Náttúrufræðingurinn - 1964, Síða 73

N ÁTT Ú RII F RÆ ÐINGURINN
165
maintains that it is the only Hieracium species of the Section Alpestria which
grows in tliis part of the country. l’he author’s investigations liave made clear
that other Alpestria-species wliich have been described from NW. must be
referred to H. elegantijonne viz.: H. paurocyma Om. and H. tapeinocephalum
Om. (As lo H. oxyodontophorum Oskarss. from Brjánslækur, its sectional
position may be doubtful).
Tlien the author points out that H. elegantijorme and H. thulense Dalilst.
have frequenlly connnon habitats. Therefore he concludes that these two
species are of similar age in the country and of a very old origination.
Lastly the authoi discusses the origin of H. elegantiforme, and he supposes
that its true ancestor has been growing in North Europe long ago, and it has
later split into many unities which now-a-days are represented by well definite
species. Therefore the autlior is of the opinion that H. eleganliforme is one
of these unities which has localized in Iceland and variegated in its own way
from the beginning of Pleistocene.
HEIMILDARIT - REFERENCES
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