caa a22 4500 378925180 CHVBK 20180305123615.0 cr unu---uuuuu 161128e20040226xx s 000 0 eng 10.1515/BOT.2004.005 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2004.005 The morphology and reproductive structures of Mediterranean species of the genus Nemastoma J. Agardh, nom. cons. (Nemastomataceae, Nemastomatales): Nemastoma dichotomum and N. dumontioides [Elektronische Daten] [Conxi Rodríguez-Prieto, Alba Vergés, Noemí Sánchez, Lluís Polo, Marc Verlaque] We investigated a collection of Nemastoma J. Agardh, nom. cons. (Nemastomatales, Rhodophyta), including the Mediterranean type material of species described by J. Agardh, Kützing and Ercegovic, and recent specimens from the Mediterranean Sea, Adriatic Sea and northeastern Atlantic Ocean. Based on their habit and vegetative and reproductive structures, we confirm that: (i) all the Mediterranean specimens studied belong to the genus Nemastoma; (ii) two species of Nemastoma co-exist in the Mediterranean Sea: (a) N. dichotomum, which is characterized by great plasticity of habit, a cartilaginous thallus in its basal and middle parts, and presumed reproduction exclusively by apomixis; and (b) N. dumontioides, which is characterized by a regularly pseudodichotomous, saccate-membranous thallus, and which reproduces both sexually and probably apomictically; and (iii) the Atlantic specimens attributed to N. dichotomum belong to other genera, and so, N. dichotomum is probably endemic to the Mediterranean Sea. Thus, three species described by Kützing have been reduced to varieties of Nemastoma dichotomum: (a) var. biasolettianum (Kützing) Rodríguez-Prieto, Verlaque et Vérges comb. nov. et stat. nov., with ligulate upper parts, (b) var. caulescens (Kützing) Rodríguez-Prieto, Verlaque et Vérges comb. nov. et stat. nov., with wedge-shaped upper parts, and (c) var. incrassatum (Kützing) Rodríguez-Prieto, Verlaque et Vérges comb. nov. et stat. nov., with spathulate upper parts. Finally, Nemastoma constrictum and N. constrictum var. longitrichogynum are placed in synonymy with N. dichotomum var. caulescens. Copyright © 2004 by Walter de Gruyter GmbH & Co. KG Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Rodríguez-Prieto Conxi aut Vergés Alba aut Sánchez Noemí aut Polo Lluís aut Verlaque Marc aut Botanica Marina Walter de Gruyter 47/1(2004-02-26), 38-52 0006-8055 47:1<38 2004 47 botm https://doi.org/10.1515/BOT.2004.005 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2004.005 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rodríguez-Prieto Conxi aut NATIONALLICENCE 700 1- Vergés Alba aut NATIONALLICENCE 700 1- Sánchez Noemí aut NATIONALLICENCE 700 1- Polo Lluís aut NATIONALLICENCE 700 1- Verlaque Marc aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 47/1(2004-02-26), 38-52 0006-8055 47:1<38 2004 47 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter