Corticolous Myxomycetes I: Two New Species of Didymium

Abstract

SUMMARYThis paper introduces a somewhat distinctive biota, the corticolous Myxomycetes. This biota includes those species growing and fruiting on the bark surface of living trees and vines. Two new plasmodiocarpous species of Didymium are described from the bark of Juniperus spp. Didymium synsporon is characterized by its white, eggshell-like peridium and is the only known species in either Didymum or Diderma in which the spores are adherent in clusters. Didymium orthonemata is distinguished by its rather coarse, upright capillitial threads that seldom anastomose and by its strongly spinulose spores.