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Acta Botanica Brasilica
Print version ISSN 0102-3306
BARBOSA, Suzana Bissacot and MARCELLI, Marcelo Pinto. Comparative thallus anatomy of two Parmotrema (Parmeliaceae, lichenized Ascomycetes) with reticulate maculae. Acta Bot. Bras. [online]. 2010, vol.24, n.3, pp.803-811. ISSN 0102-3306. http://dx.doi.org/10.1590/S0102-33062010000300023.
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 (Räsänen) 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.
Keywords : anatomy; reticulate maculae; Parmotrema; Rimelia.