New species and interesting records ofArthonialesfrom the Amazon, Rondônia, Brazil

Abstract

AbstractThe following new species ofArthonialesare described from Rondônia:Alyxoria fuscosporawith 3-septate clavate ascospores of 20–23×4·5–5·5 µm having a gelatinous layer soon appearing evenly brown (also known from other tropical countries).Chiodecton complexumwith discrete soralia, immersed apothecia in branched lines and 3-septate ascospores (26–)33–40×2·5–3·5 µm.Coniarthonia rosea,similar toC. pulcherrimabut with the apothecia pink and more irregular in outline and the ascospores 13–16×5·5–6·5 µm.Cresponea flavosorediatawith yellow-olive soralia, apothecia with yellow pruina and 7–9-septate ascospores, 26–38(–50)×5·0–6·5 µm.Cresponea lichenicola, lichenicolous on aPyrenula, with 0·1–0·3 mm wide apothecia with yellow pruina.Eremothecella helicellawith helicoid curvedc.17–29-septate conidiac.70–95×2 µm long if uncoiled, with septa 3–6 µm apart. TheArthonialesare a speciose component of the lowland rainforest of Rondônia. A key is provided to the corticolous species of most groups ofArthonialesfound in Rondônia. The foliicolous species found so far are listed. Most are new records for Rondônia.Chrysothrix occidentalisis new to the Neotropics.