FIGURES 25-32 - uploaded by Luz Elena Mateo-Cid
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Species of Pleonosporium: Pleonosporium pygmaeum, 25) Branch of sporophyte showing sessile polysporangia (arrow). Scale bar: 90 μm. Pleonosporium rhizoideum, Puerto Peñasco, Sonora (ENCB 16338). 26) Habit of sporophyte. Scale bar: 5 mm. 27) Basal portion of the thallus; note the attachment structure (arrow). Scale bar: 280 μm. 28) Branch tip of a sporophyte with curved branchlets. Scale bar: 100 μm. 29) Group of spermatangial clusters (arrow) borne on a single branch. Scale bar: 80 μm. 30) Group of mature carposporophytes (key), with carposporangia (arrow). Scale bar: 200 μm. Species of Spongoclonium: Spongoclonium caribaeum, Escolleras Tuxpan, Veracruz (ENCB VER-2017/A). 31) Branch tips from sporophyte showing branching axis and determinate lateral branchlets. Scale bar: 600 μm. 32) Ecorticate axis and determinate lateral branches. Scale bar: 300 μm.
Source publication
The tribe Spongoclonieae (Ceramiaceae subfam. Spongoclonioideae) is represented on the Atlantic and Pacific coasts of Mexico by two genera: Pleonosporium with eight species and Spongoclonium with a single species. Pleonosporium boergesenii and P. borreri are both new records for Atlantic Mexico. Known in Pacific and Atlantic Mexico, P. rhizoideum h...
Citations
During a genetic analysis of western Atlantic Wrangeliaceae J.Agardh, specimens closely related to the generitype of Lophothamnion J.Agardh fell into a clade including the generitype of the earlier described Pleonosporium Nägeli, causing us to subsume the former genus. Two new species are described, P. novae-angliae G.W.Saunders & C.W.Schneider, sp. nov. for specimens from southern New England and New York, United States, formerly identified there as P. borreri (Smith) Nägeli, and P. ricksearlesii C.W.Schneider & G.W.Saunders, sp. nov. from Bermuda. The relationship of Pleonosporium with its sister genus Spongoclonium Sonder is discussed with the transfer of Spongoclonium australicum Womersley to Pleonosporium.
Le genre australasien Lophothamnion J.Agardh se révèle génétiquement aligné avec Pleonosporium Nägeli (Wrangeliaceae, Spongoclonieae): nouvelles espèces de l'Atlantique occidental.
Au cours d'une analyse génétique des Wrangeliaceae J.Agardh de l'Atlantique occidental, des spécimens étroitement liés au généritype de Lophothamnion J.Agardh sont tombés dans un clade comprenant le généritype de Pleonosporium Nägeli décrit précédemment, nous obligeant à englober le premier genre. Deux nouvelles espèces sont décrites, P. novae-angliae G.W.Saunders & C.W.Schneider, sp. nov. pour les spécimens du sud de la Nouvelle-Angleterre et de New York, États-Unis, anciennement identifiés là-bas sous le nom de P. borreri (Smith) Nägeli, et P. ricksearlesii C.W.Schneider & G.W.Saunders, sp. nov. des Bermudes. La relation entre Pleonosporium et son genre frère Spongoclonium Sonder est discutée avec le transfert de Spongoclonium australicum Womersley dans Pleonosporium.
Background and Aims: Since the contributions of Dreckmann in 1998, and Ortega et al. in 2001, there are no other integrative studies for the Mexican Atlantic seaweeds in which modifications and taxonomic actualizations were considered for this regional phycological flora. Hence, our main objective was to present an update for the marine benthic red algae from the Mexican coast of the Gulf of Mexico, and the Mexican Caribbean Sea, in which all the new records are included for the region since the contributions mentioned above.
Methods: The information about the species was obtained through the analysis of all the specialized literature published for the region since 2001, as well as some previous records not considered before, and a revision of the databases of the UAMIZ Metropolitan Herbarium. Synonymy and nomenclatural status, as well as the classification system used, were revised in AlgaeBase.
Key results: A checklist composed of 451 species and 13 infraespecific categories of red algae was obtained; these where distributed in 4 classes, 23 orders, 52 families, and 171 genera. The currently accepted name, synonymy, and distribution are mentioned for each species. An asterisk indicates previous records (prior to 2002), as well as its distribution in different habitats.
Conclusions: The present contribution revealed two main changes to the previously known flora of the red algae from the study area. The first one falls in the domain of nomenclature, and implies a modification in their classification (families, genera, and species). The second one has an effect on the number of species present. As a consequence, it is evident that constant floristic monitoring is required along the coasts of the Mexican Atlantic.
