Notes on Myxomycetes V. On the identity of the genera Cribraria and Dictydium

The genus Dictydium was created by SCHRADER (1797) for Cribrarialike forms lacking a cup. ROSTAFINSKI (1875) gave it its modern definition: i.e. having meridional costae which are joined at frequent intervals by fine, more or less parallel threads. He further created a genus Heterodictyon for a species (H. mirabile) which has ribs in the lower part and a Cribraria-like net in the upper. Massee in his monograph (1892) transferred Heterodictyon to Cribraria (C. mirabilis Mass.), pointing out that there is “every shade of transition between the two extremes,” and that Heterodictyon bienaszii Racib. i.e. ( Cribraria macrocarpa of the later monographs) “closely connects the genus Cribraria in the wider sense with Dictydium.” Jahn in 1901 described a variety “anomalum” of Dictydium umbilicatum (i.e. D. cancellatum Batsch), with a rigid stem “ohne die hakenformige Aufhangung in das Sporenkörbchen”, with a rather long sporangium, always without a cup, with the ribs merging into a Cribraria-like net in the upper part, and with a more persistent silvery peridium than is found in the typical form. He studied this taxon for some years, and came to the conclusion that it was not more than a variety of Dictydium umbilicatum. Later MEYLAN (Bull. Soc. Vaud. 44: 295. 1908) raised it to specific rank ( Dictydium anomalum), mentioning a similar variation in presence or absence of the cup as occurs in D. cancellatum, and never finding any “formes transitoires vers D. umbilicatum”. He further was of opinion that D. anomalum would probably be identical with Rostafinski’s Heterodictyon mirabile. In 1911 Lister reduced D. anomalum Meylan to his var. alpinum of D. cancellatum. In Bull. Soc. Vaud. 57: 305. 1932 Meylan went a step further, and sank Dictydium cancellatum (Batsch) var. alpinum Lister into Dictydium mirabile (Rost.) Meylan. In a later paper wherein G. LISTER describes D. rutilum (Journ. of Bot 71: 222, 1933), this author states that D. cancellatum var. alpinum is clearly the same as Rostafinski’s species, adding that Meylan considered this variety worthy of specific rank. Dr G. W. Martin (private communication, shortly to be published), agrees with Meylan that this taxon merits specific rank

An annotated list of Myxomycetes found in the Netherlands. Additions and emendations I

The following species and varieties were either found after my list of Myxomycetes from the Netherlands was published (Acta Bot. Neerl. 10: 80-98. 1961) or they are recorded because further study has convinced me of their vallidity of which I was doubtful at first. There was now no need to mark species that are not on Dr. Karstens’ unpublished list, as was done in my previous paper, as these are all new records for the Netherlands

O gênero Paradiacheopsis (Stemonitales, Myxomycetes) no Brasil The genus Paradiacheopsis (Stemonitales, Myxomycetes) in Brazil

Levantamento da diversidade de mixomicetos no Parque Estadual das Dunas do Natal, Unidade de Conservação de Mata de Duna Litorânea no Rio Grande do Norte e parte da Reserva da Biosfera da Mata Atlântica Brasileira, resultou no registro de Paradiacheopsis longipes Hoof & Nann.-Bremek., nova ocorrência para o Brasil e segunda para a Região Neotropical. Além de P. curitibana Hertel, conhecida apenas na localidade tipo, em Curitiba, PR, não se dispunha de registro de ocorrência de representantes do gênero para o Brasil. P. longipes é ilustrada e comentada quanto aos caracteres taxonômicos mais relevantes.<br>Slime molds diversity survey in the Parque Estadual das Dunas do Natal, a conservation area of coastal dune forest in Rio Grande do Norte and part of Biosphere reserve of Brazilian Atlantic Forest, resulted on the recording of Paradiacheopsis longipes Hoof & Nann.-Bremek., new occurrence for Brazil and second for the neotropical region. Besides P. curitibana Hertel, only known in the locality type, in Curitiba, PR, this genus was not registered before in Brazil. P. longipes is illustrated and comments about the most relevant taxonomic characters are made

Biogeographical assessment of myxomycete assemblages from Neotropical and Asian Palaeotropical forests

Aim Lowland/highland and Neotropical/Asian Palaeotropical assemblages of myxomycetes were compared to test the null hypothesis that neither species diversity nor species composition differs between the two ecoregions. This can be expected if myxomycetes behave as ubiquists and are capable of unlimited long distance dispersal. Location Four pairs (lowland/highland) of comprehensive regional surveys encompassing c. 7500 specimens were compared; these represented Neotropical (Yasuni/Maquipucuna in Ecuador; Guanacaste/Monteverde in Costa Rica) and Asian Palaeotropical forests (Cat Tien/Bi Dup Nui Ba in Vietnam; Chiang Mai in Thailand/South Luzon in the Philippines). Methods Each survey was carried out in an area characterized by relatively homogenous vegetation consisting of natural or near-natural forests, and incorporated both field collecting and the use of moist chamber cultures, and all observed fructifications were recorded. Analyses of diversity (i.e. richness) and community composition were carried out with EstimateS and R. Results Between 400 and 2500 records per survey were obtained. Species accumulation curves indicated moderate to nearly exhaustive completeness (70– 94% of expected species richness recorded). Multivariate analyses suggest that geographical separation (Neotropic versus Palaeotropic) explained the observed differences in composition of myxomycete assemblages better than habitat differences (lowland versus highland forests). Main Conclusion Both geographically restricted morphospecies and differences in myxomycete assemblages provide evidence that myxomycetes are not ubiquists but tend to follow the moderate endemicity hypothesis of protist biogeographyRussian-Vietnamese Tropical Scientific and Technological Centre/[01201255603]//RussiaNational Science Foundation/[DEB-9705464]/NSF/United StatesNational Science Foundation/[DEB-0102895]/NSF/United StatesNational Science Foundation/[DEB-0316284]/NSF/United StatesNational Geographic Society/[8890-11]//United StatesUS-Spain Science and Technology Fulbright Cooperation Program/[Ref.99075]//US-SpainGobierno de España/[CGL2014-52584P]//EspañaUniversidad de Costa Rica/[731-B4-072]/UCR/Costa RicaUniversidad de Costa Rica/[731-B5-062]/UCR/Costa RicaUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ingeniería::Instituto Investigaciones en Ingeniería (INII