Revisão de myxomycetes ocorrentes em cana.de.açúcar (saccharum spp.) Em Brasil

Mediante la revisión de la literatura especializada se constató que la presencia de 33 especies de MYXOMYCETES en caña de azúcar (Saccharum spp.) en Brasil; las especies fueron encantadas en cañaveral y en bagazo de calia para fines industriales. Fuligo septica (Link) Wiggers, Craterium leucocephalum (Persoon) Ditmar y Lycogala epidendrum (L.) Fries son las especies más frecuentemente encontrados en este substrato

Myxomycetes collection preserved in the herbarium of the Federal University of Roraima (Brazil)

First records of myxomycetes in the North region of Brazil go back to the 19th 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

Myxomycetes do Canavial I: levantamento florístico em Carpina - Pernambuco Myxomycetes of sugar-cane plantation I: foristic survey in Carpina - Pernambuco state

Durante um ano investigou-se a ocorrência, freqüência e constância de Myxomycetes em um canavial da Estação Experimental do PLANALSUCAR, em Carpina-PE. As observações foram efetuadas nos meses de março, junho, setembro e dezembro, correspondentes a diferentes etapas do cultivo da cana-de-açúcar. Numa área de 1.134m2, observou-se um total de 40 touceiras, em cada mês de coletas, examinando-se folhas, colmos e raízes (vivos ou mortos), bem como a superfície do solo. Foram registradas oito espécies, todas pertencentes à subclasse Myxogastromycetidae: Cribraria splendens (Schr.) Pers. (Liceales); Arcyria cinerea (Buli.) Pers., A. deruidata (L.) Wett. e Trichia favoginea (Batsch.) Pers. (Trichiales); Craterirum leucocephalum (Pers.) Ditmar, Physarumnucleatum Ré x, P. nutans Pers. e P. cf. pezizoideum (Jung.) Pav. & Lag. (Physarales). No levantamento efetuado, a espécie mais freqüente foi C. leucocephalum (70,4%), as demais sendo de ocorrência rara (7,4 - 3,7%). Nenhuma espécie foi classificada como constante no canavial; C. leucocephalum foi registrada como acessória e as outras espécies como acidentais.<br>Myxomycetes from sugar-cane plantation I - Floristic Survey. Occurrence, frequence and constancy of Myxomycetes has been investigated on a sugar-cane plantation of the Experimental Station PLANALSUCAR, in Carpina, Pernambuco. The observations were carried out in March, June, September and December corresponding to differents stages of sugar-cane culture. Within an area of 1134m²/40 individuals were sampred at each month of collection. Their leaves, stems and roots (alive or dead) as well as soil surface were all examined. Eight species were recorded, all belonging to the subclass Myxogastromycetidae: Cribraria splendens (Schr.) Pers. (Liceales); Arcyriacinerea (Bull.) Pers., A. denudata (L.) Wett, and Tricchia favoginea (Batsch.) Pers. (Trichiales); Craterium leucocephalum (Pers.) Ditmar, Physarum nucleatum Rex, P. nutans Pers. and. P. cf. pezizoideum (Jung.) Pav. & Lag. (Physarales). In this survey, the species most commonly encountered was C. leucocephalum(70,4%), Whilst the other species had a low occurence (7.4%-3.7%). None of the species was classified as constant on sugar-cane plantations: C. leucocephalum (Pers.) Ditman has been registered as accessory, and the remainder as fortuitous