The highest level is tundra dominated by cyperus Kobresia sibirica and peaty meadows of sedge Carex spp. with stone birch Betula ermanii on stony talus, and lichen Cladonia - or Cetraria-covered rocks and cliffs. 600 species of vascular plants have been recorded including 20 species of flowering plants.    From Wordnik.com.  [Lake Baikal Basin, Russian Federation] Reference

The principal food of the reindeer in the barren grounds consists of the Cetraria nivalis and cucullata, Cenomyce rangiferina, Cornicularia ochrileuca, and other lichens, and they also eat the hay or dry grass which is found in the swamps in autumn.    From Wordnik.com.  [The Journey to the Polar Sea] Reference

Polyzonal Different zones in the Holarctic; within the tundra zone usually in local habitats and wet depressions Soil algae; the mosses Hylocomium splendens sensu lato, Aulacomnium turgidum, and Racomitrium lanuginosum; the liverwort Ptilidium ciliare; the lichens Cetraria islandica, Psora decipiens, and Cladina rangiferina; the vascular species Cardamine pratensis, Chrysosplenium alternifolium, and Eriophorum angustifolium; the sedge Carex duriuscula; the herb Helictotrichon krylovii; and the moss Tortula ruralis Common raven (Corvus corax), peregrine falcon (Falco peregrinus), white wagtail (Motacilla alba), northern wheatear (Oenanthe oenanthe) Wolf (Canis lupus), ermine (Mustela erminea), weasel (M. nivalis), voles (Microtus gregalis and M. oeconomus), and the mite Chiloxanthus pilosus Zonal boreal Not abundant and constrained to the southern Arctic in benign habitats such as river valleys, south-facing slopes, and wet areas Tree species of Larix; the orchid Corallorrhiza; the shru.    From Wordnik.com.  [Implications of current species distributions for future biotic change in the Arctic] Reference