Primer reporte de Irenopsis Melothriae, R.E.D. Baker & W.T. Dale, sobre Melothria Trilobata Cogn., en Venezuela

Abstract

Sample of leaf collected in Urama Carabobo State, Venezuela, was used to study and identify mycological on Melotria trilobata Cong., with the purpose to enter to the collection of the “Albert S. Muller” (VIA) mycological herbarium. Portions of leaves of the host were taken where superficial colonies were observed forming black reticular mycelium. Freehand cuts and prints with transparent tape were made, the tissues stained with lactofucsin and mounted on semipermanent slide. Measurements of the fungal structures were taken with a micrometric ocular coupled to a light microscope. Microscopic observations made it possible to observe mycelium of brown hyphae, sinuous, opposite ramification, with appressors alternating, capitate and unilateral, the basal cell cylindrical, subglobosa to ovate. Opposite phialides, ampuliform, dark brown, globular, scattered perithecia, peritecial setae, light brown, hooked and obtuse, 2 to 7 setae per perithecia, pale brown, ellipsoidal, 4 setae per peritecial, constricted in the walls. The identification was made based on the description of Irenopsis trilobata made by R. E. Baker and W. T. Dale 1951. This species has not been identified in Venezuela, which is the first report for the country.