First records of myxomycetes in the North region of Brazil go back to the 19 th century. Nevertheless, the myxobiota of this region is still largely unexplored, with only 42 species recorded, distributed in 20 genera and seven families. The objectives of this paper were to characterize the Myxomycetes collection of the Herbarium of the Federal University of Roraima (UFRR) and to add new records for the myxobiota of this State. The collection holds specimens collected in fragments of Open Ombrophilous Forest, Seasonal Semi-deciduous Forest, Riparian Forest, deforested areas and urban home gardens in the state of Roraima. The 157 exsiccates were analyzed and identified or redetermined based on identification keys, descriptions and illustrations. The collection is in good conditions of preservation and includes all subclasses of Myxomycetes, 83% of its orders, 50% of its families, and 20 species. Trichiales, with one family, three genera and six species, represents 62% of all exsiccates. Cribraria aff. splendens, Metatrichia vesparia, Physarella oblonga, Stemonaria longa and Stemonitis splendens are new records for Roraima and Arcyria obvelata, Comatricha pulchella, Stemonitis pallida and Stemonitopsis aequalis are referred for the first time in the Northern Region, enlarging the knowledge of the Brazilian geographic distribution of these species. KEYWORDS: Brazilian Amazonia, biodiversity, biological collections, Neotropics Coleção de Myxomycetes conservada no Herbário da Universidade Federal de Roraima RESUMOOs primeiros registros de mixomicetos na Região Norte do Brasil remontam ao Século XIX. Todavia, a mixobiota desta região está ainda muito pouco explorada, com apenas 42 espécies registradas, distribuídas em 20 gêneros e sete famílias. Os objetivos deste estudo foram caracterizar a coleção de Myxomycetes do Herbário da Universidade Federal de Roraima (UFRR) e adicionar novos registros para a mixobiota deste estado. A coleção contém espécimes coletados em fragmentos de Floresta Ombrófila Aberta, Floresta Estacional Semi-decidual, Mata Ciliar, áreas desmatadas e quintais urbanos no estado de Roraima. As 157 exsicatas foram analisadas e identificadas ou redeterminadas com base em chaves de identificação, descrições e ilustrações. A coleção encontra-se em boas condições de conservação e inclui todas as subclasses de Myxomycetes, 83% das ordens, 50% das famílias e 20 espécies. A ordem Trichiales, com uma família, três gêneros e seis espécies, corresponde a 62% das exsicatas. Cribraria aff. splendens, Metatrichia vesparia, Physarella oblonga, Stemonaria longa e Stemonitis splendens são novos registros para o estado de Roraima e Arcyria obvelata, Comatricha pulchella, Stemonitis pallida e Stemonitopsis aequalis são referidas pela primeira vez para a Região Norte, ampliando a distribuição geográfica conhecida para estas espécies no Brasil. Myxomycetes collection preserved in the Herbarium of the Federal University of Roraima (Brazil)
Situated within the Atlantic Forest domain, the Centro de Endemismo Pernambuco (Pernambuco Center of Endemism) -CEPE is regarded as a priority for biodiversity conservation worldwide. Covering an area of approximately 56,000 km 2 , it encompasses part of the states of Alagoas, Pernambuco, Paraíba and Rio Grande do Norte in northeastern Brazil. Here we present an identifi cation key to 73 species of Myxomycetes that compose the known corticolous myxobiota of the Dense Ombrofi lous Lowland Forest, Semideciduous Lowland Forest, Restinga Forest and Mangrove environments of CEPE. Specimens included here were found developed in natural conditions in the fi eld or obtained through moist chamber culture. Among the species found, Arcyria cinerea, Clastoderma debaryanum, Cribraria confusa, C. violacea and Echinostelium minutum were the most common; and Comatricha longipila, Licea pedicellata, Paradiachaeopsis longipes, Perichaena calongei and Stemonaria fuscoides were the most rare. Our data indicates that the species richness of corticolous myxomycetes in rainforests is lower than that of temperate forests. Th ese same data also suggest that taxonomic diversity (mean number of species per genus) is similar to, or higher than, that found in temperate regions of the world.
-(Myxomycetes of the Scientific Herbarium Maria Eneyda P.K. Fidalgo (SP): species of Trichiaceae (Myxogastromycetidae, Trichiales). This article presents a review of the Trichiaceae collection of the SP Herbarium which holds 128 exsiccates mainly collected from Conservation Units of Atlantic Forest (Parque Nacional da Floresta da Tijuca and Parque Nacional do Itatiaia, Rio de Janeiro State; Parque Estadual das Fontes do Ipiranga and Reserva Biológica do Alto da Serra de Paranapiacaba, São Paulo State). Some specimens were collected from Amazon Forest (Pará and Rondônia States), Cerrado, (savanna-like vegetation), coastal environments, and urbanized areas (Minas Gerais and São Paulo States). The Trichiaceae collection is in well preserved conditions, with six genera and 15 species. Arcyria, with six species, represents 60% of all exsiccates. Arcyria denudata (L.) Wetts. is a new record for Pará State, enhancing the knowledge of this species geographic distribution in the Brazilian Amazon Region. A commented list of the species and exsiccates are provided herewith, including the typus of the genus Arcyriatella Hochg. & Gottsb.
The global distribution of Licea testudinacea is updated with a new record from a mangroveenvironment in Brazil. This myxomycete possesses a broad global distribution despite thescarcity of records, which is probably due to its small size and inconspicuous sporocarp color,which make it difficult to observe in the field. The species occurs on all continents, from sea levelup to elevations ≥3000 m, and is known to sporulate in several types of forests, grasslands, taigasand tundras. In the Neotropics, it has been recorded in Mexico, Guatemala and Costa Rica, in forestedand non-forested areas at high elevations and with high rainfall. The present study representsthe first record of the occurrence of L. testudinacea in South America and the first for a mangroveenvironment throughout its range. The record is based on sporulating specimens found on a livingtree of Rhizophora mangle (Rhizophoraceae) in the state of Pernambuco, Northeast Brazil. Thespecimens of L. testudinacea are described and illustrated. Characteristic features of its microhabitat,its global distribution and an identification key for sessile species with peridial dehiscence byplates and free and warted spores are presented.
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