2026

Gymnocalycium subgenus Pirisemineum – a reconsideration
Schädlich, V.; Barfuss, M. H. J. (2026): Gymnocalycium subgenus Pirisemineum – a reconsideration (part 1) - Schütziana 17(1): p. 5-20.
An expansion of the subgenus Pirisemineum, which has so far comprised merely the species Gymnocalycium zegarrae and G. pflanzii, is presented. Based on molecular genetic research and morphological features the subgenus is rearranged and expanded by the species G. cabreraense, G. chacoense, G. chiquitanum and G. paediophilum.

Gymnocalycium justomarquezii R. Kiesling & Metzing 2026
Kiesling, R.; Metzing, D. (2026): A new Gymnocalycium species (Cactaceae) from Valle Fértil, San Juan, Argentina. - Bol. Soc. Argent. Bot. 61 (2), p. 269-279.
Type: Argentina. San Juan Province, Valle Fértil Department, Las Juntas, Potassium feldspar outcrop, 1725 m, X-2010, R. Kiesling 10405 (Holotype, MERL, 65929). Argentina. San Juan Province, Valle Fértil Department, Las Juntas, Camino a Sierra de Chavez, 1815 m, 3-XII-2021, R. Kiesling 10674 (Paratype: MERL, 67192).

Gymnocalycium pungens subsp. saladense Kulhánek, Schädlich, Chiurco, R. Sperling & Barfuss 2026
Kulhánek, T.; Schädlich, V.; Chiurco, E.; Sperling, R. & Barfuss, M. H. J. (2026): The discovery of a new subspecies of Gymnocalycium pungens Fleischer ex Milt from the species’ presumable southernmost distribution area in the Province of Santa Fé, Argentina. - Schütziana 17 (2), p. 6-37.
Type: Argentina. Prov. of Santa Fé: W of Vera y Pintado (SW of Calchaqui), on halo-hydromorphic soils on the border of degraded algarrobal vegetation (Prosopis sp.), alt. 51 m a.s.l., leg. 5 February 2017, José A. Mattiazzi s.n., gathered as “Gymnocalycium sp. Calchaqui”, grown from seeds, ex cult. coll. Tomáš Kulhánek (holo [body] WU0174481, wu.jacq.org/object/WU0174481, iso [flower] WU0174482, wu.jacq.org/object/WU0174482; same gathering, grown form seeds, ex cult. coll. Volker Schädlich (para [seedlings] WU0174483, wu.jacq.org/object/WU0174483).