Gymnocarpium-robertianum_7

Description:

Gymnocarpium robertianum (Hoffm.) Newman, syn.: Nephrodium robertianum (Hoffm.) Prantl, Lastrea obtusifolia (Schrank) JanchenScented Oakfern, Robert's Fern, DE: Ruprechtfarn, KalkfarnSlo.: apnenkaDat.: July 6. 2015Lat.: 46.36080 Long.: 13.70333Code: Bot_898/2015_DSC7670Habitat: light mixed forest, modestly inclined mountain slope, southeast aspect; colluvial, skeletal, calcareous ground, half shade, relatively warm and dry place; average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 595 m (1.950 feet), alpine phytogeographical region. Substratum: forest soil.Place: Lower Trenta valley, between villages Trenta and Soa, right bank of river Soa, close to Na melu place, East Julian Alps, Posoje, Slovenia EC Comment: Gymnocarpium robertianum is a common fern in Slovenia; hence it is easy to find. It grows everywhere in the Alps and in almost all other European mountains also in low elevations. However, there exist two species - Gymnocarpium robertianum and Gymnocarpium dryopteris, both common and wide spread, which are very similar in appearance. Gymnocarpium robertianum loves basic, calcareous ground, while Gymnocarpium dryopteris prefers acid ground. Distinguishing both types of ground is not always a simple task for a layman and therefore usually not a handy characteristics for separation of both species. Fortunately there exists another difference, which is a clear-cut trait. Leaf stalks and underside of Gymnocarpium robertianum are covered by small but conspicuous glandulous hairs (see Picture 7b) while Gymnocarpium dryopteris has none. Ref.:(1) M.A. Fischer, W. Adler, K. Oswald, Exkursionsflora fr sterreich, Liechtenstein und Sdtirol, LO Landesmuseen, Linz, Austria (2005), p 240.(2) A. Martini et all., Mala Flora Slovenije (Flora of Slovenia - Key) (in Slovenian), Tehnina Zaloba Slovenije (2007), p 105. (3) E.J. Jger, Rothmaler 3, Exkursionsflora von Deutschland, 11.Aufl., Elsevier, Spectrum (2007), p 23. (3) D. Aeschimann, K. Lauber, D.M. Moser, J.P. Theurillat, Flora Alpina, Vol. 1., Haupt (2004), p 90.