Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 8. (Budapest 1957)

Baksay, L.: The chromosome numbers and cytotaxonomical relations of some European plant species

range of the diploid are unknown to us. The species examined by us is exceedingly similar to the Balkanian ssp. elatior (Friv.) Murb., its further clarification needs chromosome counting from various other Iocatilies. Hakansson's member for ssp. biebersteini is n = 14 (4 x). 4. ! Pimpinella major (L.) Huds. 2n = 20 (2 x). See above locality. According to the counting of Schulz-Gaebel, 2n = 18. The whole family is euploid, there are very few polyploids among the species. Chromosome number 18 is probably not right. 5. Asperula montana W. et K. ( = Asperula cynanchica L. p. p.). 2n = 44 (4 x). Macskagödör, Mts. Vértes, Festuca sulcata — Carex humilis association; Mt. Nagyszénás, Nagykovácsi, Festucetum glaucae hungaricum association. The plant is of a Mediterranean origin, and has also a diploid. The name Asperula montana W. et K. refers to a species described from Hungary which is, according to the above examination, a tetraploid, to be conserved as a valid specific mame in the case the A. cynanchica named by Linné refers to a 2n = 22 species. A. montana is regarded by some authors as a variety and the chromosome number 2n = 22 was referred to it (H o m e y e r). 6. ! Mercurialis ovataSternb. et Hoppe, n = 16, 2n = 32 (4x). From the area of the Hungarian Central Mountains : Gyenesdiás, Csidervölgy, Quercetopubescentis ; Kígyósvölgy, Festuco-Brometum erecti ; Tihany, Csúcshegy, Quercetum ; Budakeszi, Fekete hegyek, Qu. pubescentis associations. 7. Mercurialis longistipes (Borbás) Baksay n = 32, 2n = 64 (8 x). Vérteskozma, Macskagödör ; Budapest, Hármashatárhegy, Quercetiim pubescentis ; Budapest : Széchenyihegy ; Szár. Zuppahegy ; Solymár, the Solymár Wall. In all three localities, from Querceto-Carpinetum associations. 8 * S • 8. Mercurialis perennis L. n = 21, 2n = 42 (2 x). Fánivölgy, Mts. Vértes ; Mt. Naszál, Vác ; Mélysár, Mts. Bükk. In all three localities, from Fagetum associations. Budapest, Szarvashegy, from a Querceto-Carpinetum association. M. perennis is a European-Mediterranean, mainly beechy species ; M. ovata is a Central European — SE Mediterranean, lanuginous oak forest species. The chromosome number of the former species was found by Pólya to be identical with the above, whilst M e u r m a n (1925) counted n = 32 in meiosis. The plant examined by M e u r m a n belonged therefore to M. longistipes. This latter species was considered by our specialists to be a transition between M. ovata and AL perennis, which was thought by Graebner to be a Mercurialis Paixii (M. ovataxperennis) hybride. Ai. longistipes is the polyploid of the species. M. ovata, but not an autopolyploid. The reductional division in the pollen mother cells, examined in very large quantities, was always normal,