New Monocentric Eucarpic Operculate Chytrids from Maryland

Summary

Six new species of Karlingia were isolated from soil and water from various parts of Maryland in 1948. Four of these species, K. chitinophila, K. asterocysta, K. curvispinosa, and K. dubia, were isolated and grown on chitinous substrata and are chitinophilic. The other two species, K. lobata and K. marylandia, however, are non-chitinophilic and have been grown only on cellulosic substrata such as onion skin, grass leaves and cellophane. Karlingia chitinophila is strictly endoöperculate, while K. asterocysta, K. curvispinosa, and K. dubia are exoöperculate. On the other hand, K. lobata and K. marylandia are both exo- and endoöperculate.

All of these species have the characteristic type of development and thallus structure of other species of Karlingia, and differ specifically by differences in size of zoospores and character of the resting spores.