B. Papp szerk.: Studia Botanica Hungarica 32. 2001 (Budapest, 2001)

Erzberger, Peter: Ditrichum crispatissimum (Muell. Hal.) Paris, a new species of the Hungarian bryoflora, and Ditrichum flexicaule (Schleich. ex Schwaegr.) Hampe in Hungary

94840. -9.VIII. 1953, Á. Boros -D. flexicaule with sporophytes, but otherwise unlike (b). BP 94836. - Dr. A. Boros: Plantae Hungáriáé exsiccatae. Ditrichum flexicaule (Schleich.) Hampe. Comit. Heves. In rupibus andesit. silvat. sept, montis Saskő prope Párád 27.IV. 1952. Alt. ca. 8-890 m. s. m. (Duplicates: BP 94837, leg. Á. Boros; BP 94838, leg. Á. Boros; BP 22860, leg. L. Vajda; BP 58739, leg. T. Poes et I. Gelencsér). This represents a very interesting form of D. flexicaule with plants up to 8 cm long., leaves to 4.6 mm long, but otherwise with typical character states of D. flexicaule. Originally, Boros and colleagues took it as a variety of Dicranodontium denudatum, but H. Persson, to whom the specimen was sent, wrote the following note: "The moss you sent to me is no Dicranodontium but a very curious form of Ditrichum flexicaule, very unlike what we are used to see. It is somewhat resembling but not identic with fo. longifolium (possibly a species, described from Yukon by Williams as D. giganteum and believed by the very clever Finnish bryologist M. M. Tuomikoski to be a species) but a parallel form. These very remarkable extreme flexicaule-formaQ have often troubled the bryologists." (Herman Persson, in litt. 12.VI.1953). Ditrichum flexicaule in Hungary The localities of D. flexicaule according to the revised specimens are shown in Figure 2. (A list of the specimens can be obtained from the author upon request.) It can be seen that D. flexicaule occurs predominantly in the calcareous hills in the northern (Aggteleki-karszt Mts, Cserehát Mts, Bükk Mts, Cserhát Mts, Gödöllő hills), central (Mt Naszály, Pilis Mts, Buda Mts, Gerecse Mts, Vértes Mts), and western (Bakony Mts, Balaton upland, Keszthely Mts) parts of the country, with more isolated records in the northwest near Sopron and in the south (Mecsek Mts, Villány Mts). In mountains of volcanic origin, D. flexicaule is rare (Mátra Mts: Sas-kő, Börzsöny Mts: Ördög-hegy/Nagymaros). Even more exceptional are records from sandy hills in lowland areas of the Danube valley: near Győr and Budapest (Káposztásmegyer). The distribution is in agreement with the data in BOROS (1968), ORBÁN and VAJDA (1983) and ORBÁN (1974), except that there appears to be no specimen from the Zemplén Mts in BP. Sporophytes of D. flexicaule are very rare in Hungary (BOROS 1968). They are obviously overrepresented in collected specimens, because specimens from 19 localities had sporophytes (or at least setae) (Table 2).