​Type: Sardinia, Massif of Mte Gennargentu, in crevices of the silicate rocks at the east face of Mt Spada near the NW ridge at c. 1500 m alt., close to a plant of D. tyrrhena and with a plant of D. abbreviata c. 10 m away, 25 July 1974. Fraser-Jenkins & Reichstein 3175. Holotype G; lsotypes B, BM, F I, K, P (fig 4). We took 2 pieces of rhizome, one (TR-3775 ) is cultivated in Basel and one (CRFJ-4309 ) in Abingdon. (Fern Gaz. 11: 193 (1975))