Showing papers by "Marcelo Pinto Marcelli published in 2010"
TL;DR: O levantamento das especies pertencentes aos generos de grandes parmelias do litoral centro-sul do Estado de Sao Paulo revelou a ocorrencia of nove espe species de Parmotrema sensu stricto, contendo como constituintes quimicos medulares os acidos norstictico ou salazinico.
Abstract: O levantamento das especies pertencentes aos generos de grandes parmelias do litoral centro-sul do Estado de Sao Paulo revelou a ocorrencia de nove especies de Parmotrema sensu stricto (talos foliosos de lobos arredondados em geral com mais de 0,5 cm larg. com margens inferiores nao rizinadas) contendo como constituintes quimicos medulares os acidos norstictico ou salazinico. Sao tipicamente reconhecidos pela cor amarela que se torna avermelhada resultante dos testes de coloracao com hidroxido de potassio. Sao apresentados uma chave de identificacao, descricoes, comentarios e ilustracoes, baseados em material brasileiro.
16 citations
TL;DR: The highest species diversity was recorded in the Araucaria plantation while the greatest occurrence of shade tolerant taxa was found in the native AraUCaria forest type, which may be related to the host-tree characteristics found in these areas.
Abstract: Lichenized fungi are epiphytic components of forest areas where anthropogenic activities may cause changes in species composition and spatial distribution. The aim of this work is to evaluate how the lichen community is distributed on native and planted vegetation, and also to investigate possible preferences of the lichen community for specific host trees related to bark pH values. A total of 120 host-trees distributed in 12 remnants of native and planted vegetation were analyzed: native Araucaria forest and Araucaria, pine and eucalyptus plantations. Additional samples of lichenized fungi were collected in all vegetation types and adjacent trails, using a non-systematic sampling protocol. One hundred thirteen taxa of lichenized fungi were recorded, of which 78 species originated from the survey comparing the four habitats and 35 were added by additional collections. The highest species diversity was recorded in the Araucaria plantation while the greatest occurrence of shade tolerant taxa was found in the native Araucaria forest type. The largest number of lichen taxa was recorded on host-trees with basic bark pH. The wide variety of lichen community composition and distribution registered may be related to the host-tree characteristics found in these areas.
16 citations
TL;DR: In a survey of the species pertaining to genera of large parmeliae occurring in the coastal areas of the central-southern coast of Sao Paulo state, Brazil, seven species of Parmotrema sensu stricto containing equinocarpic or stictic acids as the main medullar substances were found.
Abstract: In a survey of the species pertaining to genera of large parmeliae occurring in the coastal areas of the central-southern coast of Sao Paulo state, Brazil, seven species of Parmotrema sensu stricto (foliose thalli with rounded lobes usually more than 05 mm wide with nude lower margins) containing equinocarpic or stictic acids as the main medullar substances were found These are typically recognized by the strong yellow- staining potassium hydroxide spot test An identification key, descriptions, comments, and illustrations based on Brazilian material are provided for these species
11 citations
01 Mar 2010
TL;DR: In a survey of the species pertaining to genera of large parmelioid lichens occurring in the coastal areas of the center-south coast of Sao Paulo State, Brazil, four species of Parmotrema A. Massal with medullar fatty acids and one containingMedullar atranorin were found.
Abstract: O levantamento das especies pertencentes aos generos de grandes parmelias do litoral centro-sul do Estado de Sao Paulo revelou a ocorrencia de quatro especies de Parmotrema A. Massal. com acidos graxos medulares (P. ciliiferum, P. cf. cryptoxanthoides, P. melanothrix e P. praesorediosum) e uma com atranorina medular (P. mordenii). Sao apresentados chave de identificacao, descricoes detalhadas, comentarios e ilustracoes baseadas no material coletado.
8 citations
TL;DR: Six species of Punctelia with black lower surface lacking vegetative propagules are taxonomically revised, and P. borrerina (Nyl.) Krog is regarded as a synonym of P. microsticta (Müll. Arg.), as previously thought.
Abstract: Six species of Punctelia with black lower surface lacking vegetative propagules are taxonomically revised. Lectotypes are designated for P. borrerina, P. microsticta and Parmelia borreri var. allophyla. Punctelia involuta Canez & Marcelli is described as new. Punctelia borreri var. allophyla Kremp. is regarded as a synonym of P. borrerina (Nyl.) Krog, instead of P. microsticta (Mull. Arg.) Krog, as previously thought. Punctelia jujensis Adler is recorded for the first time for Brazil. All the species of this group occur in Brazil.
7 citations
7 citations
TL;DR: The anatomical characteristics are constant for the Parmotrema group studied, including the presence of epicortex, the upper cortex anatomy and the characteristics of rhizines and ciliae.
Abstract: Using conventional techniques for structural studies under conventional microscopy, polarizing light microscopy and scanning electron microscopy this work describes and compares the thallus anatomy of two Parmotrema species with reticulate maculae, previously included in the genus Rimelia: Parmotrema cetratum (Ach.) Hale and P. clavuliferum (Rasanen) Streimann. The data showed that the species are anatomically similar, including the presence of epicortex, the upper cortex anatomy and the characteristics of rhizines and ciliae. In the medulla of the two species there are star-shaped clusters of hyphae associated with the presence of salazinic acid. This study showed that the anatomical characteristics are constant for the Parmotrema group studied.
6 citations
TL;DR: During a survey of the Parmeliaceae in natural ecosystems and urbanized coastal areas of southeastern Brazil, two new Parmotrema species containing alectoronic acid were discovered: P. hyperlaciniatulum and P. restingense.
Abstract: During a survey of the Parmeliaceae in natural ecosystems and urbanized coastal areas of southeastern Brazil, two new Parmotrema species containing alectoronic acid were discovered: P. hyperlaciniatulum and P. restingense. These species are described and compared to P. subrugatum.
6 citations
TL;DR: It is indicated that there is a pattern in the structure of the upper cortex in all the three groups of Parmotrema species studied here, and this pattern can be used to place each species group separately within the genus ParmOTrema.
4 citations
TL;DR: As caracteristicas anatomicas incluindo a espessura da medula, o padrao de orientacao das hifas, espessURA das rizinas e inclusoes de cristais aparentemente possuem um importante papel adaptativo para o sucesso de C. texana nos cerrados brasileiros.
Abstract: Conventional techniques for structural studies under light microscope and scanning electron microscope were employed to describe the histology of thallus in Canoparmelia texana, a lichen with wide distribution in open environments and fairly common in the cerrados and urban areas of Brazil. This study describes a new type of cortical organization for the family Parmeliaceae, in C. texana the upper cortex is lacunar, showing a large quantity of small intercellular spaces or lacunae. The anatomical features including medulla thickness, hyphal orientation pattern, rhizines thickness and crystals inclusions have an important adaptive role for the success of C. texana in Brazilian cerrado, a savanna-like ecosystem.
4 citations
01 Dec 2010
TL;DR: The obtained data showed that the species are not anatomically similar, including the aspects of epicortex, upper cortex anatomy and the rhizinae characteristics.
Abstract: Utilizando tecnicas convencionais para estudos histologicos em microscopia de luz com auxilio de luz polarizada, se descreve e compara a anatomia do talo de duas especies de Parmotrema, Parmotrema consors e Parmotrema cf. reparatum, com rizinas dimorficas e maculas efiguradas, antigamente incluidas em Canomaculina. Os dados obtidos neste estudo mostram que as duas especies sao anatomicamente distintas em relacao as caracteristicas do epicortex, cortex superior e rizinas. Parmotrema cf. reparatum e anatomicamente similar ao grupo de Parmotrema com maculas reticulares (antigamente incluidas em Rimelia) previamente estudados. Os polissacarideos tipicos do epicortex e cortex superior do grupo de especies de Parmotrema com rizinas dimorficas possuem diferenciacao histoquimica daqueles mencionados para o epicortex e cortex superior do grupo de Parmotrema com maculas reticulares.
10 Feb 2010
TL;DR: Sete especies de Punctelia Krog, coletadas nos barrancos e peraus da Serra Geral, regiao central do Rio Grande do Sul, Brasil, sao descritas, ilustradas e comentadas.
Abstract: RESUMO Sete especies de Punctelia Krog, coletadas nos barrancos e peraus da Serra Geral, regiao central do Rio Grande do Sul, Brasil, sao descritas, ilustradas e comentadas. Uma chave para identificacao e fornecida. Pela primeira vez neste genero, e documentada a reacao medular a para-fenilenodiamina. Palavras – Chave: Punctelia, Parmeliaceae, liquens, Brasil, floristica.