacterial mats among stones and mosses.

North East Land island (Nordaustlandet). Murchisonfjorden bay. Kinnvika bay. Black and brown, thick ridge cyanobacterial crusts covering soil or fine stones, silt and among mosses; marsh near lake.

Wet Spitsbergen island. The north shore of Hornsund fjord. Isbjørnhamna bay. Fuglebergsletta coast. Cyanobacterial mats in streams flowing though the mosses community marsh and in the shallow water at the edge of stream.

Wet Spitsbergen island. The north shore of Hornsund fjord. Isbjørnhamna bay. Fuglebergsletta coast. Massive cyanobacterial mats in water, on bottom, surface of stones and among growing mosses at the edge of seepages.

Wet Spitsbergen island. The north shore of Hornsund fjord. Isbjørnhamna bay. Fuglebergsletta coast. Snowbed and surfaces with shallow hollows periodically supplied by rain water, covered with black and brown, thick ridge of cyanobacterial crust with Anthelidium juretzkiana and mosess.

Wet Spitsbergen island. The north shore of Hornsund fjord. Isbjørnhamna bay. Fuglebergsletta coast. Shallow pond; cyanobacterial massive mats collected on the bottom from fine stones, sand and at the banks.