A new description of Didymium subreticulosporum is provided that highlights
its unique taxonomic characters-a discontinuous peridial wall, lack of did
ymioid capillitium, and the presence of an irregular membranous structure i
nside the sporotheca, filled with crystals. This species is considered succ
ulenticolous due to its consistent fruiting on Opuntia cladodia in early st
ages of decay and restriction to this microhabitat. Spore dispersal is appa
rently by cactophilic Drosophila flies.