Dichodontium flavescens (Dicks.) Lindb.

Alegro, Antun, Šegota, Vedran, Rimac, Anja, Kiebacher, Thomas, Prlić, Dragan, Sedlar, Zorana, Vuković, Nina & Papp, Beata, 2019, New and noteworthy bryophyte records from Croatia, Cryptogamie, Bryologie 20 (2), pp. 5-13 : 7-8

Dichodontium flavescens (Dicks.) Lindb.

SPECIMEN EXAMINED. — Croatia. Gorski Kotar, Kupa River, after the confluence with Čabranka River near the village Gašparci, 45°30’27’’N, 14°46’28’’E, 256 m a.s.l., 03.VIII.2016, leg. and det. A. Alegro, V.

Šegota & A. Rimac s.n., conf. B. Papp, BP(BP193754), ZA(ZA45475, ZA45476, ZA45477, ZA45478); Gorski Kotar, Čabranka River, at the confluence with Kupa River, 45°31’32’’N, 14°41’58’’E, 291 m a.s.l., 03.VIII.2016, leg. and det. A. Alegro, V. Šegota & A. Rimac s.n., conf. B. Papp.

In the Kupa River, the species was growing in small patches, on periodically flooded, slightly inclined and not particularly shaded limestone rocks on riverbanks.The moss was well developed, but without capsules. The accompanied species were Brachythecium rutabulum , Cratoneuron filicinum , Fissidens crassipes Wilson ex Bruch & Schimp. , Hygrohypnum luridum (Hedw.) Jenn. , Marchantia polymorpha L.and Palustriella falcata (Brid.) Hedenäs , while in the running water only Cinclidotus riparius (Host ex Brid.) Arn. , Fontinalis antipyretica Hedw. and Rhynchostegium riparioides (Hedw.) Cardot were present. In the Čabranka River the species was scarce, also growing on periodically flooded limestone rocks on the riverbank, but in comparison to the previous locality the habitat was shaded by trees ( Alnus glutinosa (L.) Gaertn. and Salix alba L.). The specimens were without capsules. Other species found were Brachythecium mildeanum (Schimp.) Schimp. , B. rivulare , Cratoneuron filicinum and Fissidens crassipes . In the watercourse, bryophyte flora consisted of Cinclidotus aquaticus (Hedw.) Bruch & Schimp. , Fontinalis antipyretica and Rhynchostegium riparioides . Both localities are not situated in the Mediterranean part of Croatia. All examined specimens had acute, sharply and irregularly toothed leaf apex, weak teeth on dorsal surface of nerve and weak papillae on lamina cells, all of which are characteristic for D. flavescens ( Werner 2002) . On the other hand, ratio of leaf length and width was 4.0-4.2, which is close to values for D. pellucidum ( Werner 2002) . Although many authors have recognized it at species level (see Werner 2002), others have treated it as a variety of D. pellucidum ( Frey et al. 2006) , or placed it in the synonymy with the latter ( Brugués & Ruiz 2015), due to the uncertain delimitation of these taxa. D. flavescens is a Suboceanic Montane species ( Düll 1984), present in Western, Central and Northern Europe ( Hodgetts 2015). In SE Europe it is known only from Montenegro ( Papp & Erzberger 2011) and Romania ( Stefănuţ & Goia 2012), in latter being VU ( Stefănuţ & Goia 2012). From neighbouring countries it is known from Italy ( Aleffi et al. 2008).