Caracterización de la biomasa de piña (Ananas comosus) y su elevación en la propagación micelial del hongo shiitake (Lentinula edodes) = Physicochemical characterization of the biomass of the pineapple stubble (Ananas comosus) and its assesment as a substrate for the mycelial propagation of shiitake (Lentinula edodes) mushroom - Vargas-Vargas, Minor Alberto